JP2000294250A - Copper material for negative electrode current collector of Li-ion battery and Li-ion battery - Google Patents
Copper material for negative electrode current collector of Li-ion battery and Li-ion batteryInfo
- Publication number
- JP2000294250A JP2000294250A JP11100781A JP10078199A JP2000294250A JP 2000294250 A JP2000294250 A JP 2000294250A JP 11100781 A JP11100781 A JP 11100781A JP 10078199 A JP10078199 A JP 10078199A JP 2000294250 A JP2000294250 A JP 2000294250A
- Authority
- JP
- Japan
- Prior art keywords
- negative electrode
- ion battery
- current collector
- copper material
- copper foil
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 title claims abstract description 86
- 239000000463 material Substances 0.000 title claims abstract description 42
- 229910052802 copper Inorganic materials 0.000 title claims abstract description 40
- 239000010949 copper Substances 0.000 title claims abstract description 40
- 229910001416 lithium ion Inorganic materials 0.000 title claims abstract description 33
- 239000011889 copper foil Substances 0.000 claims abstract description 46
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 29
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 24
- 230000002093 peripheral effect Effects 0.000 claims description 6
- 239000005486 organic electrolyte Substances 0.000 claims description 4
- 238000000034 method Methods 0.000 claims description 2
- 239000002023 wood Substances 0.000 claims 1
- 239000010410 layer Substances 0.000 description 16
- SECXISVLQFMRJM-UHFFFAOYSA-N N-Methylpyrrolidone Chemical compound CN1CCCC1=O SECXISVLQFMRJM-UHFFFAOYSA-N 0.000 description 6
- 239000011230 binding agent Substances 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 229910002804 graphite Inorganic materials 0.000 description 4
- 239000010439 graphite Substances 0.000 description 4
- 230000015572 biosynthetic process Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 239000011888 foil Substances 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- 229910012851 LiCoO 2 Inorganic materials 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- 239000002270 dispersing agent Substances 0.000 description 2
- 229910052744 lithium Inorganic materials 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 238000005096 rolling process Methods 0.000 description 2
- 239000002002 slurry Substances 0.000 description 2
- JPVYNHNXODAKFH-UHFFFAOYSA-N Cu2+ Chemical compound [Cu+2] JPVYNHNXODAKFH-UHFFFAOYSA-N 0.000 description 1
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 1
- 229910003307 Ni-Cd Inorganic materials 0.000 description 1
- 229910005813 NiMH Inorganic materials 0.000 description 1
- 239000002033 PVDF binder Substances 0.000 description 1
- 239000002390 adhesive tape Substances 0.000 description 1
- 229910021383 artificial graphite Inorganic materials 0.000 description 1
- 239000000571 coke Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 229910001431 copper ion Inorganic materials 0.000 description 1
- 238000000151 deposition Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 239000008151 electrolyte solution Substances 0.000 description 1
- 238000005530 etching Methods 0.000 description 1
- 230000002687 intercalation Effects 0.000 description 1
- 238000009830 intercalation Methods 0.000 description 1
- 239000011229 interlayer Substances 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 229910000625 lithium cobalt oxide Inorganic materials 0.000 description 1
- BFZPBUKRYWOWDV-UHFFFAOYSA-N lithium;oxido(oxo)cobalt Chemical compound [Li+].[O-][Co]=O BFZPBUKRYWOWDV-UHFFFAOYSA-N 0.000 description 1
- 229910021382 natural graphite Inorganic materials 0.000 description 1
- 239000007773 negative electrode material Substances 0.000 description 1
- 229920002120 photoresistant polymer Polymers 0.000 description 1
- 229920002981 polyvinylidene fluoride Polymers 0.000 description 1
- 230000002250 progressing effect Effects 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 239000013585 weight reducing agent Substances 0.000 description 1
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Landscapes
- Battery Electrode And Active Subsutance (AREA)
- Cell Electrode Carriers And Collectors (AREA)
- Secondary Cells (AREA)
Abstract
(57)【要約】
【課題】 カーボン層との密着性に優れ、単位重量当た
りの出力電流を増大させることのできるＬｉイオン電池
の負極集電体用銅材とこれを使用したＬｉイオン電池を
提供する。
【解決手段】 Ｌｉイオン電池の負極集電体用銅材とし
て、その内径ｄが厚さｔの２倍未満の大きさに形成され
た貫通孔２を有した銅箔１を使用する
(57) [Problem] To provide a copper material for a negative electrode current collector of a Li-ion battery having excellent adhesion to a carbon layer and capable of increasing an output current per unit weight, and a Li-ion battery using the same. provide. SOLUTION: As a copper material for a negative electrode current collector of a Li-ion battery, a copper foil 1 having a through hole 2 whose inner diameter d is formed to be less than twice the thickness t is used.
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、Ｌｉイオン電池の
負極集電体用銅材およびＬｉイオン電池に関し、特に、
カーボン層との密着性に優れ、単位重量当たりの出力電
流を増大させたＬｉイオン電池の負極集電体用銅材とこ
れを使用したＬｉイオン電池に関する。The present invention relates to a copper material for a negative electrode current collector of a Li-ion battery and a Li-ion battery.
The present invention relates to a copper material for a negative electrode current collector of a Li-ion battery which has excellent adhesion to a carbon layer and has an increased output current per unit weight, and a Li-ion battery using the same.
【０００２】[0002]
【従来の技術】単位体積、および単位重量当たりのエネ
ルギー密度において、Ｌｉイオン電池は、他のたとえば
Ｎｉ‐Ｃｄ電池、ＮｉＭＨ電池等に比べて高い性能を有
しており、小型・軽量化が進む携帯用情報機器の電源
（二次電池）としての需要が大きく伸びることが予想さ
れる。2. Description of the Related Art In terms of energy density per unit volume and unit weight, a Li-ion battery has higher performance than other types such as a Ni-Cd battery, a NiMH battery, etc., and the miniaturization and weight reduction are progressing. It is expected that demand for power supplies (secondary batteries) for portable information devices will increase significantly.
【０００３】図３にＬｉイオン電池の概要を示す。Ｌｉ
イオン電池は、正極集電体としてのアルミニウム箔４に
正極としてのコバルト酸リチウム（ＬｉＣｏＯ2 ）５を
形成し、負極集電体としての銅箔１に負極としての黒鉛
等のカーボン層６を形成し、正極５と負極６の間にセパ
レータ７を位置させて円筒形に巻き、これらを有機電解
液８に接触させた構成を有する。FIG. 3 shows an outline of a Li-ion battery. Li
In the ion battery, a lithium cobalt oxide (LiCoO 2 ) 5 as a positive electrode is formed on an aluminum foil 4 as a positive electrode current collector, and a carbon layer 6 such as graphite as a negative electrode is formed on a copper foil 1 as a negative electrode current collector. Then, a separator 7 is positioned between the positive electrode 5 and the negative electrode 6, and the separator 7 is wound in a cylindrical shape, and these are brought into contact with the organic electrolyte 8.
【０００４】Ｌｉイオン電池の充電と放電は、以下のよ
うにして行われる。即ち、充電は、スイッチＳが端子Ｔ
1 にオンしたときに行われ、負極においてＬｉとＣが、
黒鉛層間に原子や原子団をドープした層間化合物ＧＩＣ
（Ｇｒａｐｈｉｔｅ Ｉｎｔｅｒｃａｌａｔｉｏｎ Ｃ
ｏｍｐｏｕｎｄ。このＧＩＣの理論組成はＬｉＣ6 に相
当）を作ることで行われる。一方、放電は、スイッチＳ
が端子Ｔ2 にオンしたときに行われ、黒鉛の負極からＬ
ｉが放出され、これが陽極に取り込まれてＬｉＣｏＯ2
が形成されることによって行われる。図２（ａ）、
（ｂ）はこのＬｉＣ6 の構造を示す。[0004] Charging and discharging of a Li-ion battery are performed as follows. That is, when the switch S is connected to the terminal T
This is performed when the power is turned on to 1. At the negative electrode, Li and C
Interlayer compound GIC doped with atoms and atomic groups between graphite layers
(Graphite Intercalation C
ompound. The theoretical composition of this GIC is equivalent to LiC 6 ). On the other hand, the discharge
There occurs when turned on to the terminal T 2, L from the negative electrode graphite
i is released, and this is taken into the anode and LiCoO 2
Is formed. FIG. 2 (a),
(B) shows the structure of this LiC 6 .
【０００５】負極集電体を構成する銅箔１としては、厚
さが１０μｍ程度のものが使用され、これには、肉厚の
素条から圧延加工した圧延銅箔と、銅イオンを含む電解
液から金属銅を析出させて所定の厚さの箔状体とした電
解銅箔が使用されている。As the copper foil 1 constituting the negative electrode current collector, a copper foil having a thickness of about 10 μm is used. This includes a rolled copper foil rolled from a thick strip and an electrolytic solution containing copper ions. Electrodeposited copper foil is used, which is formed by depositing metallic copper from a liquid to form a foil having a predetermined thickness.
【０００６】これらの銅箔は、前者は表面が不清浄で強
度が高く、後者は表面が清浄で強度が弱いことによって
特徴づけられる。即ち、圧延銅箔の場合には、圧延加工
々程において加工油が不可欠となることから、表面に加
工油が付着して不清浄であり、これに対し後者の電解銅
箔は、加工油の使用を一切必要としないことから表面清
浄である。[0006] These copper foils are characterized by the former having an unclean surface and high strength, and the latter having a clean surface and low strength. That is, in the case of rolled copper foil, since the processing oil is indispensable during the rolling process, the processing oil adheres to the surface and is unclean, whereas the latter electrolytic copper foil is Since no use is required, the surface is clean.
【０００７】しかし、機械的強度の面においては、逆の
評価となり、繰り返しの圧延加工により製造される圧延
銅箔が電解銅箔よりも優れている。いずれの銅箔も、こ
れらの特質に対する個別配慮のもとに負極集電体用銅材
の好適な構成材として使用されている。[0007] However, the mechanical strength is reversed, and the rolled copper foil produced by repeated rolling is superior to the electrolytic copper foil. Any of the copper foils is used as a suitable constituent material of the copper material for the negative electrode current collector in consideration of these characteristics individually.
【０００８】負極を構成するカーボン層６は、平均粒径
が１０数μｍ程度のカーボン粉、人造黒鉛、天然黒鉛、
あるいはコークス等をバインダーとともに溶剤に分散
し、スラリー化した液を塗布した後、これを乾燥するこ
とによって形成され、１００μｍ程度の厚さに形成され
る。通常、バインダーとしてはＰＶｄＦ（ポリ弗化ビニ
リデン）が使用され、分散剤としてはＮＭＰ（Ｎ−メチ
ル−２−ピロリドン）が使用される。The carbon layer 6 constituting the negative electrode has carbon powder having an average particle size of about 10 μm, artificial graphite, natural graphite,
Alternatively, it is formed by dispersing coke and the like together with a binder in a solvent, applying a slurried liquid, and then drying the slurried liquid to a thickness of about 100 μm. Usually, PVdF (polyvinylidene fluoride) is used as a binder, and NMP (N-methyl-2-pyrrolidone) is used as a dispersant.
【０００９】以上のように構成されるＬｉイオン電池の
重要事項として、負極の集電体用銅材を構成する銅箔１
とカーボン層６の密着性、および単位重量当たりの出力
電流が挙げられる。前者は、充放電時の負極からのカー
ボンの脱落とこれを原因とする電極間の短絡、電池容量
の低下、あるいはサイクル特性の低下等を防止するため
の重要項目であり、後者は電池としての基本性能とな
る。[0009] An important matter of the Li-ion battery configured as described above is a copper foil 1 constituting a copper material for a current collector of a negative electrode.
And the carbon layer 6 and the output current per unit weight. The former is an important item to prevent the carbon from dropping from the negative electrode during charge and discharge and to prevent a short circuit between electrodes, a decrease in battery capacity, or a decrease in cycle characteristics due to this, and the latter is an important item for the battery. Basic performance.
【００１０】これらの特性を向上させる手段として、以
下の方法が知られている。即ち、前者については、カー
ボンスラリー中のバインダーの割合を多くすることで改
善が可能であるとされ、一方、後者については、電極の
表面積、特に、集電体を構成する銅箔１の表面積を増加
させることによって改善可能であるとされている。The following methods are known as means for improving these characteristics. That is, the former can be improved by increasing the ratio of the binder in the carbon slurry. On the other hand, the latter can reduce the surface area of the electrode, particularly, the surface area of the copper foil 1 constituting the current collector. It is said that it can be improved by increasing it.
【００１１】[0011]
【発明が解決しようとする課題】しかし、このような従
来の対策によると、前者のバインダーの量を多くする対
策の場合、実際にこれを実施した結果によれば、カーボ
ン粒子間の密着性の向上には効果があるが、負極集電体
用銅材とカーボン層の密着性向上には実質的効果が認め
られない。また、後者の対策にしても、単純に表面積を
大きくしたのでは、電池の重量も増大する結果となり、
単位重量当たりの出力電流の増大には結びつかないた
め、実行が難しい。However, according to such a conventional measure, in the case of the former measure in which the amount of the binder is increased, according to the result of actually implementing this measure, the adhesion between the carbon particles is determined. Although there is an effect on the improvement, no substantial effect is observed on the improvement of the adhesion between the copper material for the negative electrode current collector and the carbon layer. Even in the latter case, simply increasing the surface area results in an increase in the weight of the battery,
It is difficult to execute because it does not lead to an increase in output current per unit weight.
【００１２】従って、本発明の目的は、カーボン層との
密着性に優れ、単位重量当たりの出力電流を増大させる
ことのできるＬｉイオン電池の負極集電体用銅材とこれ
を使用したＬｉイオン電池を提供することにある。Accordingly, an object of the present invention is to provide a copper material for a negative electrode current collector of a Li ion battery, which has excellent adhesion to a carbon layer and can increase the output current per unit weight, and a Li ion using the same. It is to provide a battery.
【００１３】[0013]
【課題を解決するための手段】本発明は、上記の目的を
達成するため、銅箔から構成されるＬｉイオン電池の負
極集電体用銅材において、前記銅箔には、所定の表面積
を有した内周面を有する複数の貫通孔が形成されている
ことを特徴とするＬｉイオン電池の負極集電体用銅材を
提供するものである。In order to achieve the above-mentioned object, the present invention provides a copper material for a negative electrode current collector of a Li-ion battery comprising a copper foil, wherein the copper foil has a predetermined surface area. It is intended to provide a copper material for a negative electrode current collector of a Li-ion battery, wherein a plurality of through holes having an inner peripheral surface are formed.
【００１４】また、本発明は、上記の目的を達成するた
め、集電体用銅材の表面にカーボン層を形成した負極
と、正極と、前記負極および正極の間に位置させられた
セパレータと、前記負極、正極およびセパレータと接触
させられた有機電解液から構成されるＬｉイオン電池に
おいて、前記集電体用銅材は、所定の表面積を有した内
周面を有する複数の貫通孔が形成された銅箔によって構
成されることを特徴とするＬｉイオン電池を提供するも
のである。In order to achieve the above object, the present invention provides a negative electrode having a carbon layer formed on a surface of a copper material for a current collector, a positive electrode, and a separator positioned between the negative electrode and the positive electrode. In the Li-ion battery including the negative electrode, the positive electrode, and the organic electrolyte contacted with the separator, the copper material for the current collector is formed with a plurality of through holes having an inner peripheral surface having a predetermined surface area. It is intended to provide a Li-ion battery characterized by being constituted by a coated copper foil.
【００１５】上記の貫通孔の形状としては、形成の簡便
さから円形であることが好ましく、さらには、正方形、
長方形（矩形）のような四角形であることが好ましい。
貫通孔を円形に形成するときの内径は、内径をｄ、銅箔
の厚さをｔとしたとき、２（ｄ／２）2 π＜ｄｔπの式
を満足することが必要であり、この式を整理すると、ｄ
＜２ｔとなるように、貫通孔の内径は、銅箔の厚さの２
倍未満に設定することが必要となる。The shape of the above-mentioned through-hole is preferably circular for ease of formation.
It is preferably a quadrangle such as a rectangle (rectangle).
When the through hole is formed in a circular shape, it is necessary to satisfy the expression 2 (d / 2) 2 π <dtπ, where d is the inner diameter and t is the thickness of the copper foil. Rearranging, d
<2t, the inner diameter of the through-hole is 2 times the thickness of the copper foil.
It is necessary to set it to less than twice.
【００１６】また、貫通孔を正方形に形成するときに
は、正方形の一辺の長さをａ、銅箔の厚さをｔとしたと
き、２ａ2 ＜４ａｔの式を満足することが必要であり、
この式を整理すると、ａ＜２ｔとなるように、正方形の
一辺の長さを銅箔の厚さの２倍未満に設定することが必
要となる。貫通孔を長方形に形成するときには、長方形
のいずれの一辺も、ａ＜２ｔを満足するように設定すべ
きである。When the through hole is formed in a square, it is necessary to satisfy the following expression: 2a 2 <4 at, where a is the length of one side of the square and t is the thickness of the copper foil.
To summarize this equation, it is necessary to set the length of one side of the square to less than twice the thickness of the copper foil so that a <2t. When the through hole is formed in a rectangular shape, any one side of the rectangular shape should be set so as to satisfy a <2t.
【００１７】貫通孔を以上のように構成する結果、銅箔
の両面における貫通孔の面積は、貫通孔の内周面の表面
積よりも小さなものとなり、従って、この結果、銅箔全
体としての総表面積は、貫通孔を形成しないものに比べ
て大きなものとなる。As a result of configuring the through hole as described above, the area of the through hole on both surfaces of the copper foil is smaller than the surface area of the inner peripheral surface of the through hole. The surface area is larger than that without a through-hole.
【００１８】銅箔は、カーボンを塗布するときの破断等
を防止するために所定の強度を有していることが必要で
あり、狭小すぎるピッチでの貫通孔の形成は避ける必要
がある。この意味から、貫通孔が円形のときの最小ピッ
チは、貫通孔の内径寸法の２倍とすることが好ましく、
また、正方形の貫通孔を形成するときにも、正方形の一
辺の長さの２倍を最小ピッチとして設定することが好ま
しい。It is necessary that the copper foil has a predetermined strength in order to prevent breakage or the like when applying carbon, and it is necessary to avoid formation of through holes at a pitch that is too narrow. In this sense, the minimum pitch when the through hole is circular is preferably set to twice the inner diameter of the through hole,
Also, when forming a square through hole, it is preferable to set the minimum pitch to twice the length of one side of the square.
【００１９】円形および正方形のいずれの貫通孔も、そ
の内径あるいは一辺の長さの１０倍を超えるピッチでの
形成は好ましくない。１０倍を超えて形成するときに
は、総表面積の増大化効果に充分なものが得にくくなる
ので、避けるべきである。なお、本発明においては、貫
通孔の数に特に制約はなく、銅箔の強度の許す範囲内に
おいてできるだけ多数形成することが好ましい。It is not preferable to form both the circular and square through holes at a pitch exceeding 10 times the inner diameter or the length of one side. If it is formed more than 10 times, it is difficult to obtain a sufficient effect for increasing the total surface area, and therefore it should be avoided. In the present invention, the number of through holes is not particularly limited, and it is preferable to form as many as possible as long as the strength of the copper foil allows.
【００２０】[0020]
【発明の実施の形態】次に、本発明によるＬｉイオン電
池の負極集電体用銅材およびＬｉイオン電池の実施の形
態を説明する。Next, an embodiment of a copper material for a negative electrode current collector of a Li-ion battery and a Li-ion battery according to the present invention will be described.
【００２１】[0021]
【実施例】幅２１０ｍｍ、長さ２９７ｍｍ、および厚さ
２０μｍの圧延銅箔にフォトレジストを塗布し、これ
に、所定の形状、大きさ、ピッチの孔を有するマスクに
基づいた露光と現像を施した後、エッチング処理を施す
ことによって各実施例の負極集電体用銅材を製造した。
貫通孔は、銅箔の幅方向および長さ方向に同じピッチで
形成した。EXAMPLE A rolled copper foil having a width of 210 mm, a length of 297 mm, and a thickness of 20 μm was coated with a photoresist, and exposed and developed based on a mask having holes of a predetermined shape, size and pitch. After that, the copper material for a negative electrode current collector of each example was manufactured by performing an etching treatment.
The through holes were formed at the same pitch in the width direction and the length direction of the copper foil.
【００２２】一方、カーボンとＰＶｄＦの重量比を９
５：５に設定し、分散剤としてＮＭＰを使用したカーボ
ンスラリーを準備して、これを各実施例の負極集電体用
銅材に塗布し、乾燥することにより各実施例に基づく負
極用構成材をそれぞれ製作した。On the other hand, the weight ratio of carbon to PVdF is 9
5: 5, a carbon slurry using NMP as a dispersant was prepared, applied to the copper material for a negative electrode current collector of each example, and dried to form a negative electrode composition based on each example. Materials were manufactured respectively.
【００２３】図１は、この実施例において、貫通孔を円
形に形成した銅箔の断面を示したもので、１は銅箔、２
はこの銅箔１に形成された貫通孔を示し、その内径ｄ
は、銅箔１の厚さｔの２倍未満の大きさに形成されてい
る。FIG. 1 shows a cross section of a copper foil in which a through hole is formed in a circle in this embodiment.
Indicates a through hole formed in the copper foil 1, and its inner diameter d
Is formed in a size of less than twice the thickness t of the copper foil 1.
【００２４】図２は、この実施例において、貫通孔を正
方形に形成した銅箔の断面構造を示す。図２（ａ）に示
される正方形の貫通孔３の一片の長さａは、図２（ｂ）
に示す銅箔１の厚さｔの２倍未満の寸法に形成されてい
る。FIG. 2 shows a cross-sectional structure of a copper foil having a square through hole in this embodiment. The length a of one piece of the square through hole 3 shown in FIG.
Is smaller than twice the thickness t of the copper foil 1 shown in FIG.
【００２５】表１は、各実施例の負極集電体用銅材の構
成と、これを使用した負極材に対する試験結果をまとめ
たものである。試験は、銅材とカーボン層の密着強度を
測定することによって行われ、幅５０ｍｍの粘着テープ
をカーボン層に貼り付け、このテープを１ｍｍ／分の速
度で９０°方向に引っ張ったときの、銅材とカーボン層
が剥離するときの最大引張強度を密着強度とした。従来
例としては、厚さ２０μｍｍの圧延銅箔を使用した。Table 1 summarizes the structure of the copper material for a negative electrode current collector of each embodiment and the test results for the negative electrode material using the same. The test was performed by measuring the adhesion strength between the copper material and the carbon layer. A 50 mm wide adhesive tape was attached to the carbon layer, and the tape was pulled in a 90 ° direction at a speed of 1 mm / min. The maximum tensile strength when the material and the carbon layer peeled off was defined as the adhesion strength. As a conventional example, a rolled copper foil having a thickness of 20 μm was used.
【００２６】[0026]
【表１】 [Table 1]
【００２７】表１によれば、貫通孔のない従来例の密着
強度（／ｋｇｆｍｍ-1）が８．２であるのに対し、実施
例１〜４は１２．０〜１３．２と格段に高い密着強度を
示しており、本発明の効果が如実に現れている。なお、
参考例１は、円形の貫通孔２の内径ｄを銅箔１の厚さｔ
の２倍以上に設定した例であり、参考例２は、正方形の
貫通孔３の一辺の長さａを銅箔１の厚さｔの２倍以上に
設定した例であるが、いずれも従来例と同レベルの密着
強度しか得られていない。According to Table 1, while the adhesion strength (/ kgfmm -1 ) of the conventional example having no through hole is 8.2, Examples 1 to 4 are much higher, 12.0 to 13.2. It shows high adhesion strength, and the effects of the present invention are clearly shown. In addition,
In Reference Example 1, the inner diameter d of the circular through hole 2 is determined by the thickness t of the copper foil 1.
Reference Example 2 is an example in which the length a of one side of the square through-hole 3 is set to be at least twice the thickness t of the copper foil 1, but in each case, Only the same level of adhesion strength as in the example was obtained.
【００２８】次に、貫通孔の形成ピッチと銅箔の厚さの
関係を解析した結果を示す。表２は、円形の貫通孔２を
形成した集電体用銅材において、形成された貫通孔２の
形成ピッチがおよぼす、銅材の引張強度と銅材とカーボ
ン層の密着強度への影響を示したものである。Next, the results of analysis of the relationship between the pitch of the through holes and the thickness of the copper foil are shown. Table 2 shows the influence of the pitch of the formed through holes 2 on the tensile strength of the copper material and the adhesion strength between the copper material and the carbon layer in the copper material for the current collector having the circular through holes 2 formed therein. It is shown.
【００２９】[0029]
【表２】 [Table 2]
【００３０】表２によれば、実施例が引張強度と密着強
度の双方において良好な結果を示しているのに対し、参
考例３は、貫通孔２の形成ピッチが貫通孔２の内径ｄの
２倍未満に設定されているため引張強度に劣り、また、
参考例４においても、貫通孔２の形成ピッチが貫通孔２
の内径ｄの１０倍を超えて設定されているためカーボン
層との密着強度に充分なものが得られていない。According to Table 2, the Example shows good results in both tensile strength and adhesion strength, whereas Reference Example 3 shows that the pitch of the through holes 2 is smaller than the inner diameter d of the through holes 2. Inferior in tensile strength because it is set to less than twice,
Also in Reference Example 4, the formation pitch of the through holes 2 is
Is set to be more than 10 times the inner diameter d of the above, and a material having a sufficient adhesion strength with the carbon layer has not been obtained.
【００３１】表１および表２に示された実施例１〜６に
よる負極集電体用銅材が、従来例よりも大きな総表面積
を有していることは、貫通孔２、３の寸法ｄ、ａと銅箔
１の厚さｔの関係から明白であり、さらに、実施例１〜
６による集電体用銅材が従来例よりも軽量であること
も、貫通孔２、３の存在からして明白である。The fact that the copper materials for negative electrode current collectors according to Examples 1 to 6 shown in Tables 1 and 2 have a larger total surface area than that of the conventional example means that the through holes 2 and 3 have the dimension d. , A and the thickness t of the copper foil 1 are clear.
It is also evident from the presence of the through holes 2 and 3 that the current collector copper material 6 is lighter than the conventional example.
【００３２】従って、実施例１〜６の集電体用銅材を負
極に使用したＬｉイオン電池は、負極からのカーボン層
の脱落が起こりにくいとともに、単位重量当たりの出力
電流において従来のＬｉイオン電池よりも増大すること
になり、電源電池としての基本機能において優れた性能
を発揮することができる。Therefore, the Li-ion batteries using the copper material for a current collector of Examples 1 to 6 for the negative electrode are unlikely to cause the carbon layer to fall off from the negative electrode, and have a low output current per unit weight. It is larger than a battery, and can exhibit excellent performance in a basic function as a power supply battery.
【００３３】[0033]
【発明の効果】以上のように、本発明によるＬｉイオン
電池の負極集電体用銅材およびこれを使用したＬｉイオ
ン電池によれば、所定の表面積を有した内周面を有する
複数の貫通孔を銅箔に形成し、この銅箔を負極集電体用
銅材として使用するので、負極集電体用銅材の表面積が
増大することになり、従って、集電体用銅材とカーボン
層との密着強度を向上させることができるとともに、貫
通孔の形成による電池重量の低減が可能となるために単
位重量当たりの出力電流を増大させることができ、全体
として性能の高いＬｉイオン電池を提供することができ
る。As described above, according to the copper material for a negative electrode current collector of a Li-ion battery and the Li-ion battery using the same according to the present invention, a plurality of through-holes having an inner peripheral surface having a predetermined surface area are provided. Since the holes are formed in the copper foil and this copper foil is used as the copper material for the negative electrode current collector, the surface area of the copper material for the negative electrode current collector increases, and therefore, the copper material for the current collector and the carbon In addition to improving the adhesion strength with the layer, the output current per unit weight can be increased because the weight of the battery can be reduced by forming the through-holes. Can be provided.
【図１】本発明によるＬｉイオン電池の負極集電体用銅
材の実施の形態における銅箔の断面構造を示す説明図。FIG. 1 is an explanatory diagram showing a cross-sectional structure of a copper foil in an embodiment of a copper material for a negative electrode current collector of a Li-ion battery according to the present invention.
【図２】本発明によるＬｉイオン電池の負極集電体用銅
材の他の実施の形態における銅箔の構造を示す説明図。FIG. 2 is an explanatory view showing a structure of a copper foil in another embodiment of the copper material for a negative electrode current collector of a Li-ion battery according to the present invention.
【図３】Ｌｉイオン電池の説明図。FIG. 3 is an explanatory diagram of a Li-ion battery.
【図４】ＬｉＣ6 の構造図。FIG. 4 is a structural diagram of LiC 6 .
１ 銅箔 ２、３ 貫通孔 ４ アルミニウム箔 ５ コバルト酸リチウム ６ カーボン層 ７ セパレータ ８ 有機電解液 Ｓ スイッチ DESCRIPTION OF SYMBOLS 1 Copper foil 2, 3 Through-hole 4 Aluminum foil 5 Lithium cobaltate 6 Carbon layer 7 Separator 8 Organic electrolyte S switch
───────────────────────────────────────────────────── フロントページの続き Ｆターム(参考） 5H014 AA04 CC01 EE05 EE07 HH01 HH06 5H017 AA03 AS10 CC01 DD05 DD08 EE01 EE08 HH01 HH03 5H029 AJ06 AK03 AL06 AM02 BJ14 DJ07 DJ08 DJ14 EJ01 EJ04 HJ04 HJ05 HJ06 ──────────────────────────────────────────────────続 き Continued on front page F term (reference) 5H014 AA04 CC01 EE05 EE07 HH01 HH06 5H017 AA03 AS10 CC01 DD05 DD08 EE01 EE08 HH01 HH03 5H029 AJ06 AK03 AL06 AM02 BJ14 DJ07 DJ08 DJ14 EJ01 EJ04 HJ04 HJ05 HJ
Claims (6)
集電体用銅材において、 前記銅箔には、所定の表面積を有した内周面を有する複
数の貫通孔が形成されていることを特徴とするＬｉイオ
ン電池の負極集電体用銅材。1. A copper material for a negative electrode current collector of a Li-ion battery comprising a copper foil, wherein the copper foil has a plurality of through holes having an inner peripheral surface having a predetermined surface area. A copper material for a negative electrode current collector of a Li-ion battery, comprising:
の厚さの２倍未満の内径を有することを特徴とする請求
項１項記載のＬｉイオン電池の負極集電体用銅材。2. The copper for a negative electrode current collector of a Li-ion battery according to claim 1, wherein the through-hole is formed in a circular shape and has an inner diameter less than twice the thickness of the copper foil. Wood.
ッチで形成されることを特徴とする請求項２項記載のＬ
ｉイオン電池の負極集電体用銅材。3. The L according to claim 2, wherein the through holes are formed at a pitch of 2 to 10 times the inner diameter.
Copper material for negative electrode current collector of i-ion battery.
角形のいずれの一辺も前記銅箔の厚さの２倍未満に設定
されることを特徴とする請求項１項記載のＬｉイオン電
池の負極集電体用銅材。4. The Li-ion battery according to claim 1, wherein the through-hole is formed in a square shape, and each side of the square is set to be less than twice the thickness of the copper foil. Copper material for negative electrode current collector.
０倍のピッチで形成されることを特徴とする請求項４項
記載のＬｉ電池の負極集電体用銅材。5. A method according to claim 1, wherein said through hole is formed in one side of said square.
The copper material for a negative electrode current collector of a Li battery according to claim 4, wherein the copper material is formed at a pitch of 0 times.
た負極と、正極と、前記負極および正極の間に位置させ
られたセパレータと、前記負極、正極およびセパレータ
と接触させられた有機電解液から構成されるＬｉイオン
電池において、 前記集電体用銅材は、所定の表面積を有した内周面を有
する複数の貫通孔が形成された銅箔によって構成される
ことを特徴とするＬｉイオン電池。6. A negative electrode having a carbon layer formed on the surface of a current collector copper material, a positive electrode, a separator positioned between the negative electrode and the positive electrode, and contacted with the negative electrode, the positive electrode, and the separator. In a Li-ion battery including an organic electrolyte, the current collector copper material is configured by a copper foil in which a plurality of through holes having an inner peripheral surface having a predetermined surface area are formed. Li-ion battery.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11100781A JP2000294250A (en) | 1999-04-08 | 1999-04-08 | Copper material for negative electrode current collector of Li-ion battery and Li-ion battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11100781A JP2000294250A (en) | 1999-04-08 | 1999-04-08 | Copper material for negative electrode current collector of Li-ion battery and Li-ion battery |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2000294250A true JP2000294250A (en) | 2000-10-20 |
Family
ID=14283017
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11100781A Pending JP2000294250A (en) | 1999-04-08 | 1999-04-08 | Copper material for negative electrode current collector of Li-ion battery and Li-ion battery |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2000294250A (en) |
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2001029912A1 (en) * | 1999-10-22 | 2001-04-26 | Sanyo Electric Co., Ltd. | Electrode for lithium cell and lithium secondary cell |
| WO2001031723A1 (en) * | 1999-10-22 | 2001-05-03 | Sanyo Electric Co., Ltd. | Electrode for lithium secondary cell and lithium secondary cell |
| JP2003051313A (en) * | 2001-08-07 | 2003-02-21 | Matsushita Electric Ind Co Ltd | Method of manufacturing secondary battery and secondary battery |
| US7122279B2 (en) | 2000-04-26 | 2006-10-17 | Sanyo Electric Co., Ltd. | Electrode for rechargeable lithium battery and rechargeable lithium battery |
| US7195842B1 (en) | 1999-10-22 | 2007-03-27 | Sanyo Electric Co., Ltd. | Electrode for use in lithium battery and rechargeable lithium battery |
| US7241533B1 (en) | 1999-10-22 | 2007-07-10 | Sanyo Electric Co., Ltd. | Electrode for rechargeable lithium battery and rechargeable lithium battery |
| US7410728B1 (en) | 1999-10-22 | 2008-08-12 | Sanyo Electric Co., Ltd. | Electrode for lithium batteries and rechargeable lithium battery |
| WO2011108467A1 (en) | 2010-03-01 | 2011-09-09 | 古河電気工業株式会社 | Surface treatment method for copper foil, surface treated copper foil and copper foil for negative electrode collector of lithium ion secondary battery |
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| CN109494374A (en) * | 2018-11-12 | 2019-03-19 | 桑顿新能源科技有限公司 | Lithium ion battery silicon-carbon cathode piece and preparation method thereof |
| JP2023523740A (en) * | 2020-04-29 | 2023-06-07 | ヴァルタ マイクロバッテリー ゲゼルシャフト ミット ベシュレンクテル ハフツング | Lithium ion secondary electrochemical cell |
-
1999
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|---|---|---|---|---|
| US7794881B1 (en) | 1999-10-22 | 2010-09-14 | Sanyo Electric Co., Ltd. | Electrode for lithium batteries and rechargeable lithium battery |
| US7241533B1 (en) | 1999-10-22 | 2007-07-10 | Sanyo Electric Co., Ltd. | Electrode for rechargeable lithium battery and rechargeable lithium battery |
| US7410728B1 (en) | 1999-10-22 | 2008-08-12 | Sanyo Electric Co., Ltd. | Electrode for lithium batteries and rechargeable lithium battery |
| WO2001029912A1 (en) * | 1999-10-22 | 2001-04-26 | Sanyo Electric Co., Ltd. | Electrode for lithium cell and lithium secondary cell |
| US7192673B1 (en) | 1999-10-22 | 2007-03-20 | Sanyo Electric Co., Ltd. | Electrode for rechargeable lithium battery and rechargeable lithium battery |
| US7195842B1 (en) | 1999-10-22 | 2007-03-27 | Sanyo Electric Co., Ltd. | Electrode for use in lithium battery and rechargeable lithium battery |
| WO2001031723A1 (en) * | 1999-10-22 | 2001-05-03 | Sanyo Electric Co., Ltd. | Electrode for lithium secondary cell and lithium secondary cell |
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| US7122279B2 (en) | 2000-04-26 | 2006-10-17 | Sanyo Electric Co., Ltd. | Electrode for rechargeable lithium battery and rechargeable lithium battery |
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| WO2011108467A1 (en) | 2010-03-01 | 2011-09-09 | 古河電気工業株式会社 | Surface treatment method for copper foil, surface treated copper foil and copper foil for negative electrode collector of lithium ion secondary battery |
| KR20160039732A (en) * | 2014-10-01 | 2016-04-12 | 에스케이이노베이션 주식회사 | Current collector for electrode of secondary battery |
| KR102275363B1 (en) * | 2014-10-01 | 2021-07-09 | 에스케이이노베이션 주식회사 | Current collector for electrode of secondary battery |
| CN109494374A (en) * | 2018-11-12 | 2019-03-19 | 桑顿新能源科技有限公司 | Lithium ion battery silicon-carbon cathode piece and preparation method thereof |
| JP2023523740A (en) * | 2020-04-29 | 2023-06-07 | ヴァルタ マイクロバッテリー ゲゼルシャフト ミット ベシュレンクテル ハフツング | Lithium ion secondary electrochemical cell |
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