JPH02155162A - Storage battery - Google Patents

Storage battery

Info

Publication number
JPH02155162A
JPH02155162A JP63308348A JP30834888A JPH02155162A JP H02155162 A JPH02155162 A JP H02155162A JP 63308348 A JP63308348 A JP 63308348A JP 30834888 A JP30834888 A JP 30834888A JP H02155162 A JPH02155162 A JP H02155162A
Authority
JP
Japan
Prior art keywords
electrode
aluminium
lithium
target
storage battery
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
Application number
JP63308348A
Other languages
Japanese (ja)
Inventor
Takeshi Miyabayashi
毅 宮林
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Brother Industries Ltd
Original Assignee
Brother Industries Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Brother Industries Ltd filed Critical Brother Industries Ltd
Priority to JP63308348A priority Critical patent/JPH02155162A/en
Publication of JPH02155162A publication Critical patent/JPH02155162A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/36—Selection of substances as active materials, active masses, active liquids
    • H01M4/38—Selection of substances as active materials, active masses, active liquids of elements or alloys
    • H01M4/40—Alloys based on alkali metals
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/36—Selection of substances as active materials, active masses, active liquids
    • H01M4/38—Selection of substances as active materials, active masses, active liquids of elements or alloys
    • H01M4/40—Alloys based on alkali metals
    • H01M4/405—Alloys based on lithium
    • 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

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Battery Electrode And Active Subsutance (AREA)

Abstract

PURPOSE:To keep electromotive force constant by changing electrode film components in the direction of film thickness. CONSTITUTION:The film components of an alloy electrode 204 are changed in the direction of film thickness in consideration with the change in the electrode surface condition attendant on discharge. For example, when lithium and aluminium are sputtered on a current collector 201, the revolution speed of a motor 22 is changed with sputtering time to change the holding time of the current collector 201 on a lithium target 20 and an aluminium target 21. In the initial stage of sputtering, the holding time of the current collector 201 on the lithium target 20 is lengthened and that on the aluminium target 21 is lengthened with time elapsed to form a lithium-aluminium alloy electrode 204 in which aluminium concentration is gradually decreased from the surface. The electromotive force of a storage battery is kept constant over the period of use without drop in energy efficiency.

Description

【発明の詳細な説明】 ［産業上の利用分野］ 本発明は、蓄電池に関するものである。[Detailed description of the invention] [Industrial application field] The present invention relates to storage batteries.

［従来技術］ 従来の蓄電池の起電力は陽陰極物質の酸化還元電位の差
によってその最大値が決まり、放電量の増加と共に起電
力は低下した。[Prior Art] The maximum value of the electromotive force of a conventional storage battery is determined by the difference in oxidation-reduction potential of the anode and cathode materials, and the electromotive force decreases as the amount of discharge increases.

［発明が解決しようとする課題］ しかしながら、近年高速演算機能を有するＣＰＵ及びそ
の周辺部に用いられるゲートアレイ等は、より高速のク
ロック信号を基準に駆動されるようになってきており、
その結果駆動電源電圧に関する要求においても許容範囲
が狭くなってきている。[Problems to be Solved by the Invention] However, in recent years, CPUs with high-speed calculation functions and gate arrays used in their peripheral parts have come to be driven based on faster clock signals.
As a result, the tolerance range for requirements regarding drive power supply voltage is becoming narrower.

しかしながらポータプル機器等における駆動源である蓄
電池は、先に述べた起電力の低下現象を回避できず、昇
圧回路、定圧凹路等の制御回路が必要となり、エネルギ
ー効率の低下及び回路費用が増加した。However, storage batteries, which are the driving source for portable equipment, cannot avoid the phenomenon of the electromotive force drop mentioned earlier, and control circuits such as booster circuits and constant pressure concave circuits are required, resulting in a decrease in energy efficiency and an increase in circuit costs. .

［発明の目的］ 本発明は、上述した問題点を解決するためになされたも
のであり、蓄電池の起電力を使用期間中一定とすること
を可能にした蓄電池を提供することにある。[Object of the Invention] The present invention was made to solve the above-mentioned problems, and an object of the present invention is to provide a storage battery that makes it possible to keep the electromotive force of the storage battery constant during the period of use.

［課題を解決するための手段］ この目的を達成するために本発明の蓄電池は、電極被膜
組成を膜厚方向に変化させた。[Means for Solving the Problems] In order to achieve this object, in the storage battery of the present invention, the composition of the electrode coating is changed in the film thickness direction.

「作用」 それにより、起電力を一定にすることができた。"action" This made it possible to keep the electromotive force constant.

［実施例］ 以下、本発明を具体化した一実施例を図面を参照して説
明する。[Example] Hereinafter, an example embodying the present invention will be described with reference to the drawings.

第１図に本発明の蓄電池の構造を示す。即ち、蓄電池２
００は、上下の集電体２０１間にＶＩＳＯ４３を正極活
用物質とするコンポジット陽極２０２と、ポリマー電解
質２０３と、Ｌ　ｉ　−Ａ４の合金負極２０４とから構
成されている。ここでＬｉ蓄電池の起電力低下を補うた
めに、合金負極２０４はその膜の深さ方向にアルミニウ
ムの濃度を減少させである。　次に本発明の原理及び作
用を説明する。第２図は、典型的なＬｉ２次電池のＡｇ
濃度が高い状態の合金負極２０４の電極反応（１）と、
Ａｌ濃度が低い状態の合金負極２０４の電極反応（２）
及び正極２０２の電極反応（３）と、各々の電極での電
流電位曲線を示したものである。FIG. 1 shows the structure of the storage battery of the present invention. That is, storage battery 2
00 is composed of a composite anode 202 using VISO43 as a positive electrode material between upper and lower current collectors 201, a polymer electrolyte 203, and a Li-A4 alloy negative electrode 204. Here, in order to compensate for the decrease in electromotive force of the Li storage battery, the alloy negative electrode 204 has a reduced aluminum concentration in the depth direction of its film. Next, the principle and operation of the present invention will be explained. Figure 2 shows the Ag of a typical Li secondary battery.
Electrode reaction (1) of the alloy negative electrode 204 in a high concentration state,
Electrode reaction of alloy negative electrode 204 with low Al concentration (2)
3 shows electrode reaction (3) of the positive electrode 202 and current-potential curves at each electrode.

Ｅｌ　ｒ　　Ｅ２　ｒ　　Ｅｌは、夫々電極反応（１）
、　　（２）（３）の酸化還元電位のレベルを示してい
る。El r E2 r El are respectively electrode reactions (1)
, (2) shows the level of redox potential of (3).

ここで蓄電池を定電流（１）で放電を行なうと、正負両
極２０２，２０４は実線■のように分極され、極間電圧
は△Ｅ１となる。しかしながら、放電が進むと電極の表
面状態が変化して、分極状態は破線■で示すようになり
、極間電圧はΔＥ、となり低下する。そこでこの起電力
低下を防止するため合金電極２０４を使用している負極
の被膜組成をリチウムリッチ即ちＡｌａ度の低い状態に
してやると、負極の分極状態は一点鎖線■で示す状態に
なり、極間電圧は△Ｅ　と増加する。即ち、放？ｌｉ量
の増加に伴う電極表面状態の変化考慮して合金電極２０
４の被膜組成を膜の深さ方向に変化させてやれば、起電
力を一定にすることができる。When the storage battery is discharged at a constant current (1), both the positive and negative poles 202, 204 are polarized as shown by the solid line ■, and the interelectrode voltage becomes ΔE1. However, as the discharge progresses, the surface state of the electrode changes, the polarization state becomes as shown by the broken line ■, and the electrode-to-electrode voltage becomes ΔE and decreases. Therefore, in order to prevent this reduction in electromotive force, if the coating composition of the negative electrode using the alloy electrode 204 is made rich in lithium, that is, the degree of Ala is low, the polarization state of the negative electrode becomes the state shown by the dashed line ■, and the gap between the electrodes becomes The voltage increases as △E. In other words, release? Alloy electrode 20 was developed in consideration of changes in the electrode surface state as the amount of li increased.
By changing the coating composition of No. 4 in the depth direction of the film, the electromotive force can be made constant.

合金電極２０４中のアルミニウム濃度を制御する方法と
してして、第３図に示すように、集電体２０１上にＬｉ
、Ａ７をスパッタするに当り、スパッタ時間と共にモー
タ２２の回転速度を変化させてＬｉターゲット２０及び
ＡＡツタ−ット２１上での集電体２０１の保持時間を変
化させてＬｉ−Ａｄ合金電極２０４を形成した。即ち、
スパッタ開始初期は、ＬＬＬｉ−ゲット２０での集電体
２０１の保持時間を長くすると共に、時間の経過に伴っ
てへ！ターゲット２１上での保持間を増加させることに
より、表面より徐々にＡｇ濃度が減少するＬ　ｉ−Ａ［
合金電極２０４を形成することができる。As a method of controlling the aluminum concentration in the alloy electrode 204, as shown in FIG.
, A7, the rotational speed of the motor 22 is changed with the sputtering time to change the holding time of the current collector 201 on the Li target 20 and the AA target 21, and the Li-Ad alloy electrode 204 is sputtered. was formed. That is,
At the beginning of sputtering, the holding time of the current collector 201 in the LLLi-get 20 is lengthened, and as time passes, the current collector 201 is held longer. By increasing the holding time on the target 21, the Ag concentration gradually decreases from the surface.
An alloy electrode 204 can be formed.

［発明の効果］ 以上詳述したことから明らかなように、本発明によれば
、蓄電池の起電力をエネルギー使用効率を低下させるこ
となく使用期間中一定とすることが可能にできる。[Effects of the Invention] As is clear from the detailed description above, according to the present invention, it is possible to keep the electromotive force of the storage battery constant during the period of use without reducing the energy use efficiency.

【図面の簡単な説明】[Brief explanation of the drawing]

第１図は本発明の蓄電池を示す図、第２図は、電極反応
とその電流電位曲線を示す図、第３図は合金電極の製造
装置を示す図である。 図中、２００は蓄電池、２０２は正極、２０４は合金負
極である。FIG. 1 is a diagram showing a storage battery of the present invention, FIG. 2 is a diagram showing an electrode reaction and its current-potential curve, and FIG. 3 is a diagram showing an apparatus for manufacturing an alloy electrode. In the figure, 200 is a storage battery, 202 is a positive electrode, and 204 is an alloy negative electrode.

Claims (1)

【特許請求の範囲】[Claims] 電極の被膜組成を膜厚方向に変化させた電極を具備する
ことを特徴とする蓄電池。A storage battery characterized by comprising an electrode in which the coating composition of the electrode is changed in the film thickness direction.
JP63308348A 1988-12-06 1988-12-06 Storage battery Pending JPH02155162A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP63308348A JPH02155162A (en) 1988-12-06 1988-12-06 Storage battery

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP63308348A JPH02155162A (en) 1988-12-06 1988-12-06 Storage battery

Publications (1)

Publication Number Publication Date
JPH02155162A true JPH02155162A (en) 1990-06-14

Family

ID=17979980

Family Applications (1)

Application Number Title Priority Date Filing Date
JP63308348A Pending JPH02155162A (en) 1988-12-06 1988-12-06 Storage battery

Country Status (1)

Country Link
JP (1) JPH02155162A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0865513A4 (en) * 1995-12-05 2001-02-21 Minnesota Mining & Mfg SPLUTTERING LITHIUM
US8273136B2 (en) * 2007-03-16 2012-09-25 Panasonic Corporation Electrochemical element, and method and apparatus for manufacturing electrode thereof
US20130330617A1 (en) * 2011-02-21 2013-12-12 Japan Capacitor Industrial Co., Ltd. Electrode foil, current collector, electrode, and electric energy storage element using same
US9581875B2 (en) 2005-02-23 2017-02-28 Sage Electrochromics, Inc. Electrochromic devices and methods

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0865513A4 (en) * 1995-12-05 2001-02-21 Minnesota Mining & Mfg SPLUTTERING LITHIUM
US9581875B2 (en) 2005-02-23 2017-02-28 Sage Electrochromics, Inc. Electrochromic devices and methods
US10061174B2 (en) 2005-02-23 2018-08-28 Sage Electrochromics, Inc. Electrochromic devices and methods
US11567383B2 (en) 2005-02-23 2023-01-31 Sage Electrochromics, Inc. Electrochromic devices and methods
US8273136B2 (en) * 2007-03-16 2012-09-25 Panasonic Corporation Electrochemical element, and method and apparatus for manufacturing electrode thereof
US20130330617A1 (en) * 2011-02-21 2013-12-12 Japan Capacitor Industrial Co., Ltd. Electrode foil, current collector, electrode, and electric energy storage element using same
US9418796B2 (en) * 2011-02-21 2016-08-16 Japan Capacitor Industrial Co., Ltd. Electrode foil, current collector, electrode, and electric energy storage element using same

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