JPH03141553A - Manufacture of flat battery positive electrode body - Google Patents
Manufacture of flat battery positive electrode bodyInfo
- Publication number
- JPH03141553A JPH03141553A JP27846389A JP27846389A JPH03141553A JP H03141553 A JPH03141553 A JP H03141553A JP 27846389 A JP27846389 A JP 27846389A JP 27846389 A JP27846389 A JP 27846389A JP H03141553 A JPH03141553 A JP H03141553A
- Authority
- JP
- Japan
- Prior art keywords
- positive electrode
- paste
- electrode body
- stirring
- flat 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
Links
- 238000004519 manufacturing process Methods 0.000 title claims description 13
- 239000000203 mixture Substances 0.000 claims abstract description 30
- 238000003756 stirring Methods 0.000 claims abstract description 17
- 238000002156 mixing Methods 0.000 claims abstract description 5
- 239000011347 resin Substances 0.000 claims abstract description 4
- 229920005989 resin Polymers 0.000 claims abstract description 4
- 238000000034 method Methods 0.000 claims description 9
- 239000011230 binding agent Substances 0.000 claims description 5
- 239000002562 thickening agent Substances 0.000 claims description 4
- 239000004020 conductor Substances 0.000 claims description 3
- 229910052751 metal Inorganic materials 0.000 claims description 3
- 239000002184 metal Substances 0.000 claims description 3
- 239000007774 positive electrode material Substances 0.000 claims description 3
- 239000002904 solvent Substances 0.000 claims description 2
- 239000008188 pellet Substances 0.000 abstract description 9
- 229920001343 polytetrafluoroethylene Polymers 0.000 abstract description 9
- 239000004810 polytetrafluoroethylene Substances 0.000 abstract description 9
- 229920002125 Sokalan® Polymers 0.000 abstract description 5
- 239000004584 polyacrylic acid Substances 0.000 abstract description 4
- -1 polyethylene Polymers 0.000 abstract description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 abstract description 2
- 239000006185 dispersion Substances 0.000 abstract description 2
- 238000001035 drying Methods 0.000 abstract description 2
- 229910002804 graphite Inorganic materials 0.000 abstract description 2
- 239000010439 graphite Substances 0.000 abstract description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 2
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 abstract 1
- 239000004698 Polyethylene Substances 0.000 abstract 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 abstract 1
- 230000015572 biosynthetic process Effects 0.000 abstract 1
- 239000000314 lubricant Substances 0.000 abstract 1
- 229920000573 polyethylene Polymers 0.000 abstract 1
- 229910052710 silicon Inorganic materials 0.000 abstract 1
- 239000010703 silicon Substances 0.000 abstract 1
- 230000000052 comparative effect Effects 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 239000000835 fiber Substances 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- NUJOXMJBOLGQSY-UHFFFAOYSA-N manganese dioxide Chemical compound O=[Mn]=O NUJOXMJBOLGQSY-UHFFFAOYSA-N 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 238000004062 sedimentation Methods 0.000 description 2
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 229910052744 lithium Inorganic materials 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000011812 mixed powder Substances 0.000 description 1
- 238000007650 screen-printing Methods 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
Classifications
-
- Y02E60/12—
Landscapes
- Battery Electrode And Active Subsutance (AREA)
Abstract
Description
【発明の詳細な説明】
【発明の目的〕
（産業上の利用分野）
本発明は扁平形電池の正極体の製造法に関するものであ
る。特に１關以下の厚さの正極体の製造法に関する。DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Field of Application) The present invention relates to a method for manufacturing a positive electrode body for a flat battery. In particular, the present invention relates to a method for manufacturing a positive electrode body having a thickness of one inch or less.
（従来の技術）
近年、薄型電子機器例えば薄型ラジオ、薄型電卓などの
発達により、その電源として用いる電池も薄型化が進ん
できている。(Prior Art) In recent years, with the development of thin electronic devices such as thin radios and thin calculators, the batteries used as their power sources have also become thinner.
ところで、厚さがｌｕｓ以下の扁平形電池に用いられる
正極体の製造法としては、まづ正極活物質と導電材の混
合粉末をフッ素樹脂粉末を結着剤とした粉体加圧成形に
よる合剤ペレットの製造法、金属金網を支持体とした合
剤ペレットの製造法、スクリーン印刷方法などによる正
極合剤を集電体に塗布する製造法等があった。しかし、
特願平１−２８７７７号の記載内容により正極体の厚さ
制御、電池放電特性、電池封口特性などの面で便利であ
ることは明らかとなった。By the way, as a manufacturing method for a positive electrode body used in a flat battery with a thickness of less than 100 µm, first, a mixed powder of a positive electrode active material and a conductive material is combined by powder pressure molding using fluororesin powder as a binder. There were methods for manufacturing agent pellets, methods for manufacturing mixture pellets using a metal wire mesh as a support, and methods for applying a positive electrode mixture to a current collector using a screen printing method. but,
It has become clear from the description in Japanese Patent Application No. 1-28777 that this method is convenient in terms of controlling the thickness of the positive electrode body, battery discharge characteristics, battery sealing characteristics, etc.
特願平１−２６７７７号公報の発明の主旨は、正極活物
質と導電材の混合物に、結合剤、増粘剤および溶剤を加
えて、正極合剤ペーストを作成し、該ペーストを走行す
る金属又は樹脂のフィルム上に流し込み、ドクターブレ
ードにて一定厚さのペーストを形成する第１工程と、前
記フィルム上に形成されたペーストを加熱乾燥機を通し
て半乾燥状態にし、これを所定の形状に型つけする第２
工程と、型つけされたペースト半乾燥体を再び加熱乾燥
機を通して本乾燥させ、乾燥体を型つけされた形状に前
記フィルム上から剥離する第３工程とを有するものであ
った。The gist of the invention disclosed in Japanese Patent Application No. 1-26777 is to add a binder, a thickener, and a solvent to a mixture of a positive electrode active material and a conductive material to create a positive electrode mixture paste, Alternatively, the first step is to pour it onto a resin film and use a doctor blade to form a paste of a certain thickness, and then pass the paste formed on the film into a semi-dry state through a heating dryer, and mold it into a predetermined shape. The second thing to put on
and a third step of drying the patterned semi-dried paste by passing it through a heating dryer again, and peeling the dried product in the patterned shape from the film.
（発明が解決しようとする課題）
しかしながら、前記従来公報の記載の正極合剤ペースト
を走行する金属又は樹脂シート上に流し込み、ドクター
ブレードにて一定厚さのペースニ
ドを形成する第１工程において、長時間の塗さを行うと
正極合剤ペーストが沈降し、ドクターブレードにて一定
厚さのペーストを形成できなくなる問題が生じた。(Problem to be Solved by the Invention) However, in the first step of pouring the positive electrode mixture paste described in the above-mentioned conventional publication onto a moving metal or resin sheet and forming a paste nide of a constant thickness with a doctor blade, a long When timed coating was performed, the positive electrode mixture paste sedimented, causing a problem that it became impossible to form a paste of a constant thickness with a doctor blade.
これに対し、例えば回転式攪拌機を用いて正極合剤ペー
ストの沈降を防ぐと、空気をペースト中に巻き込み、−
層均一厚さのペーストを形成できなるばかりでなく、正
極合剤ペーストの増粘剤にポリアクリル酸を用いた場合
、回転攪拌羽根によってポリアクリル酸高分子鎖がせん
断され、著しい粘性低下を招いた。On the other hand, if a rotary stirrer is used to prevent the positive electrode mixture paste from settling, air will be drawn into the paste and -
Not only is it impossible to form a paste with a uniform layer thickness, but when polyacrylic acid is used as a thickener for the positive electrode mixture paste, the polyacrylic acid polymer chains are sheared by the rotating stirring blade, resulting in a significant decrease in viscosity. there was.
また、結着剤にポリテトラフルオロエチレン（ＰＴＦＥ
）を使用した場合も、ＰＴＦＥの繊維化物が攪拌羽根に
よって切られ、形成された合剤ペレットの強度が著しく
低下する問題が生じた。In addition, polytetrafluoroethylene (PTFE) is used as a binder.
) also caused the problem that the PTFE fibers were cut by the stirring blades and the strength of the formed mixture pellets was significantly reduced.
本発明は前記問題点に対応するもので、正極合剤ペース
トを上下対流式攪拌機で攪拌混合することで、正極合剤
ペーストを沈降させることなく、均一厚さのペーストを
長時間にわたって形成でき、電池性能のバラツキの小さ
い扁平形電池正極体を提供するものである。The present invention addresses the above-mentioned problems, and by stirring and mixing the positive electrode mixture paste with an up-and-down convection type stirrer, a paste of uniform thickness can be formed over a long period of time without causing the positive electrode mixture paste to settle. The present invention provides a flat battery positive electrode body with small variations in battery performance.
（課題を解決するための手段）
本発明は正極合剤ペーストを上下対流式攪拌機で攪拌す
る工程を有する正極体の製造法である。(Means for Solving the Problems) The present invention is a method for producing a positive electrode body, which includes a step of stirring a positive electrode mixture paste using a vertical convection type stirrer.
上下対流攪拌機は一般にせん断を避けたい物質とか、空
気の混入を避けたい物質の攪拌作業に使用し、泡を立て
ずに柔らかく上下対流を起こすもので、第１図に示すよ
うに、上下動するシリンダ１に固定されたシャフト２が
上下に移動し、シャフト２の先端に、第２図に示す攪拌
板３が装着されている。この攪拌板３によりペースト供
給容器４内で対流を起こさせる機構になっている。Vertical convection stirrers are generally used to stir materials that need to be avoided by shearing or mixing of air.They create soft vertical convection without creating bubbles, and as shown in Figure 1, they move up and down. A shaft 2 fixed to a cylinder 1 moves up and down, and a stirring plate 3 shown in FIG. 2 is attached to the tip of the shaft 2. This stirring plate 3 serves as a mechanism for causing convection within the paste supply container 4.
攪拌板３は第２図に示す（イ）球面型、（ロ）多孔型、
（ハ）平板型のいずれでも、正極合剤ペースト５の沈降
を防ぐことができ、かつ回転式攪拌機を用いた場合のよ
うな粘性低下、空気の巻き込みを最小に抑えることがで
きる。The stirring plate 3 is of the (a) spherical type, (b) porous type, as shown in Fig. 2.
(c) Either of the flat plate types can prevent sedimentation of the positive electrode mixture paste 5, and can minimize viscosity reduction and air entrainment as would be the case when a rotary stirrer is used.
（作 用）
本発明は前記の上下対流攪拌機を用いれば、ペーストの
沈降を抑制でき、さらに空気の巻き込みを最小にでき、
かつ増粘剤にポリアクリル酸を用い場合にも粘性低下を
招かない。また、結着剤にＰＴＦＥを使用した場合にも
ＰＴＦＥの繊維化物が切られることなく、正極合剤ベレ
ーストの強度の低下を招くこともない。(Function) By using the above-mentioned vertical convection stirrer, the present invention can suppress sedimentation of the paste, further minimize air entrainment,
Moreover, even when polyacrylic acid is used as a thickener, viscosity does not decrease. Further, even when PTFE is used as a binder, the PTFE fibers are not cut and the strength of the positive electrode mixture bereest is not reduced.
（実施例） 以下、本発明の実施例を記載する。(Example) Examples of the present invention will be described below.
第３図は本発明の製造装置を示す概念図である。FIG. 3 is a conceptual diagram showing the manufacturing apparatus of the present invention.
まず、二酸化マンガン９０重量％と黒鉛１０重量％の混
合物に、ポリアクリル酸１重量％とポリテトラフルオロ
エチレン（ＰＴＦＥ） ３重量％と水との分散液を混合
攪拌した粘稠性の正極合剤ペースト１１を調製した。First, a viscous positive electrode mixture was prepared by mixing and stirring a dispersion of 1% by weight of polyacrylic acid, 3% by weight of polytetrafluoroethylene (PTFE), and water in a mixture of 90% by weight of manganese dioxide and 10% by weight of graphite. Paste 11 was prepared.
次いで、第３図のペースト供給容器１２から上下対流式
攪拌機１０で、上下対流攪拌混合した正極合剤ペースト
１１を、走行する厚さ０．２ｍｍのポリエチレンテレフ
タレート樹脂の塗工面をシリコン離型剤で処理した基体
シート１３上に供給し、ドクターブレード１４にて一定
厚さのペースト１１を前記基体シート１３上に形成した
。Next, the positive electrode mixture paste 11 mixed by vertical convection stirring from the paste supply container 12 shown in FIG. The paste 11 was supplied onto the treated base sheet 13 and a constant thickness of paste 11 was formed on the base sheet 13 using a doctor blade 14 .
次いで、前記基体シート１３上に形成されたペースト１
１を、遠赤外線乾燥機１５でペースト１１中の水分を１
０〜３０重量％の半乾燥状態にし、半乾燥体１７を型つ
け機１６で所定の形状に型つけし、型っけされたペース
ト半乾燥体１７を、遠赤外線乾燥機１５を通して、ペー
ストｌｌ中の水分５重量％以下に本乾燥させ、乾燥体１
８を型つけされた形状にし、前記基体シート１３からバ
キュームで剥離し、個々に分離したペースト乾燥体１８
を得た。Next, the paste 1 formed on the base sheet 13
1, and the moisture in the paste 11 is reduced to 1 using a far infrared dryer 15.
The semi-dry body 17 is made into a semi-dry state with a concentration of 0 to 30% by weight, and is molded into a predetermined shape using a molding machine 16.The molded paste semi-dry body 17 is passed through a far-infrared dryer 15 to form a paste II. Mainly dried to a moisture content of 5% by weight or less, dried body 1
8 into a shaped shape, peeled off from the base sheet 13 by vacuum, and separated into individual paste dried bodies 18.
I got it.
この乾燥体１８をブレス１９で１０）ン加圧し、厚さ０
．２５市、外形２０Ｅｌｌ Ｘ ２０ｍｍの正極合剤ベ
レット２０状の正極体２２を得た。This dried body 18 is pressed 10) with a breather 19 to a thickness of 0.
．． A positive electrode body 22 in the form of a positive electrode mixture pellet 20 having an outer diameter of 20 mm and an outer diameter of 20 mm and 20 mm was obtained.
この正極体２２を用いて、第４図に示す正極端子板２１
と負極端子板２３の間に、セパレータ２５を介して前記
正極体２２とリチウム日を配置し、その周縁部を枠状絶
縁封口体２Ｂで密封口にした厚さ０．５ｍｍの扁平形電
池を製造して、実施例とした。Using this positive electrode body 22, the positive electrode terminal plate 21 shown in FIG.
The positive electrode body 22 and the lithium battery are arranged between the positive electrode terminal plate 23 and the negative electrode terminal plate 23 with a separator 25 in between, and the periphery of the positive electrode body 22 is sealed with a frame-shaped insulating sealing body 2B. It was manufactured and used as an example.
（比較例１）
・比較例１として、前記正極合剤ペーストｌＯを攪拌せ
ずに長時間塗布を行なったこと以外、実施例と同様の方
法で製造した扁平形電池を使用した。(Comparative Example 1) - As Comparative Example 1, a flat battery was used that was manufactured in the same manner as in the example except that the positive electrode mixture paste 1O was applied for a long time without stirring.
（比較例２）
・比較例２として、前記正極合剤ペースト１０をかい十
字型羽根を装着した回転式攪拌機で攪拌して、長時間検
電を行った以外、実施例と同様の方法で製造した扁平形
電池を使用した。(Comparative Example 2) - As Comparative Example 2, the positive electrode mixture paste 10 was stirred with a rotary stirrer equipped with swastika-shaped blades, and the voltage was detected for a long time, but the product was manufactured in the same manner as in the example. A flat battery was used.
本実施例及び比較例１．２によって、合剤ベレットの強
度の厚さバラツキ、３０にΩ連続放電で２．５Ｖまで放
電させた時の電池放電容量のバラツキとを、各々１００
個のベレットと扁平形電池とについて評価して下表に示
す。According to the present example and comparative example 1.2, the thickness variation in the strength of the mixture pellet and the variation in battery discharge capacity when discharged to 2.5V with continuous discharge of 30Ω
The results are shown in the table below.
表
尚、ベレットの強度は真空ピンセットで基体シート１３
からベレットを剥離取出しする際のベレットの割れた数
を示す。In addition, the strength of the pellet is measured using vacuum tweezers on the base sheet 13.
This shows the number of cracks in the pellet when the pellet is peeled off and taken out.
上表のように、本発明の扁平形電池正極体の製造法は、
他に対し優位である。As shown in the above table, the method for manufacturing the flat battery positive electrode body of the present invention is as follows:
It has an advantage over others.
以上詳述のごとく、本発明によれば正極体の厚さのバラ
ツキ、重量バラツキを低減でき、しかも、強度をそこな
うことなく、薄形の正極体を効率よく製造するものであ
る。As described in detail above, according to the present invention, it is possible to reduce variations in the thickness and weight of positive electrode bodies, and to efficiently manufacture thin positive electrode bodies without sacrificing strength.
第１図は本発明に用いる上下対流式攪拌機の概念図、第
２図（イ）、（ロ）、（ハ）は本発明の攪拌機に用いる
攪拌板の実施例の正面図である。
第３図は本発明の正極体の製造装置を示す概念図、第４
図は本発明によりなる扁平形電池の断面図である。
１・・・シリンダ ２・・・攪拌シャフト
３・・・攪拌板
４．１２・・・ペースト供給容器 ５，１１・・・ペー
ストＩＯ・・・上下対流式攪拌機
１４・・・ドクターブレード １５・・・乾燥機１
６・・・型つけ機 １８・・・乾燥体２０
・・・ベレット ２２・・・正極体＠１図FIG. 1 is a conceptual diagram of a vertical convection type stirrer used in the present invention, and FIGS. 2 (a), (b), and (c) are front views of examples of stirring plates used in the stirrer of the present invention. FIG. 3 is a conceptual diagram showing the positive electrode body manufacturing apparatus of the present invention, and FIG.
The figure is a sectional view of a flat battery according to the present invention. 1... Cylinder 2... Stirring shaft 3... Stirring plate 4. 12... Paste supply container 5, 11... Paste IO... Vertical convection type stirrer 14... Doctor blade 15...・Dryer 1
6... Shaping machine 18... Dry body 20
...Bellet 22...Positive electrode body @1 diagram
Claims (1)
び溶剤を加えて正極合剤ペーストを作成し、該ペースト
を走行する金属又は樹脂シート上に流し込み、ドクター
ブレードにて一定厚さのペーストを形成する工程を有す
る扁平形電池正極体の製造法において、 上記正極合剤ペーストを上下対流攪拌混合する工程が、
シート上に流し込み前に有することを特徴とする扁平形
電池正極体の製造法。[Claims] A positive electrode mixture paste is prepared by adding a binder, a thickener, and a solvent to a mixture of a positive electrode active material and a conductive material, and the paste is poured onto a running metal or resin sheet and In a method for manufacturing a flat battery positive electrode body that includes a step of forming a paste of a constant thickness with a blade, the step of mixing the positive electrode mixture paste by vertical convection stirring,
1. A method for producing a flat battery positive electrode body, characterized in that it is provided on a sheet before being poured.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP27846389A JPH03141553A (en) | 1989-10-27 | 1989-10-27 | Manufacture of flat battery positive electrode body |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP27846389A JPH03141553A (en) | 1989-10-27 | 1989-10-27 | Manufacture of flat battery positive electrode body |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH03141553A true JPH03141553A (en) | 1991-06-17 |
Family
ID=17597681
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP27846389A Pending JPH03141553A (en) | 1989-10-27 | 1989-10-27 | Manufacture of flat battery positive electrode body |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH03141553A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010027403A (en) * | 2008-07-18 | 2010-02-04 | Mitsui Eng & Shipbuild Co Ltd | Paste manufacturing method |
| JP2010086788A (en) * | 2008-09-30 | 2010-04-15 | Nippon Zeon Co Ltd | Method of manufacturing electrode for electrochemical element |
| EP2530766A1 (en) * | 2011-05-30 | 2012-12-05 | Heimbach GmbH & Co. KG | Battery pasting belt |
-
1989
- 1989-10-27 JP JP27846389A patent/JPH03141553A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010027403A (en) * | 2008-07-18 | 2010-02-04 | Mitsui Eng & Shipbuild Co Ltd | Paste manufacturing method |
| JP2010086788A (en) * | 2008-09-30 | 2010-04-15 | Nippon Zeon Co Ltd | Method of manufacturing electrode for electrochemical element |
| EP2530766A1 (en) * | 2011-05-30 | 2012-12-05 | Heimbach GmbH & Co. KG | Battery pasting belt |
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