JPH0638338B2 - Battery - Google Patents
BatteryInfo
- Publication number
- JPH0638338B2 JPH0638338B2 JP3161388A JP3161388A JPH0638338B2 JP H0638338 B2 JPH0638338 B2 JP H0638338B2 JP 3161388 A JP3161388 A JP 3161388A JP 3161388 A JP3161388 A JP 3161388A JP H0638338 B2 JPH0638338 B2 JP H0638338B2
- Authority
- JP
- Japan
- Prior art keywords
- positive electrode
- mixture
- battery
- electrode
- aqueous dispersion
- 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.)
- Expired - Fee Related
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
- H01M4/06—Electrodes for primary cells
- H01M4/08—Processes of manufacture
-
- 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
- H01M4/62—Selection of inactive substances as ingredients for active masses, e.g. binders, fillers
- H01M4/621—Binders
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Battery Electrode And Active Subsutance (AREA)
Description
【発明の詳細な説明】 ＜産業上の利用分野＞ この発明は、シート状の電極を用いる電池に関するもの
である。TECHNICAL FIELD The present invention relates to a battery using a sheet-shaped electrode.
＜従来の技術＞ 例えばリチウム電池に代表される非水電解液電池では、
シート状の電極を、セパレータを介して重ね合わせ、更
にこれらを一緒に巻回して構成される発電要素を電池缶
中に収納するという構成を採っている。<Prior Art> For example, in a non-aqueous electrolyte battery represented by a lithium battery,
A sheet-shaped electrode is stacked via a separator, and the power-generating element formed by winding the electrodes together is housed in a battery can.
上記のようなシート状電極を作製する場合、リチウム−
二酸化マンガン電池に用いるシート状正極を例に採れ
ば、二酸化マンガンを主成分とする正極活物質に、適当
量の水を加え、一定時間混練した後、バインダーとして
のテフロン水性ディスパージョンと粘度調整用の水とを
同時に加え、これを更に混練してスラリー状の正極合剤
を作り、次いでこのスラリー状正極合剤を多孔性集電体
に塗着し、最後に乾燥する等の手順が採られる。When producing the sheet-like electrode as described above, lithium-
Taking a sheet-shaped positive electrode used for a manganese dioxide battery as an example, an appropriate amount of water is added to a positive electrode active material containing manganese dioxide as a main component, and after kneading for a certain time, Teflon aqueous dispersion as a binder and a viscosity adjusting agent Water is added at the same time, and this is further kneaded to form a slurry-like positive electrode mixture, and then this slurry-like positive electrode mixture is applied to a porous current collector, and finally dried. .
＜発明が解決しようとする問題点＞ しかしながら、従来よりバインダーとして用いられてい
るテフロン水性ディスパージョンは、そのバインダー効
果が弱い。このため、これをバインダーとするスラリー
状合剤を多孔性集電体に塗着し乾燥した場合、合剤がう
まく塗着できない面ができ、塗りムラができる。このた
め、例えば電極密度を高めるべくこの電極を圧延した場
合、合剤の剥がれが生じ、また厚く塗られた部分が延ば
されるために電極にソリが発生する等という問題があ
り、電池の工程歩留り低下を招く原因となっていた。<Problems to be Solved by the Invention> However, the Teflon aqueous dispersion conventionally used as a binder has a weak binder effect. For this reason, when the slurry mixture containing this as a binder is applied to the porous current collector and dried, a surface where the mixture cannot be applied well is formed, resulting in uneven coating. Therefore, for example, when this electrode is rolled to increase the electrode density, there is a problem that the mixture is peeled off and the electrode is warped because the thickly coated part is extended, and the process yield of the battery is increased. It was the cause of the decrease.
また、テフロン水性ディスパージョンのバインダー効果
が弱いため、合剤の結着力が弱く、発電要素巻回時や取
扱時などにおいて多孔性集電体から脱落したりする。そ
して、このように合剤が脱落した場合、多孔性集電体の
表面が露出してしまい、この多孔性集電体がセパレータ
を突き破って対極に接触し、内部ショートの原因になる
という問題もある。Further, since the binder effect of the Teflon aqueous dispersion is weak, the binding force of the mixture is weak, and the Teflon aqueous dispersion may fall off from the porous current collector when the power generating element is wound or handled. Then, when the mixture falls off in this way, the surface of the porous current collector is exposed, and this porous current collector pierces the separator and contacts the counter electrode, which also causes a problem of internal short circuit. is there.
＜問題点を解決するための手段＞ 以上の問題に鑑みなされたこの発明の電池は、二酸化マ
ンガンを主成分とする活物質に、バインダーとしてテフ
ロン水性ディスパージョンと、増粘剤としてポリアクリ
ルアミドを混合してなる正極合剤を用いたことを要旨と
する。<Means for Solving Problems> In the battery of the present invention made in view of the above problems, an active material containing manganese dioxide as a main component is mixed with Teflon aqueous dispersion as a binder and polyacrylamide as a thickener. The gist is to use the positive electrode mixture obtained from
上記の活物質、テフロン水性ディスパージョン、ポリア
クリルアミドなどの混合量としては、活物質８０〜９８
重量％、テフロン水性ディスパージョン１〜１０重量
％、ポリアクリルアミド 0.1〜１０重量％が好ましい。The amount of the active material, Teflon aqueous dispersion, polyacrylamide, etc., to be mixed is 80-98.
% By weight, Teflon aqueous dispersion 1 to 10% by weight, and polyacrylamide 0.1 to 10% by weight are preferred.
ポリアクリルアミドの使用量をこのように規定したの
は、 0.1重量％以下では粘度が不足して所望の効果が得
られず、また１０重量％以上では合剤の粘度が上がりす
ぎて混練後の取扱性が悪化するからである。The amount of polyacrylamide used is specified in this way because if it is 0.1% by weight or less, the viscosity is insufficient to obtain the desired effect, and if it is 10% by weight or more, the viscosity of the mixture is too high and the handling after kneading is performed. This is because the sex deteriorates.
また、このポリアクリルアミドは、非水電解液電池等に
用いられる有機系の電解液にも安定であるので、電池の
性能劣化の原因となることもない。Further, since this polyacrylamide is stable in an organic electrolyte used in a non-aqueous electrolyte battery or the like, it does not cause deterioration of battery performance.
一方、テフロン水性ディスパージョンの使用量が上記の
範囲より少なければ、後述する熱処理後において合剤の
バインダー効果が不足する。また、このテフロン水性デ
ィスパージョンは絶縁体であり、熱処理後も電極に残存
するので、この範囲より多ければ電池の内部抵抗を増大
させ、電池性能の著しい低下を招く。On the other hand, if the amount of Teflon aqueous dispersion used is less than the above range, the binder effect of the mixture will be insufficient after the heat treatment described below. Further, since this Teflon aqueous dispersion is an insulator and remains in the electrode even after the heat treatment, if it is more than this range, the internal resistance of the battery is increased and the battery performance is remarkably deteriorated.
そして、本発明の電池では、このようにして得た合剤
を、例えば多孔性集電体に塗着し、あるいはシート状に
成形し、次いで加熱乾燥処理するなどして作った電極を
用いることができる。Then, in the battery of the present invention, the electrode obtained by coating the mixture thus obtained on, for example, a porous current collector, or forming it into a sheet, and then subjecting it to heat drying treatment is used. You can
＜作 用＞ 上記のポリアクリルアミドを増粘剤に用いることで、合
剤の粘度並びに結着力が高まる。このため、例えばこの
合剤を多孔性集電体に塗着して電極を作製する場合、塗
りムラなくまた容易に塗着が行なえ、またこの電極を圧
延する場合でも合剤脱落や電極のソリ等が防げる。<Operation> By using the above-mentioned polyacrylamide as a thickener, the viscosity and binding force of the mixture are increased. Therefore, for example, when the electrode is produced by applying this mixture onto a porous current collector, the application can be performed easily without uneven coating, and even when this electrode is rolled, the mixture is removed or the electrode is slid. Etc. can be prevented.
＜実施例＞ 二酸化マンガンを主成分としカーボン粉末を導電剤とし
て混合した正極活物質９５重量％と、テフロン水性ディ
スパージョン（樹脂分） 4.5重量％を２０℃に加温した
後、アルコールを適量添加混練するとテフロン粒子が凝
集してクリーム状となった。このクリーム状バインダー
と、ポリアクリルアミド 0.5重量％と、適量の水を加
え、混練して本発明の正極合剤を作った。この正極合剤
を多孔性集電体に塗着した後、ロール圧延し、最後に加
熱乾燥処理してシート状の正極を作製した。<Example> 95% by weight of a positive electrode active material containing manganese dioxide as a main component and carbon powder as a conductive agent and 4.5% by weight of Teflon aqueous dispersion (resin content) were heated to 20 ° C., and then an appropriate amount of alcohol was added. When kneaded, the Teflon particles aggregated into a cream. This creamy binder, 0.5% by weight of polyacrylamide and an appropriate amount of water were added and kneaded to prepare the positive electrode mixture of the present invention. The positive electrode mixture was applied to the porous current collector, rolled, and finally heat-dried to prepare a sheet-shaped positive electrode.
こうして作った正極を、セパレータを介して、リチウム
をシート状に圧延した負極と積重し、更にこれらを渦巻
状に巻回して発電要素を作製し、次いでこの渦巻状発電
要素を電池缶に収納するなどして、本発明に係わる筒形
のリチウム−マンガン電池を作製した。The positive electrode thus prepared is stacked with the negative electrode obtained by rolling lithium into a sheet shape through the separator, and these are spirally wound to produce a power generation element, which is then housed in a battery can. By doing so, a cylindrical lithium-manganese battery according to the present invention was produced.
一方、二酸化マンガンを主成分とし、またカーボン粉末
を導電剤として混合した正極活物質９５重量％に、テフ
ロン水性ディスパージョン（樹脂分） 4.5重量％と適量
の水とを加え、その他は上記と同様にして作った正極合
剤を多孔性集電体に塗着してシート状の正極を作製し、
この正極を用いた他は同様にして、同じく筒形の従来の
リチウム−マンガン電池を作製した。On the other hand, to 95% by weight of a positive electrode active material containing manganese dioxide as a main component and carbon powder as a conductive agent, 4.5% by weight of Teflon aqueous dispersion (resin content) and an appropriate amount of water were added. The positive electrode mixture prepared in the above is applied to a porous current collector to prepare a sheet-shaped positive electrode,
A conventional cylindrical lithium-manganese battery was prepared in the same manner except that this positive electrode was used.
これら２つの電池をそれぞれ１００個ずつ作り、その歩
留りを求めた所、本発明品では９３％であったのに対
し、従来電池では８５％であった。When 100 of each of these two batteries were made and the yield was calculated, it was 93% for the product of the present invention, whereas it was 85% for the conventional battery.
本発明品では、正極における合剤の塗りムラがなく、ま
た上記の圧延後でも合剤脱落や電極のソリ等がなく、こ
のため発電要素巻回時の構成要素の巻きずれ更には合剤
脱落に因る内部ショートが極めて起きにくいことから、
このように工程歩留りが向上した。In the product of the present invention, there is no coating unevenness of the mixture on the positive electrode, and there is no mixture drop or electrode warp even after the above rolling. Therefore, winding deviation of the constituent elements during winding of the power generating element and further mixture drop It is extremely unlikely that an internal short circuit due to
Thus, the process yield is improved.
尚、本発明において、上記のように正極合剤を多孔性集
電体に塗着する等したものを正極に用いる他、同様な正
極合剤を押出し成形等でシート状に成形し次いでこれを
多孔性集電体に圧着する等したものを正極に用いても良
い。In the present invention, a positive electrode mixture obtained by coating a positive electrode mixture on a porous current collector as described above is used for the positive electrode, and a similar positive electrode mixture is formed into a sheet by extrusion molding or the like, and then this is formed. You may use for a positive electrode what was pressure-bonded to the porous collector.
＜発明の効果＞ 以上のようにこの発明によれば、ポリアクリルアミドを
増粘剤として加えた正極合剤を用いたことにより、表面
が平滑で厚みの均一なシート状正極を提供でき、電池の
工程歩留まりの向上が図れる。また、合剤の脱落を有効
に防ぐことができ、正極製作時における作業性の向上及
び合剤脱落に因る内部ショートが制御されて電池の安全
性が高まるといった効果を奏する。<Effects of the Invention> As described above, according to the present invention, by using the positive electrode mixture containing polyacrylamide as a thickener, it is possible to provide a sheet-shaped positive electrode having a smooth surface and a uniform thickness. The process yield can be improved. In addition, it is possible to effectively prevent the mixture from falling off, improve the workability during production of the positive electrode, and control the internal short circuit due to the mixture to fall off, thereby improving the safety of the battery.
Claims (1)
バインダーとしてテフロン水性ディスパージョンと、増
粘剤としてポリアクリルアミドを混合してなる正極合剤
を用いたことを特徴とする電池。1. An active material containing manganese dioxide as a main component,
A battery characterized by using a positive electrode mixture obtained by mixing Teflon aqueous dispersion as a binder and polyacrylamide as a thickener.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3161388A JPH0638338B2 (en) | 1988-02-13 | 1988-02-13 | Battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3161388A JPH0638338B2 (en) | 1988-02-13 | 1988-02-13 | Battery |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH01206564A JPH01206564A (en) | 1989-08-18 |
| JPH0638338B2 true JPH0638338B2 (en) | 1994-05-18 |
Family
ID=12336059
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3161388A Expired - Fee Related JPH0638338B2 (en) | 1988-02-13 | 1988-02-13 | Battery |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0638338B2 (en) |
-
1988
- 1988-02-13 JP JP3161388A patent/JPH0638338B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH01206564A (en) | 1989-08-18 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |