JPS5851667B2 - Method for producing positive electrode for non-aqueous electrolyte battery - Google Patents
Method for producing positive electrode for non-aqueous electrolyte batteryInfo
- Publication number
- JPS5851667B2 JPS5851667B2 JP2204778A JP2204778A JPS5851667B2 JP S5851667 B2 JPS5851667 B2 JP S5851667B2 JP 2204778 A JP2204778 A JP 2204778A JP 2204778 A JP2204778 A JP 2204778A JP S5851667 B2 JPS5851667 B2 JP S5851667B2
- Authority
- JP
- Japan
- Prior art keywords
- positive electrode
- battery
- electrode active
- polytetrafluoroethylene
- aqueous electrolyte
- 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
Links
Classifications
-
- Y02E60/12—
Description
【発明の詳細な説明】
本発明は、非水の有機電解質を有する電池における正極
の作製法に係り、とくにリチウム、ナトリウムなどの軽
金属を負極活物質とする電池に好適な正極の作製法に関
する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing a positive electrode in a battery having a non-aqueous organic electrolyte, and particularly to a method for manufacturing a positive electrode suitable for a battery using a light metal such as lithium or sodium as a negative electrode active material.
リチウム、ナトリウムなどの軽金属を負極活物質とし、
非水の有機電解質を用いる電池の正極活物質としては、
各種の金属ハロゲン化物、金属酸化物、酸素酸塩、硫化
物などが用いられている。Light metals such as lithium and sodium are used as negative electrode active materials,
As positive electrode active materials for batteries using non-aqueous organic electrolytes,
Various metal halides, metal oxides, oxyacids, sulfides, etc. are used.
これらの正極活物質のうち、それ自身で良好な電気導電
性を有するものは、はとんど皆無である。Of these positive electrode active materials, almost none have good electrical conductivity by themselves.
したがって、これらの正極活物質に集水粉末を導電剤と
して混合し、さらに正極活物質と炭素粉末を結着させる
ために、結着剤として、ポリテトラフルオロエチレン粉
末を混合し、正極に成型している。Therefore, water collection powder is mixed with these positive electrode active materials as a conductive agent, and in order to bind the positive electrode active material and carbon powder, polytetrafluoroethylene powder is mixed as a binder and molded into a positive electrode. ing.
ポリテトラフルオロエチレン粉末としては、平均粒径０
．３μ扉程度のものを溶液中に分散させた、いわゆるポ
リテトラフルオロエチレンのディスパージョン液が用い
られる。As polytetrafluoroethylene powder, the average particle size is 0.
．． A so-called polytetrafluoroethylene dispersion liquid in which particles of about 3 μm are dispersed in the solution is used.
正極活物質、炭素粉末、およびポリテトラフルオロエチ
レンのディスパージョン液を混合し、充分攪拌すると、
非常に粘着性に富んだ混和物が得られる。When the positive electrode active material, carbon powder, and polytetrafluoroethylene dispersion liquid are mixed and stirred thoroughly,
A very sticky mixture is obtained.
この混和物を加圧成型したのち乾燥するか、あるいは混
和物をあらかじめ乾燥した後に加圧成型すると、容易に
有機電解質電池用の正極を得ることができる。A positive electrode for an organic electrolyte battery can be easily obtained by pressure molding this mixture and then drying it, or by drying the mixture in advance and then pressure molding it.
しかし、上記した方法によると、正極活物質の表面をポ
リテトラフルオロエチレンの微粒子が被覆し、電池の反
応を阻害するために、正極活物質の利用率が低いという
欠点がある。However, the method described above has the disadvantage that the utilization rate of the positive electrode active material is low because the surface of the positive electrode active material is coated with fine particles of polytetrafluoroethylene, which inhibits the reaction of the battery.
この欠点を除去するためには、ポリテトラフルオロエチ
レン量を少なくすればよいが、しかし、この量を少なく
すると充分な強度を有する正極が得られないという問題
がある。In order to eliminate this drawback, the amount of polytetrafluoroethylene may be reduced, but if this amount is reduced, there is a problem that a positive electrode with sufficient strength cannot be obtained.
本発明は上記したような従来技術のもつ欠点を除去し、
すぐれた性能を有する正極の作製法を提供するにある。The present invention eliminates the drawbacks of the prior art as described above,
An object of the present invention is to provide a method for producing a positive electrode having excellent performance.
本発明の要点は、まず、導電剤である炭素粉末にポリテ
トラフルオロエチレンを付着させ、ついでこれに正極活
物質を混合して、正極に成型するものである。The gist of the present invention is to first attach polytetrafluoroethylene to carbon powder, which is a conductive agent, and then to mix a positive electrode active material therewith and mold it into a positive electrode.
すなわち、ポリテトラフルオロエチレンによって正極活
物質の表面が被覆されるのを防止するために、まず炭素
粉末とポリテトラフルオロエチレン微粒子の分散液を混
合し、ポリテトラフルオロエチレンを炭素粉末に付着さ
せたのちに、この混合物を乾燥し、次いで正極活物質を
混合して正極に成型するものである。That is, in order to prevent the surface of the positive electrode active material from being coated with polytetrafluoroethylene, a dispersion of carbon powder and polytetrafluoroethylene fine particles was first mixed, and polytetrafluoroethylene was attached to the carbon powder. Later, this mixture is dried, and then a positive electrode active material is mixed and molded into a positive electrode.
本発明のように、２段階の混合によって正極構成材料粉
末を混合するというこころみはこれまでなされたことは
なく、発明者らの一連の実験結果から、もつともすぐれ
た性能を有す正極を得るための方法として見い出された
ものである。As in the present invention, an attempt to mix cathode constituent material powders through two-step mixing has never been made, and from a series of experimental results by the inventors, it is clear that the method of mixing cathode constituent material powders in two stages has not been achieved. It was discovered as a method.
本発明によれば、正極活物質の利用率が従来の３者を一
度に混合するものよりも大幅に向上し、そのために電池
の放電寿命が大幅に延びる。According to the present invention, the utilization rate of the positive electrode active material is significantly improved compared to the conventional method in which all three materials are mixed at once, and therefore the discharge life of the battery is significantly extended.
これは、正極活物質の表面をポリテトラフルオロエチレ
ンが被覆する割合が減少するためであると考えられる。This is considered to be because the proportion of polytetrafluoroethylene covering the surface of the positive electrode active material decreases.
なお、本発明による正極の強度は従来の方法によるもの
とまったく変わらない。Note that the strength of the positive electrode according to the present invention is no different from that obtained using the conventional method.
以下、本発明の実施例について説明する。Examples of the present invention will be described below.
実施例
炭素粉末１１’にアセトン２０ＷＬｌを加えて泥状にし
、これにポリテトラフルオロエチレン微粒子（粒径０．
２〜０．４μＷＬ）の分散液（ダイキン工業製、ポリフ
ロンディスパージョン、ポリテトラフルオロエチレン含
有量６０％）１５２を加え、充分攪拌してペースト状の
混和物を得た。Example 20 WLl of acetone was added to the carbon powder 11' to make it into a slurry, and polytetrafluoroethylene fine particles (particle size 0.
A dispersion liquid (Polyflon Dispersion, manufactured by Daikin Industries, Ltd., polytetrafluoroethylene content 60%) 152 of 2 to 0.4 μWL) was added thereto, and thoroughly stirred to obtain a paste-like mixture.
この混和物を１１０〜１２０℃で３０分間以上加熱して
、アセトンおよび水を除去したのちに、メノウ製のボー
ルミルに移し、二酸化マンガン粉末と混合した。This mixture was heated at 110 to 120° C. for 30 minutes or more to remove acetone and water, and then transferred to an agate ball mill and mixed with manganese dioxide powder.
混和物と二酸化マンガン粉末との割合は、混和物２０部
に対して、二酸化マンガン８０部とした。The ratio of the mixture and manganese dioxide powder was 80 parts of manganese dioxide to 20 parts of the mixture.
この混和物０．５７ｒを３０００Ｊ／ｃａの圧力で加圧
して、直径１５ｍの正極に成型した。0.57 r of this mixture was pressurized at a pressure of 3000 J/ca and molded into a positive electrode with a diameter of 15 m.
ついで、この成型物を減圧中で２００！に４時間保ち、
充分に乾燥させたのちに、乾燥不活性ガス雰囲気中でニ
ッケル製の電池ケース内に充填し、１ｍｏｌ／Ｊの過塩
素酸リチウムを溶解したプロピレンカーボネートからな
る有機電解液を含浸させたポリプロピレン不織布、およ
びリチウムをさらに電池ケース内に充填して電池を作っ
た。Next, this molded product was placed under reduced pressure for 200 hrs. keep it for 4 hours,
After sufficiently drying, the polypropylene nonwoven fabric was filled into a nickel battery case in a dry inert gas atmosphere and impregnated with an organic electrolyte consisting of propylene carbonate in which 1 mol/J of lithium perchlorate was dissolved. A battery was made by further filling the battery case with lithium and lithium.
第１図に本発明で得た電池の断面を示す。FIG. 1 shows a cross section of a battery obtained according to the present invention.
１が本発明による正極、２がリチウム、３が有機電解液
を含浸したポリプロピレン不織布、４がニッケル製電池
ケース、５が電池上蓋、６が高分子樹脂からなるバッキ
ングである。1 is a positive electrode according to the present invention, 2 is lithium, 3 is a polypropylene nonwoven fabric impregnated with an organic electrolyte, 4 is a nickel battery case, 5 is a battery top cover, and 6 is a backing made of polymer resin.
第２図に本発明で得た正極を用いた電池に３に、Ｑの定
抵抗を接続して放電させたときの電池電圧の経時変化を
、記号Ａで示す。In FIG. 2, the symbol A shows the change in battery voltage over time when a constant resistance of Q is connected to a battery using the positive electrode obtained according to the present invention and the battery is discharged.
なお、第２図には、比較のために、従来の正極の作製法
、すなわち炭素粉末、二酸化マンガン、ポリテトラフル
オロエチレン微粒子の分散液を同時に混合し、他は上記
実施例と同様にして得た正極を用いた電池の特性を、記
号Ｂで示す。For comparison, FIG. 2 shows a conventional positive electrode manufacturing method, in which a dispersion of carbon powder, manganese dioxide, and polytetrafluoroethylene fine particles were mixed at the same time, and the other conditions were the same as in the above example. Symbol B indicates the characteristics of a battery using a positive electrode.
第２図から、本発明による正極を用いた電池の方が大幅
にすぐれた性能をもつことがわかる。From FIG. 2, it can be seen that the battery using the positive electrode according to the invention has significantly better performance.
なお、正極活物質である二酸化マンガンの利用率は、従
来の方法によるものが約７５％であったのに対して、本
発明のものは９５％以上であった。The utilization rate of manganese dioxide, which is a positive electrode active material, was approximately 75% in the conventional method, whereas it was 95% or more in the method of the present invention.
以上のことから、本発明はその工業的価値が極めて大き
いものである。From the above, the present invention has extremely great industrial value.
第１図は本発明による電池の断面図、第２図は本発明に
よる正極を用いた電池の放電特性図である。
１・・・・・・正極、２・・・・・・リチウム、３・・
・・・・不織布、４・・・・・・電池ケース、５・・・
・・・電池上蓋、６・・・・・・バッキング、Ａ・・・
・・・本発明の方法で製作した電池、Ｂ・・・・・・従
来法で製作した電池。FIG. 1 is a sectional view of a battery according to the present invention, and FIG. 2 is a discharge characteristic diagram of a battery using a positive electrode according to the present invention. 1...Positive electrode, 2...Lithium, 3...
...Nonwoven fabric, 4...Battery case, 5...
...Battery top cover, 6...Backing, A...
...Battery produced by the method of the present invention, B...Battery produced by the conventional method.
Claims (1)
、該混合物を乾燥した後に正極活物質粉末を混合して正
極に成型することを特徴とする非水電解液電池用電極の
作製法。1. Production of an electrode for a non-aqueous electrolyte battery, which is characterized in that a dispersion in which binder particles are dispersed and carbon powder are mixed, and after drying the mixture, a positive electrode active material powder is mixed and molded into a positive electrode. Law.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2204778A JPS5851667B2 (en) | 1978-03-01 | 1978-03-01 | Method for producing positive electrode for non-aqueous electrolyte battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2204778A JPS5851667B2 (en) | 1978-03-01 | 1978-03-01 | Method for producing positive electrode for non-aqueous electrolyte battery |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS54115730A JPS54115730A (en) | 1979-09-08 |
| JPS5851667B2 true JPS5851667B2 (en) | 1983-11-17 |
Family
ID=12072004
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2204778A Expired JPS5851667B2 (en) | 1978-03-01 | 1978-03-01 | Method for producing positive electrode for non-aqueous electrolyte battery |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5851667B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0275159A (en) * | 1988-09-08 | 1990-03-14 | Sanyo Electric Co Ltd | Non-aqueous electrolyte battery and manufacture of its positive electrode its manufacture |
-
1978
- 1978-03-01 JP JP2204778A patent/JPS5851667B2/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| JPS54115730A (en) | 1979-09-08 |
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