JPH01206563A - Manufacture of sheet electrode - Google Patents
Manufacture of sheet electrodeInfo
- Publication number
- JPH01206563A JPH01206563A JP63031612A JP3161288A JPH01206563A JP H01206563 A JPH01206563 A JP H01206563A JP 63031612 A JP63031612 A JP 63031612A JP 3161288 A JP3161288 A JP 3161288A JP H01206563 A JPH01206563 A JP H01206563A
- Authority
- JP
- Japan
- Prior art keywords
- sheet
- alcohol
- water
- teflon
- mixture
- 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.)
- Granted
Links
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 12
- 239000000203 mixture Substances 0.000 claims abstract description 50
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 38
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims abstract description 35
- 239000004809 Teflon Substances 0.000 claims abstract description 35
- 229920006362 Teflon® Polymers 0.000 claims abstract description 35
- 239000006185 dispersion Substances 0.000 claims abstract description 28
- 238000004898 kneading Methods 0.000 claims abstract description 21
- NUJOXMJBOLGQSY-UHFFFAOYSA-N manganese dioxide Chemical compound O=[Mn]=O NUJOXMJBOLGQSY-UHFFFAOYSA-N 0.000 claims abstract description 8
- 239000006071 cream Substances 0.000 claims abstract description 4
- 239000011149 active material Substances 0.000 claims description 7
- 238000000034 method Methods 0.000 claims description 2
- 239000011230 binding agent Substances 0.000 abstract description 20
- 239000002245 particle Substances 0.000 abstract description 9
- 230000000694 effects Effects 0.000 abstract description 6
- 239000013543 active substance Substances 0.000 abstract description 3
- 235000019441 ethanol Nutrition 0.000 description 26
- 239000007774 positive electrode material Substances 0.000 description 10
- 239000002002 slurry Substances 0.000 description 6
- 239000011248 coating agent Substances 0.000 description 4
- 238000000576 coating method Methods 0.000 description 4
- 239000004020 conductor Substances 0.000 description 4
- 238000001125 extrusion Methods 0.000 description 4
- 238000010248 power generation Methods 0.000 description 4
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 3
- 230000007423 decrease Effects 0.000 description 3
- 238000000465 moulding Methods 0.000 description 3
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 2
- FBDMJGHBCPNRGF-UHFFFAOYSA-M [OH-].[Li+].[O-2].[Mn+2] Chemical compound [OH-].[Li+].[O-2].[Mn+2] FBDMJGHBCPNRGF-UHFFFAOYSA-M 0.000 description 2
- 239000008280 blood Substances 0.000 description 2
- 210000004369 blood Anatomy 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 229910052744 lithium Inorganic materials 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- BDERNNFJNOPAEC-UHFFFAOYSA-N propan-1-ol Chemical compound CCCO BDERNNFJNOPAEC-UHFFFAOYSA-N 0.000 description 2
- 229910001220 stainless steel Inorganic materials 0.000 description 2
- 239000010935 stainless steel Substances 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 238000004220 aggregation Methods 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- 150000001298 alcohols Chemical class 0.000 description 1
- 238000009835 boiling Methods 0.000 description 1
- 239000006229 carbon black Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 239000006258 conductive agent Substances 0.000 description 1
- 239000002612 dispersion medium Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 229910002804 graphite Inorganic materials 0.000 description 1
- 239000010439 graphite Substances 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 239000011255 nonaqueous electrolyte Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 235000021419 vinegar Nutrition 0.000 description 1
- 239000000052 vinegar Substances 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
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
- H01M4/04—Processes of manufacture in general
- H01M4/0402—Methods of deposition of the material
- H01M4/0404—Methods of deposition of the material by coating on electrode collectors
-
- 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
- H01M4/04—Processes of manufacture in general
-
- 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
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Battery Electrode And Active Subsutance (AREA)
Abstract
Description
【発明の詳細な説明】
〈産業上の利用分野〉
この発明は、シート状正極合剤の製造方法に関するもの
である。DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a method for producing a sheet-like positive electrode mixture.
〈従来の技術〉
リチウム電池に代表される非水電解液電池、あるいはＮ
ｉ−Ｃｄ蓄電池等では、シート状の電極を、セパレータ
を介して重ね合せ、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。<Conventional technology> Non-aqueous electrolyte batteries such as lithium batteries, or N
An i-Cd storage battery or the like employs a structure in which sheet-like electrodes are stacked on top of each other with a separator interposed therebetween, and a power generation element formed by winding these 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、例えばリチ
ウムー二酸化マンガン電池等に用いるシート状正極では
、二酸化マンガンを主成分とする正極活物質に、この正
極活物質に対して５０〜７０重Ｑ％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、正極活物質に対して５〜１０重量％の粘
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、最少に屹燥する等の手順が
採られる。When producing a sheet-like electrode as described above, for example, in a sheet-like positive electrode used for a lithium-manganese dioxide battery, etc., 50 to 70 weight Q% of the positive electrode active material is added to the positive electrode active material whose main component is manganese dioxide. After adding water and kneading for a certain period of time, a Teflon aqueous dispersion as a binder and water for adjusting the viscosity of 5 to 10% by weight based on the positive electrode active material are added simultaneously, and this is further kneaded to form a slurry. The steps include preparing a positive electrode mixture, applying this slurry positive electrode mixture to a porous current collector, and drying it to a minimum.
〈発明が解決しようとする問題点〉
しかしながら、活物質をテフロン水性ディスパージョン
等と共に上記のように混練してスラリー状合剤とする際
、このスラリー状の最適粘度の幅が非常に狭く、従って
混練時の粘度調整が非常に難しいという問題があり、こ
れが電極の歩留りを低下させる要因となっていた。つま
り、混練時間が長ずきれば粘度が高くなりすぎてスラリ
ーが塊状となり、多孔性集電体への塗着効率が激減し、
また塗着後には合剤の濃淡部ができて電極厚みにバラツ
キがでるし、また混練時間が短い場合は液状で流動性が
高いスラリーとなって、多孔性集電体への塗着が困難に
なり、いずれの場合も均一なシート状電極の作製が困難
で、精度の良いシート状電極を１ｑることかできないか
らである。<Problems to be Solved by the Invention> However, when the active material is kneaded with Teflon aqueous dispersion etc. to form a slurry mixture as described above, the optimum viscosity range of this slurry is very narrow. There was a problem in that it was very difficult to adjust the viscosity during kneading, which was a factor in reducing the yield of electrodes. In other words, if the kneading time is too long, the viscosity will become too high and the slurry will become lumpy, drastically reducing the coating efficiency on the porous current collector.
In addition, after coating, the mixture will have dark and light areas, resulting in variations in electrode thickness, and if the kneading time is short, it will become a liquid slurry with high fluidity, making it difficult to coat onto porous current collectors. In either case, it is difficult to produce a uniform sheet-like electrode, and only 1 q of highly accurate sheet-like electrodes can be produced.
く問題点を解決するための手段〉
以上の問題に鑑みなれさたこの発明は、正極活物質と、
バインダーとしてのテフロン水性ディスパージョンに、
このテフロン水性ディスパージョンに対して２０重量％
以上のアルコールを加え混練してクリーム状とした該ク
リーム状バインダーと水とを加え練合してこのクリーム
状バインダー中のテフロン粒子を分散させ且つこの混合
物の粘度を調整し、こうして１ｑられた合剤を、ローラ
による加圧成形や押出し成形等でシート状に彫型し、こ
のシート状合剤を多孔性集電体に塗着することを要旨と
するシート状電極の製造方法である。Means for Solving the Problems This invention was made in view of the above problems, and the present invention is based on a positive electrode active material,
Teflon aqueous dispersion as a binder,
20% by weight of this Teflon aqueous dispersion
The creamy binder made into a cream by adding the above alcohol and kneading is mixed with water to disperse the Teflon particles in this creamy binder, and the viscosity of this mixture is adjusted. This is a method for producing a sheet-like electrode, the gist of which is to mold the mixture into a sheet by pressure molding using a roller, extrusion molding, etc., and then apply this sheet-like mixture to a porous current collector.
上記のアルコールとしては、低沸点アルコールが好まし
く、例えばエチルアルコール、メチルアルコール、プロ
ピルアルコールなどが挙げられる。The above-mentioned alcohol is preferably a low-boiling alcohol, such as ethyl alcohol, methyl alcohol, propyl alcohol, and the like.
そしてこのようにアルコールを添加することで、バイン
ダーでおるテフロン水性ディスパージョン中のテフロン
粒子がアルコールによって繊維状に変化し、そのバイン
ダー効果が向上して上記合剤に延展性が付与されるよう
になり、均一で薄いシート状合剤を作製し１ｑるように
なる。By adding alcohol in this way, the Teflon particles in the aqueous Teflon dispersion that is a binder are changed into fibers by the alcohol, and the binder effect is improved, giving spreadability to the mixture. As a result, a uniform and thin sheet-like mixture is produced and weighs 1q.
アルコールの添加量はテフロン水性ディスパージョンに
対して２０〜４５重ｆｉ％が好ましい。The amount of alcohol added is preferably 20 to 45% by weight based on the Teflon aqueous dispersion.
アルコールの添加量が２０重皇％以下であるとクリーム
状にならずバインダー効果が得られない。また例えば４
５重量％以上添加した場合でもクリーム状化するが、ク
リーム状化するに必要な母は２０〜４５重量であり、そ
れ以上添加しても過剰分のアルコールが遊離し液状で存
在するだけであり、効果は期待できない。If the amount of alcohol added is less than 20%, the product will not become creamy and no binder effect will be obtained. For example, 4
Even if it is added in an amount of 5% by weight or more, it will become creamy, but the amount of alcohol required to make it creamy is 20 to 45% by weight, and even if more than that is added, the excess alcohol will only be liberated and exist in liquid form. , the effect cannot be expected.
また、テフロン水性ディスパージョンの使用量は、この
テフロン水性ディスパージョンと活゛物質との合計量の
２〜１５重量％の範囲とするのが好ましく、これより少
ないとバインダー効果が弱く合剤同志あるいは合剤と多
孔性集電体との結着強度が低く、剥れ、塗りムラ等が発
生し、また多い場合は活物質含有量の低下による容量低
下及び内部抵抗が増大し、性能低下をぎたす。Further, the amount of Teflon aqueous dispersion used is preferably in the range of 2 to 15% by weight of the total amount of this Teflon aqueous dispersion and the active substance; if it is less than this, the binder effect is weak and the mixture may The bonding strength between the mixture and the porous current collector is low, resulting in peeling, uneven coating, etc., and when the amount is high, the capacity decreases and internal resistance increases due to a decrease in the active material content, resulting in a decrease in performance. vinegar.
一方、上記混練後に合剤に加える水の量については、こ
の混練前に加えるアルコールの重量％が全水分の２〜２
５重量％になる量とするのが好ましい。この範囲より多
すぎれば粘度不足となり、少なければ粘度が上がりすぎ
て混練侵の多孔性集電体への塗着効率が極めて低下し、
いずれの場合も均一なシート状合剤の作製が難しくなる
。On the other hand, regarding the amount of water added to the mixture after the above-mentioned kneading, the weight percent of the alcohol added before this kneading is 2 to 2% of the total water content.
Preferably, the amount is 5% by weight. If the amount exceeds this range, the viscosity will be insufficient, and if it is less than this range, the viscosity will increase too much and the efficiency of coating the porous current collector during kneading will be extremely reduced.
In either case, it becomes difficult to produce a uniform sheet-like mixture.
そして、上記のような水分母の水でこのクリーム状バイ
ンダーと活物質とを練合することで、練合後の合剤を押
出し成形等によりシート状に成形するのに適した硬さ、
例えば水分含有量５ｉｔ％程度とすることができる。By kneading the creamy binder and the active material with water as the water matrix described above, the kneaded mixture has a hardness suitable for forming into a sheet by extrusion molding, etc.
For example, the water content can be about 5 it%.
また、上記クリーム状バインダー作製時、その雰囲気温
度により大きく影響をうけるため、この混練を行なう混
合槽内の温度を２０℃以上とするのが好ましい。これよ
り低い温度例えば１０℃程度でも反応は起こるが、その
スピードが極めて遅く、作業性が著しく低下するからで
ある。この雰囲気温度の上限は、上記添加するアルコー
ルの種類等により異なるが、いずれの場合でも、６０℃
程度でおれば不都合はない。Furthermore, since the preparation of the creamy binder is greatly affected by the ambient temperature, it is preferable that the temperature in the mixing tank in which kneading is performed is 20° C. or higher. Although the reaction occurs at a lower temperature, for example, about 10° C., the speed is extremely slow and workability is significantly reduced. The upper limit of this atmospheric temperature varies depending on the type of alcohol added, etc., but in any case, it is 60°C.
There is no problem as long as it is within the range.
また、上記クリーム状バインダーを作るとき、作業雰囲
気温度が重大な管理条件として関係し、作業性向上の点
から、２０℃以上、好ましくは２０〜６０℃で行なう必
要がある。つまり、作業雰囲気温度が２０℃以下、例え
ば１５℃程度であるとテフロン粒子の凝集が非常にゆっ
くりとしたものとなり、クリーム状とする為に長時間を
要するし、また更に低い温度では凝集がほとんど起こら
なくなってクリーム状とすることができなくなるからで
ある。Further, when producing the above-mentioned creamy binder, the temperature of the working atmosphere is an important control condition, and from the viewpoint of improving workability, it is necessary to carry out the process at a temperature of 20°C or higher, preferably 20 to 60°C. In other words, if the working atmosphere temperature is below 20℃, for example around 15℃, Teflon particles will coagulate very slowly and it will take a long time to form a cream-like product, and if the temperature is even lower, the aggregation will hardly occur. This is because it will not occur and it will not be possible to make it creamy.
更に、アルコールを加え混練してテフロン粒子を完全に
凝集させてクリーム状のバインダーとした俊、−度に大
量の水を加えた場合、凝集していたテフロンの分散が非
常に悪くなり、きれいに分散させることができないこと
が多い。Furthermore, when alcohol is added and kneaded to completely agglomerate the Teflon particles and create a cream-like binder, when a large amount of water is added at the same time, the dispersion of the coagulated Teflon becomes very poor, and it becomes difficult to disperse it neatly. It is often impossible to do so.
そこで、クリーム状バインダーを添加した後まず一次水
（分散用）を加えて練合わせてまず分散させ、その後二
次水（粘度調整用）を加えて一定の粘度にするようにし
ても良い。この一次水、二次水の割合は、前記水のそれ
ぞれ６０〜９０重量％、１０〜４０重量％とするのが良
いことが知得されている。Therefore, after adding the creamy binder, primary water (for dispersion) may be added and kneaded to first disperse, and then secondary water (for viscosity adjustment) may be added to adjust the viscosity to a certain level. It is known that the proportions of the primary water and secondary water are preferably 60 to 90% by weight and 10 to 40% by weight of the water, respectively.
また、この水に代えて上記と同質のアルコールを用いる
ようにしても良い。このアルコールの使用母は上記の水
の使用Ｉと同様である。そして、この場合、先に添加し
たアルコールによりテフロンは既に凝集しており、ここ
で加えるアルコールは、分散と粘度調整用としての役割
となる。そして、このように水に代えてアルコールを用
いることで、低い温度で分散媒であるアルコールを合剤
から蒸発させることができ、その分、シート状合剤を多
孔性集電体に塗着した後の合剤乾燥工程の時間が短縮化
される。Further, in place of this water, alcohol of the same quality as above may be used. The use of this alcohol is the same as the use of water I above. In this case, Teflon has already coagulated due to the alcohol added earlier, and the alcohol added here serves as a dispersion and viscosity adjustment agent. By using alcohol instead of water in this way, the dispersion medium alcohol can be evaporated from the mixture at a low temperature, which makes it possible to apply the sheet-like mixture to the porous current collector. The time required for the subsequent mixture drying step is shortened.
く作 用〉
上記のように、活物質とテフロン水性ディスパージョン
にアルコールを加え混練して得たクリーム状バインダー
と水もしくはアルコールを加え練合して分散性に富む正
極合剤を得、次いで水もしくはアルコールを加え練合し
正極合剤の粘度を調整する方法を用いることで、合剤の
粘度調整が容易化する。そして、その後、ローラ成形や
押出し成形等でこの合剤からシート状合剤を作るといっ
た方法を採ることで、均一で精度の良い電極が容易且つ
歩留り良く作製することができる。Function> As mentioned above, a creamy binder obtained by adding alcohol to the active material and Teflon aqueous dispersion and kneading is mixed with water or alcohol to obtain a highly dispersible cathode mixture, and then mixed with water or alcohol. Alternatively, the viscosity of the positive electrode mixture can be easily adjusted by adding alcohol and kneading to adjust the viscosity of the positive electrode mixture. Thereafter, by forming a sheet-like mixture from this mixture by roller molding, extrusion molding, etc., uniform and precise electrodes can be easily manufactured with a high yield.
〈実施例〉 夫血■ユ 以下にこの発明の実施例を詳細に説明する。<Example> husband's blood Examples of the present invention will be described in detail below.
正極活物質である二酸化マンガン１００重量部に、鱗状
黒鉛６重量部とカーボンブラック３重回部とを導電剤と
して混合して正極活物質を作った。一方、２０℃以上に
保温したテフロン水性ディスパージョン５重量部とアル
コール（エチルアルコール）２重量部とを混合しこれら
を作業雰囲気温度２５℃において混練した。混練と共に
テフロン粒子が凝集してクリーム状を呈した。A positive electrode active material was prepared by mixing 100 parts by weight of manganese dioxide, which is a positive electrode active material, with 6 parts by weight of scaly graphite and 3 parts of carbon black as a conductive agent. On the other hand, 5 parts by weight of Teflon aqueous dispersion kept at a temperature of 20°C or higher and 2 parts by weight of alcohol (ethyl alcohol) were mixed and kneaded at a working atmosphere temperature of 25°C. As the mixture was kneaded, the Teflon particles agglomerated to form a cream-like mixture.
上記正極活物質と上記クリーム状バインダーと１１重量
部の一次水を加え０．５時間−次練合して合剤中のテフ
ロン粒子を分散させ、次いで２重量部の二次水を加え二
次練合して正極合剤の粘度を調整した。The above positive electrode active material, the above creamy binder, and 11 parts by weight of primary water were added and kneaded for 0.5 hours to disperse the Teflon particles in the mixture, and then 2 parts by weight of secondary water was added and mixed. The viscosity of the positive electrode mixture was adjusted by kneading.
その後、この正極合剤を押出し成形により厚さ０．３ｍ
ｍのシート状に成形し、このシート状正極合剤をステン
レス製の多孔性導電体に圧着し、次いで乾燥させて、本
発明のシート状正極を作製した。このシート状正極は、
均一なシー１〜であった。After that, this positive electrode mixture was extruded to a thickness of 0.3 m.
This sheet-like positive electrode mixture was pressed onto a porous conductor made of stainless steel, and then dried to produce a sheet-like positive electrode of the present invention. This sheet-like positive electrode is
It had a uniform sea level of 1~.
そして、このようにして作ったシート状正極を、微孔性
フィルムを用いてなるセパレータを介在させて、同じく
シート状の負極（リチウム）と積重し、且つこれらを一
緒に渦巻状に巻回して発電要素を作製し、また有底円筒
状の電池缶内にこの発電要素を収納するなどして、第１
図に示したような本発明に係わるリチウムー二酸化マン
ガン電池（本発明品）を作製した。この添付図面におい
て、１，２はそれぞれ正極、負極、３はセパレータ、４
は発電要素、５は電池缶、６は絶縁板、７は絶縁ガスケ
ット、８，９はそれぞれ正極リード板、負極リード板、
１０は端子板である。The sheet-shaped positive electrode thus produced is then stacked with a sheet-shaped negative electrode (lithium) with a separator made of microporous film interposed therebetween, and these are then spirally wound together. The first power generation element is manufactured by using
A lithium-manganese dioxide battery (product of the present invention) according to the present invention as shown in the figure was produced. In this attached drawing, 1 and 2 are a positive electrode and a negative electrode, respectively, 3 is a separator, and 4
is a power generation element, 5 is a battery can, 6 is an insulating plate, 7 is an insulating gasket, 8 and 9 are a positive electrode lead plate, a negative electrode lead plate, respectively,
10 is a terminal board.
一方、同様な正極活物質１００重量部に、４８重量部の
水を加え、一定時間混練した後、テフロン水性ディスパ
ージョン６重量部と粘度調整用の水２０重量部とを同時
に加え、混練してスラリー状の正極合剤を作った。次い
で、このスラリー状正極合剤をステンレス製の多孔性導
電体に塗着し、乾燥するなどして、従来のシート状正極
を作った。On the other hand, 48 parts by weight of water was added to 100 parts by weight of the same positive electrode active material, and after kneading for a certain period of time, 6 parts by weight of Teflon aqueous dispersion and 20 parts by weight of water for viscosity adjustment were simultaneously added and kneaded. A slurry-like positive electrode mixture was made. Next, this slurry-like positive electrode mixture was applied to a stainless steel porous conductor and dried, to produce a conventional sheet-like positive electrode.
この従来のシート状正極を目視にて観察した所、濃淡部
があり、またシート各部の厚さにバラツキがみられた。When this conventional sheet-like positive electrode was visually observed, it was found that there were dark and dark areas, and there were variations in the thickness of each part of the sheet.
また、本発明品と、上記従来のシート状正極を用いた他
は本発明品と同様な比較量の電池をそれぞれ１００個づ
つ作り、その歩留りを求めた所、下表の通りであった。In addition, 100 batteries of the present invention and comparative batteries similar to the present invention except that the conventional sheet positive electrode was used were made, and the yields were determined as shown in the table below.
Ｘ血■２
また、上記と同じ正極活物質と、この正極活物質との合
計量の２〜１５％となる範囲のテフロン水性ディスパー
ジョンに、このテフロン水性ディスパージョンに対して
２０〜４５重量％の範囲となる母のアルコールとを加え
混練して、クリーム状にした該クリーム状バインダーと
、上記アルコールの重ω％の２〜２５重量％となる母の
水を加え、作業雰囲気温度２０〜６０℃において、これ
らを練合し、その後、押出し成形、並びにローラ成形に
より、シー１〜状の正極合剤を種々作製した。これらシ
ート状の正極合剤をそれぞれ、多孔性導電体に塗着し、
次いで乾燥させて、本発明に係わるシート状正極を作製
した。X Blood ■2 In addition, the same positive electrode active material as above and a Teflon aqueous dispersion in a range of 2 to 15% of the total amount of this positive electrode active material, and 20 to 45% by weight of this Teflon aqueous dispersion. The cream-like binder is made into a cream by adding and kneading the mother alcohol in the range of 2 to 25% by weight of the above-mentioned alcohol, and the working atmosphere temperature is 20 to 60%. These were kneaded at ℃, and then extrusion molding and roller molding were used to produce various positive electrode mixtures in the shapes of C1-1. Each of these sheet-shaped positive electrode mixtures is applied to a porous conductor,
Then, it was dried to produce a sheet-like positive electrode according to the present invention.
一方、テフロン水性ディスパージョン、アルコールの重
量％を上記の範囲よりそれぞれ少なく、おるいは多くし
た他は同様にして、種々の正極合剤を作った。On the other hand, various positive electrode mixtures were prepared in the same manner except that the weight percentages of Teflon aqueous dispersion and alcohol were respectively lowered or increased from the above ranges.
これらの正極合剤に、上記の範囲より少ないか、あるい
は多いｆｆｌｆｆｉ％の水を加え、上記と同様に練合し
、次いでシート状の正極合剤に成形した。To these positive electrode mixtures, fffffi% of water less than or greater than the above range was added, kneaded in the same manner as above, and then formed into a sheet-like positive electrode mixture.
そして、これらのシート状正極合剤をそれぞれ、多孔性
導電体に塗着し、次いで乾燥させて、比較用のシート状
正極をそれぞれ作製した所、これら比較用のシート状正
極では、クリーム状に混練する際のテフロン粒子の分散
がうまくいかなかったり、あるいは均一なシート状に成
形するのが困難であった。Each of these sheet-like positive electrode mixtures was applied to a porous conductor and then dried to prepare sheet-like positive electrodes for comparison. The Teflon particles were not well dispersed during kneading, or it was difficult to form them into a uniform sheet.
本発明に係るシート状正極の歩留りは９５％であり良好
であったが、その他のシート状正極の歩留りは８７±２
％であり、歩留り向上は望めない。The yield of the sheet positive electrode according to the present invention was 95%, which was good, but the yield of other sheet positive electrodes was 87±2.
%, and no improvement in yield can be expected.
〈発明の効果〉
以上のようにこの発明のシート状電極の製造方法によれ
ば、合剤の粘度調整が容易化し、また均一で精度の良い
電極が容易且つ歩留り良く作製することができる。<Effects of the Invention> As described above, according to the method for producing a sheet-like electrode of the present invention, the viscosity of the mixture can be easily adjusted, and a uniform and precise electrode can be produced easily and with a high yield.
第１図はこの発明の実施例の電池の断面図である。
１・・・正極、３・・・セパレータ、４・・・発電要素
、５・・・電池缶。FIG. 1 is a sectional view of a battery according to an embodiment of the invention. 1...Positive electrode, 3...Separator, 4...Power generation element, 5...Battery can.
Claims (1)
水性ディスパージョンに、テフロン水性ディスパージョ
ンに対して２０重量％以上のアルコールを加え混練しク
リーム状としたテフロン水性ディスパージョンと、水と
を加え練合して得られた合剤をシート状に成形し、この
シート状合剤を多孔性集電体に塗着することを特徴とす
るシート状電極の製造方法。 ２、前記水は、前記アルコールの重量％が全水分量の２
〜２５重量％になる量であることを特徴とする特許請求
の範囲第１項記載の製造方法。 ３、前記活物質とクリーム状としたテフロン水性ディス
パージョンの混合物と一次水を加え練合し、その後二次
水を加え練合して得られた合剤を、シート状に成形する
ことを特徴とする特許請求の範囲第１項または第２項記
載の製造方法。 ４、前記一次水は、前記水の６０〜９０重量で、また前
記二次水は、前記水の１０〜４０重量％であることを特
徴とする特許請求の範囲第３項記載の製造方法。 ５、前記水の代わりに、アルコールを用いることを特徴
とする特許請求の範囲第１項または第２項記載の製造方
法。 ６、前記テフロン水性ディスパージョンとアルコールと
の混練時における雰囲気が２０℃以上であることを特徴
とする特許請求の範囲第１項記載の製造方法。 ７、前記テフロン水性ディスパージョンが、このテフロ
ン水性ディスパージョンと前記活物質との合計量の２〜
１５重量％であることを特徴とする特許請求の範囲第１
項記載の製造方法。[Claims] 1. A Teflon aqueous dispersion made into a cream by adding alcohol of 20% by weight or more to the Teflon aqueous dispersion and kneading an active material whose main component is manganese dioxide and a Teflon aqueous dispersion. A method for producing a sheet-like electrode, comprising: forming a mixture obtained by kneading and kneading the mixture with water into a sheet, and applying the sheet-like mixture onto a porous current collector. 2. The water is such that the alcohol has a weight percent of 2 of the total water content.
The method according to claim 1, characterized in that the amount is 25% by weight. 3. A mixture of the active material and creamy Teflon aqueous dispersion is added and kneaded with primary water, and then secondary water is added and kneaded to form the resulting mixture into a sheet shape. A manufacturing method according to claim 1 or 2. 4. The manufacturing method according to claim 3, wherein the primary water is 60 to 90% by weight of the water, and the secondary water is 10 to 40% by weight of the water. 5. The manufacturing method according to claim 1 or 2, characterized in that alcohol is used instead of the water. 6. The manufacturing method according to claim 1, wherein the atmosphere during kneading of the Teflon aqueous dispersion and alcohol is 20° C. or higher. 7. The Teflon aqueous dispersion contains 2 to 20% of the total amount of the Teflon aqueous dispersion and the active material.
Claim 1 characterized in that the amount is 15% by weight.
Manufacturing method described in section.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63031612A JPH0638337B2 (en) | 1988-02-13 | 1988-02-13 | Method for manufacturing sheet electrode |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63031612A JPH0638337B2 (en) | 1988-02-13 | 1988-02-13 | Method for manufacturing sheet electrode |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH01206563A true JPH01206563A (en) | 1989-08-18 |
| JPH0638337B2 JPH0638337B2 (en) | 1994-05-18 |
Family
ID=12336029
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63031612A Expired - Lifetime JPH0638337B2 (en) | 1988-02-13 | 1988-02-13 | Method for manufacturing sheet electrode |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0638337B2 (en) |
-
1988
- 1988-02-13 JP JP63031612A patent/JPH0638337B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0638337B2 (en) | 1994-05-18 |
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