JPS63138645A - Positive electrode for battery - Google Patents

Positive electrode for battery

Info

Publication number
JPS63138645A
JPS63138645A JP61281988A JP28198886A JPS63138645A JP S63138645 A JPS63138645 A JP S63138645A JP 61281988 A JP61281988 A JP 61281988A JP 28198886 A JP28198886 A JP 28198886A JP S63138645 A JPS63138645 A JP S63138645A
Authority
JP
Japan
Prior art keywords
positive electrode
electrolytic solution
electrolyte
battery
open holes
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
JP61281988A
Other languages
Japanese (ja)
Inventor
Kazuma Kumai
熊井　一馬
Nobuyuki Terada
寺田　信之
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.)
Central Research Institute of Electric Power Industry
Original Assignee
Central Research Institute of Electric Power Industry
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 Central Research Institute of Electric Power Industry filed Critical Central Research Institute of Electric Power Industry
Priority to JP61281988A priority Critical patent/JPS63138645A/en
Publication of JPS63138645A publication Critical patent/JPS63138645A/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
    • H01M4/04—Processes of manufacture in general
    • 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
    • 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
    • H01M4/043—Processes of manufacture in general involving compressing or compaction
    • H01M4/0433—Molding
    • 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
    • H01M4/0438—Processes of manufacture in general by electrochemical processing
    • H01M4/0459—Electrochemical doping, intercalation, occlusion or alloying
    • 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
    • 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
    • H01M2004/026—Electrodes composed of, or comprising, active material characterised by the polarity
    • H01M2004/028—Positive electrodes
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M2300/00—Electrolytes
    • H01M2300/0017—Non-aqueous electrolytes
    • H01M2300/0025—Organic electrolyte
    • 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)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Battery Electrode And Active Subsutance (AREA)

Abstract

PURPOSE:To facilitate the infiltration of an electrolytic solution into open holes and increase the output by molding a positive electrode forming material mixed with the electrolytic solution or an electrolyte so as to form open holes. CONSTITUTION:An electrolytic solution or an electrolyte 7 is mixed and kneaded with an electrode active material 4 serving as a positive electrode forming material, binder 6, and a current collector 5 to mold a positive electrode 2. The surface of a current collecting plate 9 is coated with a hard paste 8, then a plate 10 hardly stuck with the paste 8 is mounted on it, and the pressure 11 capable of generating necessary open holes is applied from the above to compress and mold it. Since the electrolytic solution or the electrolyte is kneaded together with the conventional positive electrode forming material, open holes are well wetted by the electrolytic solution, the electrolytic solution and the electrolyte easy to be wetted exist on open holes, thus the electrolytic solution easily infiltrates into the positive electrode when a battery is constituted. Accordingly, the contact face between lithium ions and the electrode active material 4 is increased and intercalation is facilitated, and the output of the battery is increased.

Description

【発明の詳細な説明】 （産業上の利用分野） 本発明は電池の正電極、特に反応表面積の増大に関する
ものである。DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to battery positive electrodes, and in particular to increasing the reactive surface area.

（従来技術とその問題点） エネルギ密度の高い２次電池として、次のようなものが
開発されている。即ち、リチウムを負極とし、また正極
として電極活物質である硫化物や金属酸化物例えば硫化
モリブデンと、集電体であるカーボンブラック、および
バインダであるＰＴＦＥ（テフロン）を例えば８：１：
１の割合で混合したのち圧縮成型したものを用いる。そ
してこれら負電極（１１と正電極（２）とを、例えば第
１図のように電解液を含浸させたセパレータ（３）を介
して対向させた、所謂リチウムインターカレーション電
池が開発されている。(Prior art and its problems) The following types of secondary batteries with high energy density have been developed. That is, lithium is used as a negative electrode, and as a positive electrode, an electrode active material such as sulfide or metal oxide such as molybdenum sulfide, carbon black as a current collector, and PTFE (Teflon) as a binder are mixed at a ratio of, for example, 8:1.
The mixture is mixed at a ratio of 1:1 and then compression molded. A so-called lithium intercalation battery has been developed in which the negative electrode (11) and the positive electrode (2) are opposed to each other via a separator (3) impregnated with an electrolytic solution, as shown in FIG. .

ところで電池出力を大きくするためには、正極の表面積
を大きくし、電解液と電極活物質の接触面積を大きくし
て、リチウムイオンによる電極活物質のインターカレー
ト量を多くすることが必要である。By the way, in order to increase battery output, it is necessary to increase the surface area of the positive electrode, increase the contact area between the electrolyte and the electrode active material, and increase the amount of intercalation of the electrode active material by lithium ions. .

そこで従来においては、ペースト状正電極材の成型時に
その成型圧力を制御して、電極内の電解液の浸透を容易
にする開空孔を多く作るようにしたり、或いは多孔質体
を用いる方法により、正電極の反応表面積を大にする方
法が提案されている。Therefore, in the past, the molding pressure was controlled during molding of the paste-like positive electrode material to create many open pores that facilitate the permeation of the electrolyte within the electrode, or a method using a porous material was used. , a method of increasing the reaction surface area of the positive electrode has been proposed.

しか上記のように形成された開空孔は、成型時の雰囲気
ガスや保存中の雰囲気ガス等で埋められて電解液が入り
こみにくいため、反応表面積の増大は極めて不十分であ
る。そこで例えば電池に組込んだのち減圧して、開空孔
中のガスを脱気する方法がとられているが、十分に脱気
できないのが現状であり、この方法によっても電池出力
の増大は不十分である。However, the open pores formed as described above are filled with atmospheric gas during molding and during storage, making it difficult for the electrolyte to enter, so that the reaction surface area is extremely insufficiently increased. Therefore, for example, a method is used to degas the gas in the open pores by reducing the pressure after incorporating it into a battery, but at present it is not possible to fully degas the gas, and even with this method, the battery output cannot be increased. Not enough.

（発明の目的） 本発明は開学孔中への電解液の浸透が容易である正電極
を提供し、出力の大きい電池の実現を図ったものである
。(Objective of the Invention) The present invention aims to provide a positive electrode in which an electrolytic solution can easily penetrate into the opening hole, and to realize a battery with high output.

（問題点を解決するための本発明の手段）本発明の特徴
とするところは、電解液や電解質を正電極形成材である
電極活物質、バインダ、集電体などと混合して一緒に練
り込んで正電極を成型した点にある０例えば第２図（ａ
ｌのように正電極物質である硫化モリブデン（４）と、
集電体であるカーボンブラック（５）、およびバインダ
であるＰＴＦＥ（テフロン）（６）をＳ：ｔ：ｔの割合
で混合したものに、電解質であるプロピレンカーボネー
ト（７）を加えて、十分攪拌混合して硬いペースト（８
）を作る。(Means of the present invention for solving problems) The present invention is characterized by mixing an electrolytic solution or an electrolyte with positive electrode forming materials such as an electrode active material, a binder, a current collector, etc., and kneading the mixture together. For example, in Figure 2 (a
Molybdenum sulfide (4), which is a positive electrode material as shown in l,
Propylene carbonate (7) as an electrolyte is added to a mixture of carbon black (5) as a current collector and PTFE (Teflon) (6) as a binder in a ratio of S:t:t and stirred thoroughly. Mix to make a hard paste (8
)make.

そしてこれを第２図（ｂ）に示すように集電板（９）の
面上に塗布したのち、その上に第２図（Ｃ）のようにペ
ースト（８）の付着しにくい板α０を置いて、その上か
ら所要の開空孔を作りうるような圧力αυを加えて圧縮
成型したものである。After applying this on the surface of the current collector plate (9) as shown in Fig. 2(b), a plate α0 to which the paste (8) does not easily adhere is placed on top of it as shown in Fig. 2(C). It is then compression molded by applying a pressure αυ that can create the required open pores.

（発明の作用・効果） 本発明では以上のように電解液や電解質が従来の正電極
形成材と一緒に練り込まれるため、開空孔が電解液によ
ってよく濡れる。また電解液と濡れ易い電解質が開空孔
面に存在するので、電池を構成したとき、電解液が正電
極内へ容易に浸透する。従ってリチウムイオンと電極活
物質との接触面が大となってインターカレートが容易と
なり、その結果として電池の出力の増大が図られる。次
にその実験結果について示す。前記第２図によって説明
したようにして成型された本発明正電極を、不活性ガス
中に放置したのち、型くずれしないことを確かめて、リ
チウム負極と組合わせて電池を組み、最後に電解液に浸
漬した状態で電池全体を減圧下にさらした電池と、従来
方法により作られた電池とを比較観察した。その結果本
発明による場合は従来のものに比べて正電極からの泡の
発生は極めて少なく、電解液との濡れ具合も良好である
ことが判った。(Operations and Effects of the Invention) In the present invention, as described above, the electrolytic solution and electrolyte are kneaded together with the conventional positive electrode forming material, so that the open pores are well wetted by the electrolytic solution. Furthermore, since the electrolyte that is easily wetted with the electrolyte exists on the open pore surface, the electrolyte easily permeates into the positive electrode when a battery is constructed. Therefore, the contact surface between the lithium ions and the electrode active material becomes large, facilitating intercalation, and as a result, the output of the battery is increased. Next, the experimental results will be shown. The positive electrode of the present invention, which was molded as explained in FIG. Comparative observations were made between a battery that was immersed and exposed to reduced pressure, and a battery that was made using a conventional method. As a result, it was found that in the case of the present invention, the generation of bubbles from the positive electrode was extremely small compared to the conventional one, and the degree of wetting with the electrolyte was also good.

以上本発明をリチウム電池を例にとって説明したが、他
の２次電池、１次電池にも適用して同様の効果を挙げる
ことができる。Although the present invention has been described above using a lithium battery as an example, it can be applied to other secondary batteries and primary batteries to achieve similar effects.

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

第１図はリチウム２次電池の構成概略斜視図、第２図は
本発明による正電極の製造工程図である。 （１）・・・負電極、　（２）・・・正電極、　（３）
・・・セパレータ、（４）・・・硫化モリブデン（電極
活物質）、　（５）・・・カーボンブラック（集電体）
、　（６）・・・ＰＴＦＥ　（バインダ）、（７）・・
・プロピレンカーボネート（電解質）、（８）・・・ペ
ースト、　（９）・・・集電板、　Ｑｌ・・・電力印加
板。FIG. 1 is a schematic perspective view of the structure of a lithium secondary battery, and FIG. 2 is a process diagram for manufacturing a positive electrode according to the present invention. (1)...Negative electrode, (2)...Positive electrode, (3)
Separator, (4) Molybdenum sulfide (electrode active material), (5) Carbon black (current collector)
, (6)...PTFE (binder), (7)...
- Propylene carbonate (electrolyte), (8)... Paste, (9)... Current collector plate, Ql... Power application plate.

Claims (1)

【特許請求の範囲】[Claims] 　正電極形成材に電解液または電解質を混合したものを
、開空孔を作るように成型したことを特徴とする電池の
正電極。A positive electrode for a battery, characterized in that a positive electrode forming material mixed with an electrolyte or an electrolyte is molded to form open pores.
JP61281988A 1986-11-28 1986-11-28 Positive electrode for battery Pending JPS63138645A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP61281988A JPS63138645A (en) 1986-11-28 1986-11-28 Positive electrode for battery

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP61281988A JPS63138645A (en) 1986-11-28 1986-11-28 Positive electrode for battery

Publications (1)

Publication Number Publication Date
JPS63138645A true JPS63138645A (en) 1988-06-10

Family

ID=17646670

Family Applications (1)

Application Number Title Priority Date Filing Date
JP61281988A Pending JPS63138645A (en) 1986-11-28 1986-11-28 Positive electrode for battery

Country Status (1)

Country Link
JP (1) JPS63138645A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20100040952A1 (en) * 2007-03-23 2010-02-18 Toyota Jidosha Kabushiki Kaisha Solid state battery and method of producing the same
JP2010532818A (en) * 2007-06-27 2010-10-14 ユニベルシテ ポール ベルレーヌ Method, apparatus and use of the method for selective cation extraction by electrochemical transport in solution

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20100040952A1 (en) * 2007-03-23 2010-02-18 Toyota Jidosha Kabushiki Kaisha Solid state battery and method of producing the same
JP2010532818A (en) * 2007-06-27 2010-10-14 ユニベルシテ ポール ベルレーヌ Method, apparatus and use of the method for selective cation extraction by electrochemical transport in solution

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