METHOD FOR MANUFACTURING ELECTRODE PLATE

• Main Author: UEZONO TOMOYUKI
• Format: Patent
• Language: English; Japanese
• Published: 25.05.2017
• Subjects: BASIC ELECTRIC ELEMENTS; ELECTRICITY; PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY

PROBLEM TO BE SOLVED: To provide a method for manufacturing an electrode plate, which enables the achievement of both of a high toughness for suppressing the break of a coating film, and a high liquid retentivity for suppressing a transfer failure.SOLUTION: A method for manufacturing an electrode plate having an electrode active material layer on a piece of current collector foil 10 comprises: a wet granulated particle manufacturing step for preparing wet granulated particles 40 by the granulation from electrode active material powder, a binding material and a solvent; and a film formation step for making a film of the wet granulated particles 40 obtained by the wet granulated particle manufacturing step by passing them through a gap between rollers 20 opposed to each other, and depositing the film of the wet granulated particles 40 onto the piece of current collector foil 10. As the binding material, 0.6-0.8 wt% of a polyacrylic acid lithium salt, and 0.1-0.3 wt% of carboxymethyl cellulose are used. The polyacrylic acid lithium salt is a crosslinked type one and has a molecular weight of 200,000 or more.SELECTED DRAWING: Figure 1 【課題】塗膜切れを抑制するための高い靱性と、転写不良を抑制するための高い保液性を両立可能な電極板の製造方法の提供。【解決手段】電極活物質粉末と結着材と溶媒を造粒して湿潤造粒体４０を製作する湿潤造粒体製造工程と、湿潤造粒体製造工程で得られた湿潤造粒体４０を対向するローラ２０の隙間に通すことで膜状化すると共に、膜状化した湿潤造粒体４０を集電箔１０上に付着させる成膜工程とにより、集電箔１０上に電極活物質層を有する電極板を製造する電極板の製造方法において、結着材として、ポリアクリル酸リチウム塩を０．６重量％〜０．８重量％、及びカルボキシメチルセルロースを０．１重量％〜０．３重量％を用い、ポリアクリル酸リチウム塩が分子量２０万以上の架橋型であること。【選択図】図１