POSITIVE ELECTRODE PASTE FOR BATTERY

• Main Authors: YAMAMOTO DAISUKE, UEMATSU SHINYA, YANO TAKAHIRO, KUWABARA KAZUO, SAMATA MITSUHIKO
• Format: Patent
• Language: English; Japanese
• Published: 01.11.2018
• Subjects: BASIC ELECTRIC ELEMENTS; CHEMISTRY; COMPOSITIONS BASED THEREON; ELECTRICITY; MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVINGCARBON-TO-CARBON UNSATURATED BONDS; METALLURGY; ORGANIC MACROMOLECULAR COMPOUNDS; PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY; THEIR PREPARATION OR CHEMICAL WORKING-UP

PROBLEM TO BE SOLVED: To provide a positive electrode paste for a battery, which enables formation of a positive electrode less in elution of a dispersant into electrolyte solution.SOLUTION: A positive electrode paste for a battery according to one embodiment of the present invention comprises a positive electrode active material, a conducting agent, a binding agent, a copolymer and a dispersant. The copolymer contains a constituting unit (a) represented by a formula (1), a constituting unit (b) represented by a formula (2), and a constituting unit (c) represented by a formula (3). In the copolymer, the content of the constituting unit (c) is 15 mass% or more and 45 mass% or less. In the formulas (1) to (3), R, R, R, R, R, R, R, R, Rand Rindividually and independently represent a hydrogen atom, a methyl group or an ethyl group; Ris a monovalent carbon hydride group with C8-30; Ris a straight or branched chain alkylene group with C2-4; and p is a number of 1-50.SELECTED DRAWING: None 【課題】電解液への分散剤の溶出が少ない正極を形成することができる電池用正極ペーストを提供する。【解決手段】本発明の一態様は、正極活物質、導電剤、結着剤、共重合体及び分散媒を含み、上記共重合体が、下記式（１）で表される構成単位（ａ）、下記式（２）で表される構成単位（ｂ）及び下記式（３）で表される構成単位（ｃ）を含有し、上記共重合体中の上記構成単位（ｃ）の含有量が、１５質量％以上４５質量％以下である電池用正極ペーストである。式（１）〜（３）中、Ｒ１、Ｒ２、Ｒ３、Ｒ５、Ｒ６、Ｒ７、Ｒ９、Ｒ１０、Ｒ１１、及びＲ１２は、それぞれ独立して、水素原子、メチル基又はエチル基である。Ｒ４は、炭素数８〜３０の１価の炭化水素基である。Ｒ８は、炭素数２〜４の直鎖状又は分岐状のアルキレン基である。ｐは、１〜５０の数である。【選択図】なし