Sumitomo Seika Chemicals Co., Ltd.

Nec Corporation

Shun Hashimoto

Shigeyuki Iwasa

Hiroyuki Nishide

Kentaro Nakahara

Nobutaka Fujimoto

Kenichi Oyaizu

Yuki Kono

Koji Fujita

Yuji Kinpara

Junichi Fujishige

Erina Takahashi

Masako Kinno

Yasuhito Ushijima

Naoka Hirabayashi

Sosuke Yamaguchi

Moe Inui

The present invention provides a binder for a secondary battery having excellent binding force. A binder for a secondary battery comprising a polymer compound, wherein the polymer compound contains an acrylic repeating unit, and a 3% by mass aqueous solution of the polymer compound has a yellowness index of 14 or less.

Binder for secondary battery

The present invention provides a method that enables the use of an aqueous solution of a copolymer of vinyl alcohol and an alkali metal neutralized product of ethylenically unsaturated carboxylic acid or carboxymethyl cellulose or a salt thereof, as a binder for secondary batteries, without causing a significant viscosity increase even if stored in the state of an aqueous solution. More specifically, the present invention provides a composition in the form of an aqueous solution containing a copolymer of vinyl alcohol and an alkali metal neutralized product of ethylenically unsaturated carboxylic acid and/or carboxymethyl cellulose or a salt thereof, wherein when the viscosity of the composition after being diluted with water (25° C. or less) to a viscosity of 200±100 mPa·s at room temperature (25° C.) and being adjusted to a temperature of 25° C. is defined as X(Pa·s), and the viscosity of the composition after being placed in an airtight container and being allowed to stand at 95° C. for 8 hours is defined as X(Pa·s), the change rate obtained by the following formula:Change rate (%)=()/×100is 0 to 10%.

Polymer composition

This binder for nonaqueous electrolyte secondary battery electrodes contains: a copolymer of vinyl alcohol and an ethylenically unsaturated carboxylic acid alkali metal neutralized product; and a polyalkylene oxide.

Binder for nonaqueous electrolyte secondary battery electrodes, electrode mixture for nonaqueous electrolyte secondary batteries, electrode for nonaqueous electrolyte secondary batteries, nonaqueous electrolyte secondary battery and electrical device

Provided is a binder for lithium ion secondary battery positive electrodes, which is capable of providing a positive electrode for lithium ion secondary batteries with excellent high-rate discharge characteristics. A binder for lithium ion secondary battery positive electrodes, which contains a binder resin and 500 ppm or less of an oil-soluble radical initiator.

Binder for lithium ion secondary battery positive electrodes

The present invention provides a radical composition capable of suppressing elution of electrode components in an electrolyte solution when used in an electrode for a secondary battery, and a battery using the radical composition. The present invention relates to a radical composition including a pyrroline nitroxide polymer and polyethylene glycols.

Radical composition and battery using same

Growing community of inventors

Hyogo, Japan

Shun Hashimoto