POSITIVE ELECTRODE MATERIAL FOR LITHIUM ION SECONDARY BATTERY, POSITIVE ELECTRODE FOR LITHIUM ION SECONDARY BATTERY, AND LITHIUM ION SECONDARY BATTERY

Japanese Patent JP2015069822

A

PROBLEM TO BE SOLVED: To provide a positive electrode material for a lithium ion secondary battery capable of securing both electronic conductivity at a small amount of binder and binding properties of a positive electrode active material between the positive electrode active materials and to a current collector using secondary particles formed by granulating primary particles forming a carbonaceous film, also to provide a positive electrode for a lithium ion secondary battery for securing electronic conductivity and bonding properties of the positive electrode active material by using such a positive electrode material for a lithium ion secondary battery, and also to provide a lithium ion secondary battery having excellent physical properties by using such a positive electrode for a lithium ion secondary battery.SOLUTION: A positive electrode material for a lithium ion secondary battery includes: a positive electrode active material whose average pore diameter is 10 nm to 300 nm; a binder including polyvinylidene fluoride having a weight average molecular weight of 500,000-1,500,000; and a conductive assistant.

YAMAYA RYUTA
KITAGAWA TAKARO
YAMAMOTO YOSHITAKA
KYUSEKI HIROSHI

JP2013202595A

April 13, 2015

September 27, 2013

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SUMITOMO OSAKA CEMENT CO LTD

H01M4/136; H01M4/36; H01M4/58; H01M4/62; H01M10/052; H01M10/0566

Masatake Shiga
Tadashi Takahashi
Takashi Watanabe
Suzuki Mitsuyoshi
Yasuhiko Murayama

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