A cathode active material for nonaqueous electrolyte secondary batteries, a cathode, and a manufacturing method of a nonaqueous electrolyte secondary battery

Japanese Patent JP5907223

B2

PROBLEM TO BE SOLVED: To provide a nonaqueous electrolyte secondary battery improved in capacity and cycle characteristics by use of a negative electrode active material including particles having a structure in which silicon microcrystalline is distributed in silicon dioxide.SOLUTION: A method for manufacturing a negative electrode active material comprises the step of mixing fine powder A and fine powder B so that in a particle size distribution measured by a particle size distribution measurement method by laser diffraction scattering, the cumulative 90%-particle size (D) is 50 μm or less, and the content of the fine powder B having a particle size of less than 2 μm is 1-30 mass%. In the method for manufacturing a negative electrode active material, the fine powder A consists of particles each having a structure in which silicon microcrystalline having a crystal size of 1-500 nm is distributed in silicon, dioxide, silicon oxide or a mixture thereof, and having a particle size of 2 μm or larger; and the fine powder B consists of particles each having a structure in which silicon microcrystalline having a crystal size of 1-500 nm is distributed in silicon dioxide, silicon, silicon oxide or a mixture thereof, and having a particle size of less than 2 μm.

Koichiro Watanabe
Miyawaki Satoru
Shu Kashida
Hirofumi Fukuoka

JP2014181960A

April 26, 2016

September 08, 2014

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Shin-Etsu Chemical Co., Ltd.

H01M4/131; H01M4/134; H01M4/139; H01M4/36; H01M4/48

JP2004047404A
JP2004063433A
JP11031509A
JP2005116389A

Takashi Kojima
Saori Shigematsu
Katsunari Kobayashi
Takeshi Ishikawa
Katsuhiko Masaki

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