NEGATIVE ELECTRODE ACTIVE MATERIAL, MIXED NEGATIVE ELECTRODE ACTIVE MATERIAL, NEGATIVE ELECTRODE FOR NON-AQUEOUS ELECTROLYTE SECONDARY BATTERIES, LITHIUM ION SECONDARY BATTERY, METHOD FOR PRODUCING NEGATIVE ELECTRODE ACTIVE MATERIAL, AND METHOD FOR PRODUCING LITHIUM ION SECONDARY BATTERIES

WIPO Patent Application WO/2017/119031

A1

The present invention provides a negative electrode active material which includes negative electrode active material particles, and which is characterized in that: the negative electrode active material particles include silicon compound particles including a silicon compound (SiOx:0.5≤x≤1.6); the silicon compound particles include Li2SiO3 and/or Li4SiO4; the negative electrode active material includes not more than 2 mass% of silicon dioxide particles, and includes silicon dioxide-carbon composite secondary particles including a plurality of the silicon dioxide particles and carbon; and the composite secondary particles include a lithium compound in at least some of the sites other than those of the silicon dioxide and the silicon compound (SiO­x:0.5≤x≤1.6) in the composite secondary particles. Accordingly, provided is a negative electrode active material which, when used as a negative electrode active material of a lithium ion secondary battery, is capable of improving cycle characteristics and initial charge/discharge characteristics.

MATSUNO TAKUMI (JP)
HIROSE TAKAKAZU (JP)
KAMO HIROMICHI (JP)
FURUYA MASAHIRO (JP)
AWANO HIDEKAZU (JP)

PCT/JP2016/005148

July 13, 2017

December 16, 2016

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SHINETSU CHEMICAL CO (JP)

H01M4/48; C01B33/113; H01M4/13; H01M4/133; H01M4/36; H01M4/58; H01M4/66

WO2015198511A1

2015-12-30

JP2004063433A

2004-02-26

YOSHIMIYA, Mikio et al. (JP)

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