- Patent Title: Negative electrode active material for nonaqueous electrolyte secondary battery, negative electrode for nonaqueous electrolyte secondary battery, nonaqueous electrolyte secondary battery, and production method of negative electrode active material for nonaqueous electrolyte secondary battery
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Application No.: US16063016Application Date: 2016-12-16
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Publication No.: US10559812B2Publication Date: 2020-02-11
- Inventor: Takumi Matsuno , Takakazu Hirose , Kohta Takahashi , Masahiro Furuya
- Applicant: SHIN-ETSU CHEMICAL CO., LTD.
- Applicant Address: JP Tokyo
- Assignee: SHIN-ETSU CHEMICAL CO., LTD.
- Current Assignee: SHIN-ETSU CHEMICAL CO., LTD.
- Current Assignee Address: JP Tokyo
- Agency: Oliff PLC
- Priority: JP2016-000287 20160104
- International Application: PCT/JP2016/005149 WO 20161216
- International Announcement: WO2017/119032 WO 20170713
- Main IPC: H01M4/133
- IPC: H01M4/133 ; H01M4/485 ; H01M4/36 ; H01M4/38 ; H01M4/48 ; H01M10/052 ; C01B33/113 ; H01M10/0525 ; H01M4/134

Abstract:
A negative electrode active material for nonaqueous electrolyte secondary batteries including: a particle of negative electrode active material, wherein the particle of negative electrode active material contains a particle of silicon compound containing a silicon compound (SiOx:0.5≤x≤1.6), on at least a part of a surface of the silicon compound a carbon coating film being formed, and the negative electrode active material contains 2% by mass or less of particle of silicon dioxide and the negative electrode active material contains a silicon dioxide-carbon composite secondary particle containing a plurality of the particles of silicon dioxide and carbon. As a result, the negative electrode active material for nonaqueous electrolyte secondary batteries capable of increasing battery capacity and improving the cycle characteristics and battery initial efficiency is provided.
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