- 专利标题: NEGATIVE ELECTRODE FOR NONAQUEOUS ELECTROLYTE SECONDARY BATTERIES, AND NONAQUEOUS ELECTROLYTE SECONDARY BATTERY USING SAME
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申请号: EP19870919.8申请日: 2019-10-02
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公开(公告)号: EP3866223A1公开(公告)日: 2021-08-18
- 发明人: NAKANO, Takeshi , ITO, Atsushi , OGIHARA, Wataru , NAKASHIMA, Yusuke , MINAMI, Kazuya , SHOJI, Naofumi , SUZUKI, Kaho
- 申请人: NISSAN MOTOR CO., LTD.
- 申请人地址: JP Yokohama-shi, Kanagawa 221-0023 2 Takara-cho Kanagawa-ku
- 代理机构: Grünecker Patent- und Rechtsanwälte PartG mbB
- 优先权: JP2018193618 20181012
- 国际公布: WO2020075597 20200416
- 主分类号: H01M4/13
- IPC分类号: H01M4/13 ; H01M4/133 ; H01M4/36 ; H01M4/48 ; H01M4/587 ; H01M4/62
摘要:
Provided is a technique capable of further improving the cycle characteristics in a negative electrode for a non-aqueous electrolyte secondary battery in which a silicon-based negative electrode active material and a carbon-based negative electrode active material are used in combination as a negative electrode active material, and constituent components of the electrode are not bound to each other via a binder. The negative electrode for a non-aqueous electrolyte secondary battery according to the present invention has a configuration in which a negative electrode active material layer containing a negative electrode active material is formed on a surface of a current collector. The negative electrode active material contains composite secondary particles in which silicon-based negative electrode active material particles and carbon-based negative electrode active material particles are bound to each other via a binder. Here, the content of the binder in the composite secondary particles is 1% by mass or more with respect to the total mass of the silicon-based negative electrode active material particles and the carbon-based negative electrode active material particles. Further, in the negative electrode active material layer, the composite secondary particles are characterized to exist in a state of being not bound to each other via a binder.
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