Invention Grant
- Patent Title: Negative electrode sheet and secondary battery
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Application No.: US16973903Application Date: 2019-10-14
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Publication No.: US11114659B2Publication Date: 2021-09-07
- Inventor: Meng Kang , Yuliang Shen , Jiazheng Wang , Libing He
- Applicant: Contemporary Amperex Technology Co., Limited
- Applicant Address: CN Fujian
- Assignee: Contemporary Amperex Technology Co., Limited
- Current Assignee: Contemporary Amperex Technology Co., Limited
- Current Assignee Address: CN Fujian
- Agency: Maier & Maier, PLLC
- Priority: CN201811209262.3 20181017
- International Application: PCT/CN2019/110992 WO 20191014
- International Announcement: WO2020/078307 WO 20200423
- Main IPC: H01M4/36
- IPC: H01M4/36 ; H01M4/505 ; H01M4/525 ; H01M4/134 ; H01M4/133 ; H01M10/0525 ; H01M4/02

Abstract:
The present application provides a negative electrode sheet and a secondary battery. The negative electrode sheet includes a negative current collector and a negative electrode film provided on at least one surface of the negative current collector and comprising a negative active substance. The negative electrode sheet also satisfies: 0.3≤a×(1.1/b+0.02×c)≤6.0, where a represents the specific surface area of the negative electrode film, and the unit is m2/g; b represents the compaction density of the negative electrode film, and the unit is g/cm3; c represents the cohesive force between the negative electrode film and the negative current collector, and the unit is N/m. The present application can make the negative electrode sheet have excellent dynamics performance, and meanwhile ensure that the secondary battery has good dynamics performance and cycle performance without sacrificing energy density.
Public/Granted literature
- US20210249650A1 NEGATIVE ELECTRODE SHEET AND SECONDARY BATTERY Public/Granted day:2021-08-12
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