- Patent Title: Secondary battery and method for manufacturing secondary battery
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Application No.: US16662243Application Date: 2019-10-24
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Publication No.: US11271208B2Publication Date: 2022-03-08
- Inventor: Takahiro Tamura , Shinichi Yamami , Fumiya Kanetake , Kentaro Takahashi
- Applicant: SANYO Electric Co., Ltd.
- Applicant Address: JP Daito
- Assignee: SANYO Electric Co., Ltd.
- Current Assignee: SANYO Electric Co., Ltd.
- Current Assignee Address: JP Daito
- Agency: Westerman, Hattori, Daniels & Adrian, LLP
- Priority: JPJP2018-204297 20181030
- Main IPC: H01M4/62
- IPC: H01M4/62 ; H01M4/133 ; H01M4/02 ; H01M4/1393 ; H01M4/04 ; H01M4/587 ; H01M10/0525

Abstract:
A secondary battery according to one aspect of the present disclosure includes a negative electrode which includes a negative electrode core and a negative electrode active material layer provided on at least one surface of the negative electrode core. In this secondary battery, the negative electrode active material layer includes a negative electrode active material which contains graphite having a crystalline size of 10 nm or more and an interlayer distance d002 of 0.3356 to 0.3360 nm and a rubber-based binding material having an average primary particle diameter of 120 to 250 nm, the negative electrode active material has a pore capacity of 0.5 ml/g or less at a pore diameter of 0.2 to 1 μm measured by a mercury porosimeter, and the rate of the average primary particle diameter of the rubber-based binding material to the pore capacity of the negative electrode active material is 1.15 to 1.70 g/m2.
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