Title:
LITHIUM ION SECONDARY BATTERY
Document Type and Number:
WIPO Patent Application WO/2023/100498
Kind Code:
A1
Abstract:
The present invention provides a lithium ion secondary battery which has a high capacity and is suppressed in breakage and elongation of the negative electrode due to repeated charging and discharging. A lithium ion secondary battery as an example of the embodiment of the present invention is provided with a positive electrode, a negative electrode, a separator which separates the positive electrode and the negative electrode from each other, and an electrolyte. The negative electrode comprises a negative electrode collector and a negative electrode mixture layer that is formed on the surface of the negative electrode collector; the thickness of the negative electrode collector is 4 µm to 12 µm; the 1% proof stress of the negative electrode collector is 300 MPa to 700 MPa; the negative electrode mixture layer contains a carbon-based material and a silicon-based material, which serve as negative electrode active materials; the discharge capacity of the negative electrode active materials is 400 mAh/g to 750 mAh/g; the carbon-based material contains a carbon-based material A and a carbon-based material B, which have different particle fracture strengths from each other; the particle fracture strength of the carbon-based material A is 5 MPa to 15 MPa; and the particle fracture strength of the carbon-based material B is 25 MPa to 40 MPa.
Inventors:
TANI YUJI
SATO YOSUKE
SATO YOSUKE
Application Number:
PCT/JP2022/038361
Publication Date:
June 08, 2023
Filing Date:
October 14, 2022
Export Citation:
Assignee:
PANASONIC IP MAN CO LTD (JP)
International Classes:
H01M4/13; H01M4/36; H01M4/38; H01M4/587; H01M4/66
Domestic Patent References:
| WO2020162504A1 | 2020-08-13 | |||
| WO2013047432A1 | 2013-04-04 | |||
| WO2022176650A1 | 2022-08-25 |
Foreign References:
| JP2021128845A | 2021-09-02 | |||
| JP2013069684A | 2013-04-18 |
Attorney, Agent or Firm:
YKI INTELLECTUAL PROPERTY ATTORNEYS (JP)
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