SODIUM ION SECONDARY BATTERY

WIPO Patent Application WO/2024/082789

A1

The present application relates to the technical field of electrochemistry, and discloses a sodium ion secondary battery, comprising an electrolyte, a negative electrode, and a positive electrode. The mass percentage a% of a first additive in the electrolyte is 0.1%-3.0%, and the mass percentage b% of a second additive is 1.0%-5.0%; the first additive is sodium tetrafluoro(oxalato)phosphate, and the second additive is a cyclic sulfate additive; the particle size d50 of a negative electrode active material is c, the viscosity of the electrolyte at -20°C is d, and a relationship is satisfied: 5≤5(b-a+d)/c≤23. According to the present application, sodium tetrafluoro(oxalato)phosphate is used as the first additive, so that the viscosity of the electrolyte at the temperature of -20°C or lower is reduced, and a negative electrode material in the particle size range is cooperatively used, such that ions have a better transmission rate; because sodium tetrafluoro(oxalato)phosphate is insufficient in stability when participating in film formation, the cyclic sulfate additive is used in cooperation and can be better than other components of the electrolyte to participate in film formation, so that a low-impedance and stable SEI film is formed, and the objectives of improving the low-temperature discharge performance of a sodium ion battery and improving the cycle performance are achieved.

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LIU ZHONGBO (CN)
LIU YANG (CN)
AO XIAOHU (CN)
ZHANG QIANGQIANG (CN)
ZHENG ZHONGTIAN (CN)

PCT/CN2023/112472

April 25, 2024

August 11, 2023

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SHENZHEN CAPCHEM TECHNOLOGY CO LTD (CN)

H01M10/054; H01M10/0567

CN114497744A	2022-05-13
CN113991177A	2022-01-28
CN113809398A	2021-12-17
JP2017117684A	2017-06-29
CN108155408A	2018-06-12

SHENZHEN GHZF INTELLECTUAL PROPERTY AGENCY (GENERAL PARTNERSHIP) (CN)

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