Non-aqueous electrolyte and sodium ion battery containing same

By using Compounds A and B in sodium ion batteries to form a uniform and dense SEI film, the problem of SEI film instability is solved, and the high-temperature storage and low-temperature cycling performance of the battery is improved.

CN120376752APending Publication Date: 2025-07-25ZHUHAI SMOOTHWAY ELECTRONICS MATERIALS
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Patent Information

Application Number
CN202510547132.4
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-04-28
Publication Date
2025-07-25

AI Technical Summary

Technical Problem

The SEI film of sodium ion batteries is uneven, has poor density and insufficient thermodynamic stability, resulting in poor high-temperature storage and low-temperature circulation performance.

Method used

Compounds A and B in the nonaqueous electrolyte are used as additives to form a uniform, dense, thermodynamically stable SEI film, which is rich in high content of inorganic sodium salt, and improves the protection effect of the negative electrode surface.

Benefits of technology

Significantly improve the high-temperature storage performance and high-low temperature circulation performance of sodium ion batteries, improve the stability of electrode materials and the consumption of active ingredients of the electrolyte.

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Abstract

The invention discloses a non-aqueous electrolyte and a sodium ion battery containing the non-aqueous electrolyte, the non-aqueous electrolyte comprises a non-aqueous organic solvent, a sodium salt and an additive, the additive comprises a compound A and a compound B, the compound A comprises at least one of compounds as shown in a formula 1 and a formula 2, and the structure of the compound B is as shown in a formula 3; in the formula, R1 to R2 are respectively and independently selected from hydrogen, cyano groups or alkyl groups of C1 to C10, and R3 is selected from alkyl groups of C1 to C10. The non-aqueous electrolyte adopts the compound A and the compound B as additives, the compound A and the compound B can form a uniform, compact and thermodynamically stable SEI film on the surface of a negative electrode through a synergistic effect, and meanwhile, the SEI film is also rich in high-content inorganic sodium salts (NaF, Na3N, Na2S, N-SOx and the like), so that the dissolution of the SEI film in high-temperature storage and circulation processes can be effectively relieved, and the service life of the non-aqueous electrolyte is prolonged. Therefore, the low-temperature cycle performance and the high-temperature storage performance are improved.
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