Electrolyte and lithium ion battery

By using electrolyte containing thiophenesulfonamide additives in lithium-ion batteries, the problem of unstable operation of lithium-ion batteries in a wide temperature range is solved, and the battery's high-temperature storage and low-temperature discharge performance is improved.

CN119725737APending Publication Date: 2025-03-28SHANGHAI XUANYI NEW ENERGY DEV CO LTD
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Patent Information

Application Number
CN202411822407.2
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-12-11
Publication Date
2025-03-28

AI Technical Summary

Technical Problem

Lithium-ion batteries are difficult to operate stably in a wide temperature range, and the existing electrochemical systems cannot meet the comprehensive requirements of high and low temperature performance.

Method used

An electrolyte is provided, which contains 10% to 15% lithium salt, 0.1% to 3.0% thiophenesulfonamide additive and a residual amount of organic solvent. The thiophenesulfonamide additive is decomposed during charging and discharging to form an interface component rich in inorganic Li3N and Li-S compounds, thereby improving the stability of the interface of the electrode material.

Benefits of technology

Improve the low-temperature performance of lithium-ion batteries, improve high-temperature storage and cycle stability, and ensure the good operation of the battery in a wide temperature range.

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Abstract

The invention provides an electrolyte and a lithium ion battery. The electrolyte comprises the following components in percentage by mass: 10-15% of lithium salt; 0.1%-3.0% of a thiophene sulfonamide additive and the balance of an organic solvent; the structural formula of the thiophene sulfonamide additive is # imgabs0 #, R1 and R2 are respectively and independently selected from any one of H, halogen and substituted or unsubstituted C1-C10 alkyl, and at least one of R1 and R2 is substituted or unsubstituted C1-C10 alkyl. Thiophene and sulfonamide functional groups in the thiophene sulfonamide additive can be decomposed to form interface components rich in inorganic Li3N and Li-S compounds in the charging and discharging process, a solid interface film with higher protectiveness is formed, and the stability of an electrode material interface and a bulk phase structure is improved.
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