Electrolyte additive and nonaqueous electrolyte and secondary battery

By constructing a composite interface film at the electrode interface using multi-component additives, the problems of interface stability and battery performance degradation in existing electrolyte systems with different cathode materials are solved, and interface impedance suppression and battery performance improvement are achieved under low-temperature conditions.

CN121983670BActive Publication Date: 2026-06-19TAIKO UNION NEW MATERIAL TECHNOLOGY LTD
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Patent Information

Application Number
CN202610442323.9
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2026-04-07
Publication Date
2026-06-19
Estimated Expiration
2046-04-07

AI Technical Summary

Technical Problem

Existing electrolyte systems struggle to balance interfacial mechanical stability, electronic insulation, ion conductivity, and oxidation or reduction resistance in different cathode material systems, leading to increased interfacial impedance and decreased battery performance.

Method used

A multi-component additive system is used to construct a composite interfacial membrane with a sequential and spatial partitioned structure at the electrode interface. This includes lithium salts containing fluorosulfonyl groups, compounds containing sulfonyl structures, and compounds containing sulfate ester ring structural units, forming an interfacial membrane with an inorganic enrichment inner layer, a sulfonyl regulation layer, and an organic-inorganic composite buffer layer.

Benefits of technology

Suppressing interface impedance growth in low-temperature environments improves low-temperature rate charging performance, enhances interface stability and kinetic performance, and achieves safety and high-voltage cycle stability.

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Abstract

This invention discloses an electrolyte additive, a non-aqueous electrolyte thereof, and a secondary battery. The electrolyte additive comprises a first additive, a second additive, and a third additive. The first additive is a lithium salt containing a fluorosulfonyl group; the second additive is a compound containing a sulfonyl group; and the third additive is a compound containing two or more sulfate ester ring structural units. Through the synergistic effect of the above-mentioned multi-component additives, an interfacial film with differentiated characteristics can be constructed in situ at the electrode interface, thereby helping to improve high-voltage cycling stability, reduce interfacial side reactions, optimize low-temperature kinetics, and improve rate performance. This invention further discloses a non-aqueous electrolyte containing the electrolyte additive and a secondary battery using the non-aqueous electrolyte.
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Citation Information

Patent Citations

  • Non-aqueous electrolyte for secondary battery and secondary battery thereof

    CN120933465A