Lithium supplement additive and preparation method thereof, electrolyte, electrode plate and lithium ion battery

By using lithium sulfinate compounds as lithium supplement additives in lithium-ion batteries, and using electron-absorbing groups to change the electron cloud distribution, the problem of side reactions with the electrolyte after delivery of the existing lithium supplement materials is solved, the capacity and safety of the battery are improved, and the stability of the electrode active material is enhanced.

CN120383545APending Publication Date: 2025-07-29SHENZHEN DYNANONIC INNOVAZONE NEW ENERGY TECH CO LTD
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Patent Information

Application Number
CN202510378715.9
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-03-27
Publication Date
2025-07-29

AI Technical Summary

Technical Problem

The remaining substances after deliquification in lithium-ion batteries occur side-reacting with the electrolyte after deliquification in lithium-ion batteries, resulting in battery capacity loss and safety issues, making it difficult to meet the needs of high-performance batteries.

Method used

Lithium sulfinate compound is used as lithium supplement additives. By introducing electron-absorbing groups into the molecular structure, the electron cloud distribution is changed, the capacity of lithium-ion batteries and the first-time Coulomb efficiency are improved, and a protective film layer is formed in the electrode sheet to avoid adverse reactions between the product and the electrolyte after deliquification.

Benefits of technology

It improves the capacity and safety of lithium-ion batteries, enhances the stability of electrode active materials, improves the circulation performance and safety of the batteries, and avoids the occurrence of side reactions.

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Abstract

The invention discloses a lithium supplement additive and a preparation method and application thereof. The lithium supplement additive comprises a lithium sulfinate compound, and the lithium sulfinate compound contains an electron withdrawing group. An electron withdrawing group contained in the lithium sulfinate compound in the lithium supplement additive can effectively change electron cloud distribution around sulfur atoms, so that the lithium sulfinate compound is endowed with relatively high lithium supplement capacity; meanwhile, due to the existence of the electron withdrawing group, the electron energy of the lowest unoccupied molecular orbital (LUMO) of the lithium sulfinate compound is reduced, and the energy gap between the highest occupied molecular orbital (HOMO) and the LUMO of the lithium sulfinate compound is reduced, so that the lithium supplement additive can be arranged in an electrode plate to exert the lithium supplement capacity and also can be used as an electrolyte additive; and the material can participate in electrode / electrolyte interface formation.
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