A modified inorganic nanoparticle colloid electrolyte for inhibiting corrosion of aluminum foil, a preparation method thereof, and a battery

By modifying inorganic nanoparticles to form a protective film in the electrolyte, the corrosion problem of lithium salt on aluminum foil was solved, and the cycle stability and capacity retention of the battery were improved.

CN121076241BActive Publication Date: 2026-06-02SICHUAN SAIKE POWER TECHNOLOGY CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
SICHUAN SAIKE POWER TECHNOLOGY CO LTD
Filing Date
2025-10-29
Publication Date
2026-06-02

AI Technical Summary

Technical Problem

Conventional lithium salts LiFSI and LiTFSI have a severe corrosive effect on the positive electrode aluminum foil, leading to the breakage of the battery aluminum tabs and limiting their application in high-rate and high-safety electrolytes.

Method used

Modified inorganic nanoparticles (such as Al2O3) are grafted with long-chain silane coupling agents to form carbonate-based electrolytes. When added to the electrolyte, the nano-confinence and steric hindrance effect of the long-chain groups are utilized to suppress the contact reaction between lithium salt and aluminum foil, forming a protective film and reducing corrosion.

Benefits of technology

It effectively inhibits aluminum foil corrosion, improves battery cycle stability, avoids corrosion and breakage of the positive electrode aluminum tab, and improves battery capacity retention.

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Abstract

The application discloses a modified inorganic nanoparticle colloid electrolyte for inhibiting corrosion of aluminum foil, which comprises a carbonate-based electrolyte and modified inorganic nanoparticles, wherein the modified inorganic nanoparticles are obtained by grafting modification of inorganic nanoparticles by a long-chain silane coupling agent; and the modified inorganic nanoparticles account for 1-5% of the mass of the carbonate-based electrolyte. By grafting long-chain alkyl functional groups on the surface of the inorganic nanoparticles, the application improves the interaction and steric effect of the inorganic nanoparticles with the solvent and lithium salt, and finally forms a colloid electrolyte. Through the colloid electrolyte, the cycle stability of the battery cell can be improved, and the fracture and sudden capacity drop of the battery caused by the corrosion of the positive aluminum tab can be avoided.
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