A titanium oxide cluster electrolyte additive, its preparation method and application

Modified titanium oxide cluster electrolyte additives, formed by the exchange reaction of titanium oxide clusters and polycaprolactone derivatives, form a TiO2 protective layer in situ on the positive and negative electrode surfaces of lithium-ion batteries. This solves the problem of surface activity regulation of positive and negative electrode materials under high voltage conditions in lithium-ion batteries, and improves the stability and safety of the batteries.

CN119481278BActive Publication Date: 2026-03-13HUAZHONG UNIV OF SCI & TECH
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2024-11-11
Publication Date
2026-03-13

AI Technical Summary

Technical Problem

Under high voltage conditions, the surface activity of positive and negative electrode materials in existing lithium-ion batteries is difficult to control, leading to frequent side reactions, uncontrolled lithium dendrite growth, and poor battery performance and safety. Existing inert protective layer methods are difficult to apply to lithium metal negative electrodes and are prone to damaging the positive electrode structure.

Method used

A modified titanium oxide cluster electrolyte additive is formed by exchanging titanium oxide clusters with polycaprolactone derivatives in an organic solvent. This additive forms an inert TiO2 protective layer on the positive and negative electrode surfaces in situ. The electrolyte additive decomposes during battery cycling, ensuring that the protective layer adheres tightly to the electrode surface.

Benefits of technology

It effectively suppresses side reactions of the positive and negative electrodes, improves the electrochemical stability and ion transport of lithium metal batteries, inhibits lithium dendrite growth, enhances battery safety and performance, and the protective layer does not damage the electrode material structure.

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Abstract

This invention belongs to the field of electrochemical energy storage materials technology, specifically a titanium-oxygen cluster electrolyte additive, its preparation method, and its application. Titanium-oxygen clusters and polycaprolactone derivatives are placed together in an organic solvent and subjected to an exchange reaction to obtain a modified titanium-oxygen cluster solution. After evaporating the solvent, the titanium-oxygen cluster electrolyte additive is obtained. The preparation method of this invention is simple to operate and easy to promote. The titanium-oxygen cluster electrolyte additive only needs to be mixed into the electrolyte to form a TiO2-rich inert interface protective layer on the electrode surface during battery cycling through in-situ oxidative decomposition. The titanium-oxygen cluster electrolyte additive can act simultaneously on the positive and negative electrode interfaces. The formed TiO2 interface protective layer can inhibit surface reactivity, prevent surface reconstruction and impedance accumulation, protect the positive electrode material structure from damage, and inhibit the uneven growth of lithium dendrites in the negative electrode, effectively improving the cycle stability and safety of lithium metal batteries under high voltage.
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Citation Information

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