Negative electrode material and preparation method and application thereof

By using a core-shell structure negative electrode material coated with titanium dioxide with copper oxide, the problems of low rate performance and poor conductivity in high-capacity lithium-ion batteries are solved, and the performance of lithium-ion batteries with high conductivity and high energy density are achieved.

CN119650645APending Publication Date: 2025-03-18JIANGSU ZENIO NEW ENERGY BATTERY TECH CO LTD
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Patent Information

Application Number
CN202411823103.8
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-12-10
Publication Date
2025-03-18

AI Technical Summary

Technical Problem

Traditional graphite anode materials have low magnification performance and low lithium embedded potential in high-capacity lithium-ion batteries, making it difficult to meet the needs of high energy density. The theoretical specific capacity of titanium dioxide anode materials is low and have poor ion and electron conductivity, which limits their application.

Method used

The core-shell structure negative electrode material of copper oxide coated with titanium dioxide is used to synthesize a composite material of titanium dioxide core and cuprous oxide coating layer to improve the conductivity and cyclic properties of the material.

Benefits of technology

It achieves high conductivity, high rate performance and good cycle performance, and improves the overall performance of lithium-ion batteries, especially energy density and cycle stability.

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Abstract

The invention provides a negative electrode material and a preparation method and application thereof. The negative electrode material has a core-shell structure and comprises a titanium dioxide inner core and a coating layer compounded on the surface of the titanium dioxide inner core, the coating layer is composed of cuprous oxide particles; the preparation method of the negative electrode material comprises the following steps: a) mixing titanium dioxide, CuCl2. 2H2O, alkali, water and a reducing agent, and reacting to obtain a reaction mixture; and b) sequentially cooling, centrifugally separating and drying the reaction mixture obtained in the step a) to obtain the negative electrode material. Compared with the prior art, the negative electrode material provided by the invention adopts a core-shell structure that titanium dioxide is coated with cuprous oxide, so that relatively good overall interaction is realized, a coating-foil interface can be improved, and an interface effect of an electronic highway network is formed, so that the conductivity, the rate capability and the cycle performance of the material are improved.
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