A negative electrode material for a lithium battery with high temperature and high rate and a preparation method thereof

By generating polyurea polymer with a three-dimensional network space structure and carbonizing at high temperature, a lithium battery negative electrode material for high temperature and high magnification was prepared, which solved the problem of insufficient specific capacity and rate performance of existing materials, and achieved higher specific capacity and Coulomb efficiency.

CN119569032BActive Publication Date: 2025-08-29JIANGSU LIANGNENG POWER TECH CO LTD +1
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Patent Information

Application Number
CN202411782098.0
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2024-12-05
Publication Date
2025-08-29
Estimated Expiration
2044-12-05

AI Technical Summary

Technical Problem

The specific capacity and rate performance of the negative electrode materials of existing lithium-ion batteries are insufficient, which limits the practical application of lithium-ion batteries.

Method used

The polymerization reaction is carried out by di(3,6-diaminocarbazole)dimethylsilane containing four amino groups and toluene-2,4-diisocyanate, etc. to form a polyurea polymer with a three-dimensional network space structure, and carbonized at high temperature to form a carbon-based negative electrode material with a large number of pore structures.

Benefits of technology

The specific surface area and conductivity of the negative electrode material of lithium battery are improved, and more lithium ion migration and transmission channels and lithium storage sites are provided, which show higher specific capacity, Coulomb efficiency and rate performance, especially at high temperatures, which still maintain good electrochemical performance.

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Abstract

The present invention relates to the technical field of lithium-ion batteries, and discloses a high-temperature, high-rate lithium battery negative electrode material and a preparation method thereof. The present invention reacts di(3,6-diaminocarbazole)dimethylsilane and diisocyanate to obtain a silicon-containing polyurea polymer, which is then blended with potassium hydroxide and carbonized to obtain a porous carbon-based high-temperature, high-rate lithium battery negative electrode material. The porous carbon-based negative electrode material of the present invention contains active nitrogen-doped structures such as pyrrole nitrogen and graphite nitrogen, which is beneficial to improving the electrochemical properties such as the electrical conductivity and specific capacity of the carbon-based negative electrode material. At the same time, during the high-temperature carbonization process, silicon element forms active ingredients such as nano-silicon and silicon carbide, which are evenly dispersed in the carbon matrix, further improving the electrochemical properties such as specific capacity, so that the negative electrode material exhibits higher charge and discharge specific capacity, coulombic efficiency and rate performance.
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Citation Information

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