LiAlO2 fast ion conductor coated silicon-carbon composite material as well as preparation method and application thereof

By coating the surface of the silicon-carbon composite material with a LiAlO2 fast ion conductor layer and constructing a three-dimensional network structure, the problem of structural destruction of the silicon-carbon negative electrode material caused by volume change in lithium-ion batteries is solved, the battery's cycle performance and rate performance are improved, and a lithium-ion battery with high stability and high conductivity is achieved.

CN120749142APending Publication Date: 2025-10-03HUNAN KINGI TECH CO LTD
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Patent Information

Application Number
CN202510889552.0
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-06-30
Publication Date
2025-10-03

AI Technical Summary

Technical Problem

The existing silicon-carbon negative electrode materials in lithium-ion batteries suffer structural damage due to the volume change of silicon, resulting in electrode pulverization and poor electrical contact, affecting battery capacity and cycle stability. In addition, the existing coating materials have weak bonding strength and poor ionic conductivity, which affects battery performance.

Method used

LiAlO2 fast ion conductor is used to coat silicon-carbon composite material. By constructing a three-dimensional network structure and coating the LiAlO2 fast ion conductor layer on its surface, a dense and uniform LiAlO2 fast ion conductor layer is formed by liquid phase coating to enhance the bonding force and ionic conductivity.

Benefits of technology

It significantly improves the cycle performance and rate performance of lithium-ion batteries, extends battery life, enhances the structural stability and electrical conductivity of the battery, and achieves high stability and high rate performance.

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Abstract

The invention discloses a LiAlO2 fast ion conductor coated silicon-carbon composite material as well as a preparation method and application thereof, and belongs to the technical field of lithium ion battery materials. The LiAlO2 fast ion conductor coated silicon carbon composite material has a core-shell structure; an inner core of the composite material is a silicon-carbon composite material, the silicon-carbon composite material is formed by coating a three-dimensional carbon material with an amorphous carbon layer and loading a nano silicon compound, a shell of the composite material is a LiAlO2 fast ion conductor layer, and the silicon-carbon composite material with a three-dimensional network structure is constructed, and the surface of the silicon-carbon composite material is coated with the LiAlO2 fast ion conductor layer, so that the composite material is obtained. According to the present invention, with the LiAlO2, the volume expansion of the nanometer silicon during the charge-discharge process can be effectively relieved, the stability of the silicon-carbon composite material structure can be improved so as to significantly improve the cycle performance of the battery, and the LiAlO2 can provide the rapid channel for the transmission of the lithium ion during the charge-discharge process so as to improve the rate performance of the battery;
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