Preparation method and application of a composite sulfur positive electrode with double-carrier fast conduction

By using a composite sulfur cathode of C/LATP hollow spheres and conductive carbon in solid-state lithium-sulfur batteries, the problems of low conductivity and volume change of the cathode active material are solved, achieving high energy density and excellent cycle stability, reducing the risk of electrolyte degradation, and improving battery safety.

CN117239067BActive Publication Date: 2026-07-21ZHEJIANG UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
ZHEJIANG UNIV
Filing Date
2023-09-19
Publication Date
2026-07-21

AI Technical Summary

Technical Problem

Solid-state lithium-sulfur batteries have low actual energy density and poor cycle stability in their cathodes, mainly due to problems such as low ionic/electronic conductivity of cathode active materials such as sulfur/lithium sulfide, chemical-mechanical failure caused by volume expansion and contraction, electrolyte degradation, and dissolution of lithium polysulfides.

Method used

By using C/LATP hollow spheres as ion/electron composite charge carrier conductors, combined with conductive carbon and polymer solid electrolyte, core-shell structured C/LATP@S nanospheres are prepared to form a composite sulfur cathode, which improves electron/ion conductivity. Furthermore, the dissolution of lithium polysulfides is inhibited through the adsorption and catalytic effect of LATP on polysulfides.

Benefits of technology

It improves the cycle performance and energy density of solid-state lithium-sulfur batteries, reduces costs, enhances safety, suppresses the shuttle effect of lithium polysulfides, and improves the utilization rate and stability of positive electrode active materials.

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Abstract

The application belongs to the technical field of solid-state lithium-sulfur battery positive electrode materials, and discloses a preparation method of a composite sulfur positive electrode with double-carrier rapid conduction and application thereof in a solid-state lithium-sulfur battery. The composite sulfur positive electrode with double-carrier rapid conduction provided by the application has high ion / electron conductivity at room temperature, can significantly improve positive electrode reaction kinetics, and improve the capacity and rate performance of the battery; based on the unique heterogeneous porous structure of the C / LATP shell, the volume expansion effect of sulfur and the shuttle effect of polysulfides can be effectively relieved, which is beneficial to improving the utilization rate of positive electrode active materials and the overall energy density of the battery. The test results of the embodiments show that the solid-state lithium-sulfur battery based on the composite sulfur positive electrode with double-carrier rapid conduction provided by the application has good safety performance and high energy density, can replace traditional lithium-ion batteries, is suitable for electric vehicles, power storage and other purposes, and has a wide application prospect.
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