Preparation method and application of iron-doped molybdenum disulfide / polymer-based composite solid electrolyte

By combining iron-doped molybdenum disulfide with a polymer matrix, a solid electrolyte with high ionic conductivity and excellent cycle stability was prepared. This solved the problem of high crystallinity of polymer-based solid electrolytes at room temperature, thus improving the safety and performance of the battery.

CN121964871APending Publication Date: 2026-05-01XIANGTAN UNIV
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Patent Information

Application Number
CN202610179927.9
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-02-09
Publication Date
2026-05-01

AI Technical Summary

Technical Problem

Polymer-based solid electrolytes have high crystallinity at room temperature, resulting in poor ion transport performance and easy formation of lithium dendrites on the electrode surface, which affects the cycle performance and safety of the battery.

Method used

Iron-doped molybdenum disulfide nanospheres were prepared by mixing iron-doped molybdenum disulfide with a polymer matrix via a hydrothermal method. This process introduced defects and phase transitions, promoting lithium salt dissociation and the formation of a uniform SEI layer, reducing crystallinity, and improving ion mobility.

Benefits of technology

It improves the ionic conductivity of polymer-based solid electrolytes and the cycle stability of batteries, suppresses the formation of lithium dendrites, and enhances the safety and electrochemical performance of batteries.

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Abstract

The invention discloses a preparation method and application of an iron-doped molybdenum disulfide / polymer-based composite solid-state electrolyte, and relates to the technical field of solid-state batteries. After the iron element is doped, defects are introduced into the structure of the modified molybdenum disulfide, phase change is induced, dissociation of the lithium salt is promoted through synergism of the modified molybdenum disulfide and the iron element, and more free lithium ions are released; and meanwhile, the proportion of an amorphous region of the polymer electrolyte is increased, so that the ionic conductivity is improved, and the oxidation resistance is enhanced. In addition, the iron-doped molybdenum disulfide can effectively catalyze decomposition of lithium salt anions, and construction of a uniform and stable solid electrolyte interface (SEI) layer on the surface of the electrode is facilitated. The all-solid-state lithium metal battery assembled based on the modified solid electrolyte shows excellent electrochemical performance.
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