A method and application for synergistic modification of sulfide electrolytes by doping and coating

By introducing specific elements for doping and coating modification into the sulfide electrolyte, the problems of low ionic conductivity and poor interface stability of the sulfide electrolyte in all-solid-state lithium metal batteries are solved, achieving high-rate charge and discharge and interface stability, which is suitable for industrial production.

CN115954536BActive Publication Date: 2026-06-30Yueqing Yandangshan Electrical Research Institute
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Yueqing Yandangshan Electrical Research Institute
Filing Date
2023-02-07
Publication Date
2026-06-30

AI Technical Summary

Technical Problem

Existing sulfide electrolytes in all-solid-state lithium metal batteries suffer from low ionic conductivity, narrow voltage window, and poor compatibility with lithium metal anodes and oxide cathodes, which limits their application in high-rate charge/discharge and interface stability.

Method used

A synergistic modification method of doping and coating is adopted, which involves introducing specific non-metallic elements into the sulfide electrolyte and coating it with low-melting-point metal chlorides to form a sulfide electrolyte with synergistic modification of bulk doping and surface coating. The specific steps include high-temperature sintering and low-temperature ball milling.

Benefits of technology

It increases the critical current density of the electrolyte, improves the interfacial stability between the positive and negative electrodes, enhances the overall electrochemical performance of the all-solid-state battery, and is suitable for industrial production.

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Abstract

This invention discloses a method and application for synergistic modification of sulfide electrolytes through doping and coating. The technical solution includes: step (1), mixing LiCl, P2S5, Li2S, and LiX according to Li 6‑a PS 5‑ a Cl 1+a‑b X b After weighing according to stoichiometry, ball milling is performed, where 0 < a < 0.8, 0 < b < 0.5, and X is one or more of F (fluorine), Br (bromine), and I (iodine); Step (2): After pressing the raw material obtained in step (1) into tablets, it is sealed in a sintering container and subjected to a first-stage high-temperature sintering at 450~600℃ for 1~15 h to form an F, Br, or I doped modified sulfide electrolyte; Step (3): After adding 0~20% by mass of one or more of AlCl3, NbCl5, and BiCl3 to the electrolyte obtained after sintering in step (2), ball milling is performed; Step (4): After pressing the raw material obtained in step (3) into tablets, it is sealed in a sintering container and subjected to a second-stage low-temperature sintering at 200~450℃ for 1~8 h, utilizing the low melting point characteristics of the surface coating compounds AlCl3, NbCl5, and BiCl3, to achieve Li 6‑a PS 5‑a Cl 1+a Synergistic modification of electrolyte bulk phase doping and surface coating.
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