Inorganic sulfide solid electrolyte and preparation method thereof
By introducing doped elements and mixed halogen into the inorganic sulfide solid electrolyte, the problem of instability of the electrolyte under air conditions is solved, and the high ion conductivity and air stability is achieved, which is suitable for the application of all-solid lithium batteries.
CN117199507BActive Publication Date: 2025-03-28GUOLIAN CORE MATERIALS (BEIJING) TECHNOLOGY CO LTD
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Patent Information
- Application Number
- CN202311024698.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2023-08-14
- Publication Date
- 2025-03-28
- Estimated Expiration
- 2043-08-14
AI Technical Summary
Technical Problem
The existing inorganic sulfide solid electrolytes are unstable under air conditions, resulting in structural changes and reduced ion conductivity, limiting their application in all-solid lithium batteries.
Method used
By performing double-position substitution in the sulfide electrolyte, doping elements such as Sn, Si, Al, Ge, Zr, etc., and using mixed halogen and proportional design, the air stability and ion conductance of the electrolyte are improved.
Benefits of technology
It realizes that the air stability of the electrolyte is improved while maintaining high ion conductance, meets the use requirements of all-solid-state batteries, and reduces production costs.
✦ Generated by Eureka AI based on patent content.
Abstract
The present invention relates to the technical field of lithium-ion batteries, and in particular to an inorganic sulfide solid electrolyte and a preparation method thereof, wherein the general formula thereof is shown as follows: Li 7+a‑c P 1‑a M a S 6‑b‑c O b X c (I); wherein M is one or more of Sn, Si, Al, Ge, and Zr; 0 <a≤0.3,0<b<2.0,0.0≤c≤1.8;X c Cl i Br j I k , and 0≤i≤1.0, 0≤j≤1.0, 0≤k≤1.0, and at least two of i, j, k are not 0, i+j+k=c. The inorganic sulfide solid electrolyte of the present invention adopts M to replace part or all of the P element in the sulfide electrolyte, O to replace part of the S element, and controls the ratio between M and O and the type and ratio of the mixed halogen to form an inorganic sulfide solid electrolyte with a solid solution phase structure, high stability and high ion conductivity.
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