Selenium-doped sulfide solid electrolyte and preparation method and application thereof
By introducing selenium elements and metal M cations into the sulfide solid electrolyte, a selenium-doped sulfide solid electrolyte with excellent performance was prepared, which solved the shortcomings of the existing sulfide solid electrolyte in air, solvent and lithium stability, and achieved a high-performance all-solid lithium secondary battery.
CN119725705AActive Publication Date: 2025-03-28NINGBO INST OF MATERIALS TECH & ENG CHINESE ACAD OF SCI
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Patent Information
- Application Number
- CN202510237452.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-03
- Publication Date
- 2025-03-28
- Estimated Expiration
- 2045-03-03
AI Technical Summary
Technical Problem
The existing sulfide solid electrolytes have insufficient air, solvent and lithium stability, resulting in safety hazards and cycle stability problems in their applications.
Method used
The sulfide solid electrolyte doped with selenium is Li6±iP1-xMxS5-ySeyX. By introducing selenium elements and metal M cations, the stability of its air, solvent and lithium is improved, and a sulfide solid electrolyte with excellent performance is prepared by high-temperature calcination treatment.
Benefits of technology
The high ionic conductivity, excellent air, solvent and lithium stability of the sulfide solid electrolyte are achieved, and the all-solid lithium secondary battery produced exhibits excellent cycle stability.
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Abstract
The invention belongs to the technical field of solid electrolytes, and relates to a selenium-doped sulfide solid electrolyte as well as a preparation method and application thereof. The general chemical formula of the sulfide solid electrolyte is Li < 6 + / -iP < 1-x > MxS < 5-y > SeyX, i is greater than or equal to 0 and less than 1, x is greater than 0 and less than 1, y is greater than 0 and less than 1, M is one or more of Zr, Ta, Nb, Mo, Bi, In and Y, and X is one or more of Cl, Br and F. According to the invention, the selenium element with larger ionic radius and lower electronegativity is introduced to replace the sulfur element, and Zr, Ta, Nb, Mo, Bi, In or Y elements are introduced, so that the doped sulfide solid electrolyte system has excellent stability to air, organic solvents and lithium while ensuring high ionic conductivity, and the assembled all-solid-state battery shows excellent cycle stability.
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