Sulfide-based solid electrolyte, sulfide-based solid electrolyte preparation method, and all-solid-state battery comprising sulfide-based solid electrolyte
A sulfide-based solid electrolyte with a thio-lisicon region II type crystal phase and halogen elements enhances lithium ion conductivity and stability, addressing stability issues with lithium metal anodes in all-solid-state batteries.
WO2026142375A1PCT designated stage Publication Date: 2026-07-02LG ENERGY SOLUTION LTD
Patent Information
- Authority / Receiving Office
- WO · WO
- Patent Type
- Applications
- Current Assignee / Owner
- LG ENERGY SOLUTION LTD
- Filing Date
- 2025-12-26
- Publication Date
- 2026-07-02
AI Technical Summary
Technical Problem
Li10GeP2S12 sulfide-based solid electrolytes have low stability with lithium metal anodes and require improvements in lithium ion conductivity for effective use in all-solid-state batteries.
Method used
A sulfide-based solid electrolyte with a thio-lisicon region II type crystal phase, represented by the chemical formula (100-z)[{0.75+y/75+6.25x/75}Li2S-{0.25-12.5(x/2)/75}P2S5-{12.5x/75}SiS2]-zLiHa, where 0
Benefits of technology
The electrolyte achieves high lithium ion conductivity of 4.8 mS/cm or higher, providing improved stability with lithium metal anodes and extended battery lifespan.
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Smart Images
Figure KR2025022886_02072026_PF_FP_ABST
Abstract
The objective of the present invention is to provide a sulfide-based solid electrolyte having improved lithium ion conductivity, a sulfide-based solid electrolyte preparation method, and an all-solid-state battery comprising the sulfide-based solid electrolyte. The present invention provides a sulfide-based solid electrolyte in the form of a glass ceramic. The sulfide-based solid electrolyte comprises a thio-LISICON region II crystal phase, and the sulfide-based solid electrolyte has a chemical formula represented by (100-z)[{0.75+y / 75+6.25x / 75}Li2S-{0.25-12.5(x / 2) / 75}P2S5-{12.5x / 75}SiS2]-zLiHa, wherein, in the chemical formula, Ha is at least one element selected from halogen elements, and 0<x<0.75, 0<y<2.25 and 15≤z≤30 are satisfied.
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