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Toward High-Quality Sulfide Solid Electrolytes: A Liquid-Phase Approach Featured with an Interparticle Coupled
Aiguo Han1, Shijie Xu1, Xinyu Wang1
1Institute of Molecular Plus, Department of Chemistry, School of Chemical Engineering and Technology, Tianjin University, Tianjin, 300072, China.
Small (Weinheim an Der Bergstrasse, Germany)
|December 26, 2023
Summary
This study introduces a novel suspension-based solvothermal method for synthesizing high-purity sulfide solid electrolytes (SSEs). This approach overcomes challenges in liquid-phase synthesis, enabling better solid-state battery performance.
Area of Science:
- Materials Science
- Electrochemistry
- Chemical Engineering
Background:
- Sulfide solid electrolytes (SSEs) are crucial for solid-state batteries (SSBs) but face synthesis challenges.
- Liquid-phase synthesis offers scalability but suffers from low purity, difficult solvents, and poor performance.
Purpose of the Study:
- To develop an improved synthesis method for SSEs.
- To address purity, solvent, and performance issues in current liquid-phase synthesis.
Main Methods:
- A suspension-based solvothermal method using single, oxygen-free solvents was employed.
- Experimental and theoretical analyses investigated "interparticle-coupled unification" in nonpolar solvents.
- Four alkane solvents and four SSE types were tested for method generality.
Main Results:
- The method successfully generated uniform composites from insoluble precursors.
- Impurity origins in conventional methods were identified, leading to solvent selection.
- Electrochemical assessments showed competitive performance for three synthesized SSEs.
Conclusions:
- The suspension-based solvothermal method offers a viable solution for high-purity SSE synthesis.
- This approach enhances SSE properties, showing significant potential for practical solid-state battery applications.
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