Halogenated Sulfide Electrolyte Composite for Thermal Crystal Stability
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Solution Overview
Problem
Conventional liquid electrolyte lithium-ion batteries pose safety risks due to flammable organic solvents, necessitating complex safety devices, while solid-state batteries using solid electrolytes reduce these risks but require improved stability and safety.
Innovation Solution
Development of sulfide solid electrolytes with an argyrodite-type crystal structure, specifically Li3P2S6X, where X is a halogen, and a composite composition comprising an Argyrodite phase, which are produced through precise mixing of Li2S, P2S5, and LiX precursors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If liquid electrolyte is used in lithium-ion batteries, then the battery can operate with conventional design, but the flammable organic solvent creates safety risks and requires complex safety devices
Solution Approach 1:
The patent changes the physical state parameter of the electrolyte from liquid to solid, specifically using sulfide solid electrolytes with argyrodite-type crystal structure. This phase transition eliminates the flammability issue inherent in liquid organic solvents while maintaining ionic conductivity, thereby improving safety without requiring complex safety devices
Solution Approach 2:
The patent employs composite material design by combining sulfide solid electrolytes with specific crystal structures (argyrodite-type) to achieve both safety and performance. The composite nature of the solid electrolyte material provides inherent safety while maintaining battery functionality
2Reliability
If solid-state battery with solid electrolyte is used, then safety is improved by eliminating flammable solvents, but the crystal structure stability over temperature range needs improvement
Solution Approach 1:
The patent optimizes the compositional parameters of the sulfide solid electrolyte by incorporating specific ratios of Li2S, P2S5, and LiX (where X is halogen). This compositional adjustment stabilizes the argyrodite-type crystal structure across wide temperature ranges, preventing phase transitions that would compromise battery performance
Solution Approach 2:
The patent introduces local structural modifications by incorporating halogen elements (X) into the argyrodite crystal lattice. This local compositional adjustment enhances the overall thermal stability of the crystal structure while maintaining the desired ionic conductivity properties
Data Source
AI summary
The present disclosure provides an electrolyte composition. The present disclosure also provides a composite composition comprising the electrolyte composition and an Argyrodite phase. Furthermore, the present disclosure is directed to a method of making and using the electrolyte composition.