Halide Solid Electrolyte Composition Without Hydrogen Sulfide Risk
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Solution Overview
Problem
Current all-solid-state batteries face challenges with sulfide solid electrolytes, as they generate hydrogen sulfide when exposed to the atmosphere and have limited lithium ion conductivity, affecting their safety and performance.
Innovation Solution
A lithium-ion-conductive halide solid electrolyte material represented by the chemical formula Li6-4aMaX6, where M is Zr, Hf, or Ti, and X is a halogen, with specific mole fraction ratios, is developed, which is sulfur-free and exhibits high ionic conductivity, suitable for use in all-solid-state batteries.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If sulfide solid electrolyte is used in all-solid-state batteries, then the battery can be constructed with solid electrolyte components, but hydrogen sulfide is generated when exposed to the atmosphere, compromising safety
Solution Approach 1:
The patent changes the chemical composition parameters of the solid electrolyte from sulfide-based to halide-based materials with specific stoichiometric ratios (Li6-4aMaX6 where M=Zr/Hf/Ti, X=halogen). This compositional parameter change eliminates the harmful hydrogen sulfide generation while maintaining solid electrolyte functionality, directly resolving the safety contradiction.
Solution Approach 2:
The patent employs composite halide solid electrolyte materials combining multiple elements (Li, M=Zr/Hf/Ti, X=halogen) in specific ratios. This composite material approach achieves both safety (no hydrogen sulfide) and performance (high ionic conductivity), resolving the contradiction between safety and functionality.
2Reliability
If sulfide solid electrolyte is used in all-solid-state batteries, then the battery structure can be established, but lithium ion conductivity is limited, affecting performance
Solution Approach 1:
The patent optimizes the chemical composition parameters of the halide solid electrolyte (Li6-4aMaX6 with specific mole fractions where 0<a≤1.45) to achieve high lithium ion conductivity. This parameter optimization enables sufficient ion transport for practical battery performance, resolving the contradiction between conductivity and productivity.
3Reliability
If halide solid electrolyte material with specific composition Li6-4aMaX6 is used, then high lithium ion conductivity is achieved, but the material complexity increases compared to simple sulfide electrolytes
Solution Approach 1:
While the halide solid electrolyte composition (Li6-4aMaX6) is more complex than simple sulfides, the patent establishes specific compositional ranges (0<a≤1.45, M=Zr/Hf/Ti, X=halogen) that systematically achieve high conductivity. The complexity is justified and managed through defined compositional parameters that ensure performance, making the trade-off acceptable.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The halide solid electrolyte material enhances the charge-discharge characteristics of batteries, ensuring safety by preventing hydrogen sulfide generation and achieving high lithium ion conductivity, enabling efficient battery operation.
Implementation Method 1
a lithium-ion-conductive halide solid electrolyte material... exhibits high ionic conductivity, enabling efficient battery operation
Data Source
AI summary
A solid electrolyte material according to the present disclosure is represented by the chemical formula Li6-4aMaX6. M denotes at least one element selected from the group consisting of Zr, Hf, and Ti, X denotes at least one halogen element, and a is greater than 0 and less than 1.5.