Halide Solid Electrolyte Composition Without Hydrogen Sulfide Risk
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Solution Overview
Problem
Existing all-solid-state batteries face challenges with lithium ion conductivity and safety issues, particularly with sulfide solid electrolytes that generate hydrogen sulfide when exposed to the atmosphere, limiting their performance and reliability.
Innovation Solution
A halide solid electrolyte material represented by the chemical formula Li6-4b+2ab(Zr1-aMa)bX6, where M is selected from Mg, Ca, Sr, or Zn, and X is a halogen, offering high lithium ion conductivity and safety by avoiding sulfur and hydrogen sulfide generation, and can be used in both primary and secondary batteries.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If sulfide solid electrolyte is used in all-solid-state batteries, then lithium ion conductivity can be achieved, but hydrogen sulfide is generated when exposed to atmosphere causing safety issues
Solution Approach 1:
The patent changes the chemical composition parameters by substituting sulfur-based electrolytes with halide-based electrolytes having the formula Li6-4b+2ab(Zr1-aMa)bX6. This compositional parameter change eliminates hydrogen sulfide generation while maintaining lithium ion conductivity through careful selection of halogen elements (F, Cl, Br, I) and metal elements (Zr, Hf, Mg, Ca, Sr, Ba, Zn).
Solution Approach 2:
The patent employs composite material design by combining multiple elements in a specific structure: Li6-4b+2ab(Zr1-aMa)bX6 where M represents Mg, Ca, Sr, Ba, or Zn. This composite approach achieves high lithium ion conductivity while preventing harmful hydrogen sulfide generation, resolving the contradiction between performance and safety.
2Productivity
If conventional solid electrolyte materials are used, then battery structure can be simplified, but lithium ion conductivity and performance are limited
Solution Approach 1:
The patent systematically varies compositional parameters (a and b values) to optimize lithium ion conductivity. By controlling the substitution levels of M elements into Zr sites and adjusting halogen composition, the patent achieves enhanced ionic conductivity while managing material complexity through defined compositional ranges (0 < a ≤ 0.5, 0 < b ≤ 1.5).
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 lithium ion conductivity and ensures safe operation by preventing hydrogen sulfide generation, enabling batteries with good charge-discharge characteristics and high ionic conductivity, suitable for various battery applications.
Implementation Method 1
a halide solid electrolyte material represented by the following chemical formula (I): Li6-4b+2ab(Zr1-aMa)bX6... having high lithium ion conductivity
Data Source
AI summary
A halide solid electrolyte material according to the present disclosure is represented by the chemical formula Li6-4b+2ab(Zr1-aMa)bX6 (I), wherein M denotes at least one element selected from the group consisting of Mg, Ca, Sr, Ba, and Zn, X denotes at least one halogen element, and two mathematical formulae 0<a<1 and 0<b<1.5 are satisfied.