Sulfide Solid Electrolyte Reducing Hydrogen Sulfide
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Solution Overview
Problem
Conventional sulfide solid electrolyte materials generate significant hydrogen sulfide when contacting with water, posing safety concerns.
Innovation Solution
A sulfide solid electrolyte material composition containing Li2S and elements from group 14 or 15, with a specific molar fraction of Li2S, is used to minimize cross-linking sulfur and Li2S, reducing hydrogen sulfide generation, and is preferably amorphized through mechanical milling to enhance stability and safety.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional sulfide solid electrolyte materials are used, then high Li ion conductivity is achieved, but significant hydrogen sulfide is generated when contacting with water
Solution Approach 1:
The patent changes the compositional parameters of the sulfide solid electrolyte by controlling the molar fraction of Li2S to be 0.75 or higher, and controlling cross-linking sulfur content to be 5 wt% or less. This parameter optimization reduces the material's reactivity with water while maintaining high Li ion conductivity, thereby reducing hydrogen sulfide generation.
Solution Approach 2:
The patent creates a composite sulfide solid electrolyte material combining Li2S with group 14 or 15 elements (such as Si, Ge, P, As, Sb) in specific ratios. This composite structure reduces cross-linking sulfur formation and improves water stability, significantly reducing hydrogen sulfide generation while maintaining electrochemical performance.
2Reliability
If Li2S content is increased to improve Li ion conductivity, then conductivity increases, but hydrogen sulfide generation increases when contacting with water
Solution Approach 1:
The patent optimizes the Li2S molar fraction to be 0.75 or higher while simultaneously controlling cross-linking sulfur content to 5 wt% or less. This dual parameter control achieves high Li ion conductivity through sufficient Li2S content while preventing excessive hydrogen sulfide generation by limiting cross-linking sulfur that would otherwise increase water reactivity.
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 approach significantly reduces hydrogen sulfide generation, even when the material contacts water, thereby improving the safety and stability of sulfide solid electrolyte batteries.
Implementation Method 1
a sulfide solid electrolyte material using a raw material composition containing Li2S and sulfide of an element of the group 14 or the group 15 in the periodic table; containing substantially no cross-linking sulfur and Li2S
Implementation Method 2
is preferably amorphized through mechanical milling to enhance stability and safety
Data Source
AI summary
The main object of the present invention is to provide a sulfide solid electrolyte material with less hydrogen sulfide generation amount. The present invention solves the above-mentioned problem by providing a sulfide solid electrolyte material obtained by using a raw material composition containing Li2S and sulfide of an element of the fourteenth family or the fifteenth family, characterized by not substantially containing cross-linking sulfur and Li2S.