Amorphizing Crystallized Sulfide Solid Electrolyte
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Solution Overview
Problem
Crystallized Li2S—P2S5-based sulfide solid electrolyte materials exhibit low Li ion conductivity and tend to generate hydrogen sulfide, limiting their application in high-performance batteries.
Innovation Solution
A method involving mechanical milling and heat treatment is employed to amorphize and then crystallize a sulfide solid electrolyte material with a specific Li2S:P2S5 ratio, reducing grain boundary resistivity and minimizing residual Li2S to enhance Li ion conductivity while minimizing hydrogen sulfide generation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If crystallized Li2S—P2S5-based sulfide solid electrolyte material is used, then hydrogen sulfide generation is reduced, but Li ion conductivity becomes low
Solution Approach 1:
The invention changes the physical state parameter of the sulfide solid electrolyte material from crystallized to amorphous. This parameter change resolves the contradiction by achieving high Li ion conductivity in the amorphous state while the crystallized state provides reduced hydrogen sulfide generation, allowing the material to be processed in crystallized form and then converted to amorphous form for final use.
Solution Approach 2:
The invention utilizes phase transition by converting the sulfide solid electrolyte material from a crystallized state to an amorphous state through mechanical milling or heat treatment. This phase transition enables the material to achieve high Li ion conductivity characteristic of amorphous structures while having been previously processed in a crystallized state that minimizes hydrogen sulfide generation.
2Reliability
If amorphization treatment is applied to crystallized sulfide solid electrolyte material, then Li ion conductivity is improved, but residual Li2S increases
Solution Approach 1:
The invention applies preliminary action by first crystallizing the sulfide solid electrolyte material to reduce residual Li2S content, and then subsequently applying amorphization treatment to improve Li ion conductivity. This sequence of operations allows the material to benefit from both the purity advantages of crystallization and the conductivity advantages of the amorphous state.
Solution Approach 2:
The invention changes the physical state parameter from amorphous to crystallized and then back to amorphous through controlled transitions. The first transition (amorphous to crystallized) reduces residual Li2S, and the second transition (crystallized to amorphous) improves Li ion conductivity, optimizing both parameters through sequential parameter changes.
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 results in a sulfide solid electrolyte material with improved Li ion conductivity and reduced hydrogen sulfide generation, suitable for high-output lithium solid state batteries with enhanced safety.
Implementation Method 1
an amorphization treatment step for applying an amorphization treatment to the above raw material composition and obtaining an amorphized sulfide solid electrolyte material
Implementation Method 2
a crystallization treatment step for applying crystallization treatment by heat treatment to the amorphized sulfide solid electrolyte material and obtaining the crystallized sulfide solid electrolyte material
Data Source
AI summary
A method for producing a sulfide solid electrolyte material having a small amount of hydrogen sulfide generation and a high Li ion conductivity. To achieve the above, a method for producing a sulfide solid electrolyte material is provided, including steps of: a providing step for providing a crystallized sulfide solid electrolyte material prepared by using a raw material composition containing Li2S and P2S5; and an amorphizing step for applying amorphization treatment to the crystallized sulfide solid electrolyte material.