Sulfide Solid Electrolyte Crystallization for Ion Conductivity
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Solution Overview
Problem
Existing sulfide solid electrolytes lack discussion on ion conductivity derived from their chemical structure, limiting their performance in lithium secondary batteries.
Innovation Solution
A sulfide solid electrolyte with a crystallized glass composition of yLi2S.(100-x-y)P2S5.xP2O5, where 0<x<25 and 67<y<80, forming orderly lithium ion conducting paths and reducing hydrogen sulfide generation, is developed through a method involving raw material preparation, amorphization, and crystallization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If an amorphous glass structure is used in sulfide solid electrolyte, then the electrolyte can be manufactured with simpler process, but the lithium ion conductivity is insufficient due to disordered ion conducting paths
Solution Approach 1:
The patent applies phase transition by transforming the amorphous glass structure into a crystallized glass structure through controlled crystallization treatment. This phase transition from amorphous to crystalline state organizes the previously disordered lithium ion conducting paths into ordered structures, significantly improving lithium ion conductivity while maintaining the glass matrix structure that enables manufacturability
Solution Approach 2:
The patent creates a composite material system consisting of crystallized glass formed within a glass matrix. The crystallized glass regions provide ordered lithium ion conducting paths, while the surrounding glass matrix maintains structural integrity and manufacturability, combining the advantages of both amorphous and crystalline structures
2Stability of the object's composition
If crosslinking sulfur is present in the sulfide solid electrolyte, then the structural stability is improved, but hydrogen sulfide generation increases reducing safety
Solution Approach 1:
The patent applies the extraction principle by removing crosslinking sulfur from the electrolyte composition through controlled crystallization. The crystallization process selectively forms ortho composition structures that do not contain crosslinking sulfur, thereby eliminating the source of hydrogen sulfide generation while maintaining structural stability through the crystallized glass framework
3Device complexity
If disordered lithium ion conducting paths are present, then the electrolyte structure is simpler, but the lithium ion conducting ability is reduced
Solution Approach 1:
The patent utilizes phase transition from amorphous to crystalline state to transform disordered lithium ion conducting paths into ordered structures. The crystallization process creates well-defined conducting paths within the glass matrix, improving lithium ion conducting ability without significantly increasing overall structural complexity
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 sulfide solid electrolyte exhibits enhanced lithium ion conductivity and reduced hydrogen sulfide generation, improving safety and performance in lithium secondary batteries.
Implementation Method 1
amorphizing the raw material composition
Implementation Method 2
crystallizing a glass obtained by the amorphization step by heating
Data Source
AI summary
A sulfide solid electrolyte with excellent ion conductivity and a method for producing a crystallized glass contained in the sulfide solid electrolyte. A sulfide solid electrolyte comprising a crystallized glass represented by the following chemical formula yLi2S•(100-x-y)P2S5•xP2O5, wherein 0<x<25 and 67<y<80.