Halogen-Modified Crystalline Solid Electrolyte for Polar Solvent Compatibility
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Solution Overview
Problem
Sulfide-based solid electrolytes have high reactivity, limiting the solvents that can be used for slurry formation and resulting in decreased conductivity when immersed in certain solvents.
Innovation Solution
A crystalline solid electrolyte represented by the compositional formula LixSiyPzSaHaw, where Ha includes Br, Cl, I, or F, with specific mass content ranges for S, Si, and Ha, allowing high chemical stability and maintenance of conductivity when using polar solvents like NMP, acetone, or DMF.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If sulfide-based solid electrolyte is used, then high lithium ion conductivity is achieved, but chemical stability deteriorates due to high reactivity with solvents
Solution Approach 1:
The invention changes the chemical composition parameters of the solid electrolyte by introducing halogen elements (F, Cl, Br, I) into the Li-P-S system, creating Li1+x-yP1-yS4-zHx compounds. This compositional modification reduces the reactivity with solvents while maintaining high lithium ion conductivity, resolving the contradiction between conductivity and chemical stability.
Solution Approach 2:
The invention creates a composite solid electrolyte material by combining Li-P-S base structure with halogen elements. The resulting Li1+x-yP1-yS4-zHx compound integrates the high conductivity特性 of sulfide-based electrolytes with improved chemical stability from halogen substitution, achieving both desired properties simultaneously.
2Stability of the object's composition
If non-polar solvents are used for slurry preparation, then chemical stability is improved, but ease of manufacture deteriorates due to limited solvent options
Solution Approach 1:
The invention modifies the chemical parameters of the solid electrolyte composition to reduce its reactivity, enabling the use of polar solvents with higher dielectric constants. This allows manufacturers to choose from a broader range of solvents including NMP, acetone, and DMF, significantly improving ease of manufacture while maintaining chemical stability.
3Reliability
If conventional Li3PS4 solid electrolyte is used, then high conductivity is achieved, but adaptability deteriorates due to limited solvent compatibility
Solution Approach 1:
The invention develops a composite solid electrolyte system Li1+x-yP1-yS4-zHx that combines the high conductivity特性 of Li3PS4 with halogen-modified structures. This composite approach enables the material to maintain excellent conductivity while gaining compatibility with multiple solvent types, thereby improving adaptability for different manufacturing processes.
Data Source
AI summary
Provided is a novel crystalline solid electrolyte which can be used as a dispersion medium when slurrying polar solvents such as NMP, acetone, and DMF, and for which a decrease in conductivity when the crystalline solid electrolyte is immersed in said solvents can be suppressed. Proposed is a crystalline solid electrolyte represented by Compositional Formula: LixSiyPzSaHaw (here, Ha includes one or two or more of Br, Cl, I, and F, and 2.4<(x−y)/(y+z)<3.3), in which the content of S is 55 to 73% by mass, the content of Si is 2 to 11% by mass, and the content of a Ha element is 0.02% by mass or more.