LiaPSbXc Solid Electrolyte Powder With Low L* for Composite Layers
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Solution Overview
Problem
All-solid-state lithium ion batteries face challenges with high electrical resistance and low output current due to the need for electrolytes with high conductivity that maintain performance over time, and existing sulfide-based solid electrolytes with high L* values in the L*a*b* color system are difficult to use in composite layers.
Innovation Solution
A powder of solid material particles with the formula LiaPSbXc, where X represents a halogen element, and the L* value in the L*a*b* color system is less than 60.0, is developed using a process involving mixing starting materials with a carbonated solvent and heating to create a paste, which is then dried and pressed into pellets, achieving improved hydrophobicity and resistance to ageing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If sulfide-based solid electrolytes with high L* values are used, then conductivity is improved, but ease of use in preparing composite layers deteriorates
Solution Approach 1:
The patent changes the L* value parameter from the conventional high range (>60) to a lower range (40-60), which fundamentally alters the material's properties. This parameter change simultaneously improves ease of use in composite layer preparation while maintaining acceptable conductivity levels, resolving the technical contradiction between conductivity and ease of operation.
2Object-affected harmful factors
If all-solid-state lithium ion batteries are formed by solidifying components, then safety is improved by eliminating flammable solvents, but electrical resistance increases and output current decreases
Solution Approach 1:
The patent employs parameter changes in the electrolyte composition (using formula LiaPSbXc with specific stoichiometric ranges and halogen elements) to optimize the balance between solid-state safety and electrical conductivity. By precisely controlling compositional parameters within specified ranges, the patent achieves reduced electrical resistance while maintaining the safety benefits of solid-state electrolytes.
Data Source
AI summary
The present disclosure relates to a powder of solid material particles of formula (I): LiaPSbXc wherein—X represents at least one halogen element; —a represents a number from 2.0 to 7.0; —b represents a number from 3.0 to 6.0; and —c represents a number from 0 to 3.0, wherein the powder has a d50-value of less than 50 μm, characterised in that its L* value in the L*a*b* color system is less than 60.0. The present disclosure also relates to a process for preparing such powder, as well as to the use of such powder for notably manufacturing solid electrolytes or battery articles.