Halide Solid Electrolyte Composition for Lithium Ion Percolation
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Solution Overview
Problem
Existing halide-based solid electrolytes face challenges in achieving high ionic conductivity due to uncontrolled mechanisms and difficulty in designing compositions with optimal metal ion occupancy, which affects their stability and contact properties with active materials.
Innovation Solution
A halide-based solid electrolyte composition with a hexagonal close-packed structure is developed, where the occupancy of metal ions within each layer is limited to 0.444 or less, and the sum of occupancies in two consecutive layers is 0.888 or less, enhancing ionic conductivity by optimizing metal ion distribution and creating enlarged ion conduction paths.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If halide-based solid electrolytes are used to achieve stability and predetermined ionic conductivity, then stability is improved, but ionic conductivity control and design freedom are insufficient
Solution Approach 1:
The patent applies parameter changes by systematically varying the metal ion occupancy parameter (controlling it to be 0.888 or less) in the halide crystal structure. This parameter adjustment enables precise control over ionic conductivity while maintaining structural stability, directly resolving the contradiction between stability and ionic conductivity control.
Solution Approach 2:
The patent employs composite material design by creating halide-based solid electrolytes with specific metal ion compositions and occupancy arrangements. By combining different metal ions in controlled occupancy ratios within the crystal lattice, the material achieves both high stability and tunable ionic conductivity.
2Reliability
If metal ion occupancy is increased to enhance structural stability, then stability is improved, but ionic conductivity decreases due to reduced ion conduction paths
Solution Approach 1:
The patent identifies and controls the critical parameter of metal ion occupancy, setting it to 0.888 or less. This parameter optimization creates a balance where sufficient metal ions maintain structural stability while enough vacancies remain to serve as conduction paths for lithium ions, achieving both stability and high ionic conductivity.
Solution Approach 2:
The patent applies local quality by creating specific occupancy patterns within the crystal structure. Rather than uniform distribution, metal ions are arranged with controlled local occupancy variations, ensuring that certain regions maintain structural integrity while adjacent regions provide open pathways for ion transport.
3Ease of manufacture
If conventional halide compositions are used, then ease of manufacture is improved, but contact properties with active materials are insufficient
Solution Approach 1:
The patent modifies the compositional parameters of conventional halide electrolytes by controlling metal ion occupancy to 0.888 or less. This parameter adjustment maintains compatibility with existing manufacturing processes while significantly improving contact properties with active materials through optimized surface characteristics and ionic conductivity.
Data Source
AI summary
Disclosed is a novel halide-based solid electrolyte composition exhibiting enhanced ionic conductivity, wherein the solid electrolyte composition comprises a lithium yttrium halide with a hexagonal close-packed structure, and when the occupancy of metal ions is defined as the number of metal ions relative to the number of metal ion sites within two consecutive layers constituting a unit cell with a hexagonal close-packed structure in the halide, the sum of the occupancies of metal ions within the two layers is 0.888 or less.