Oxyhalide Solid Electrolyte Composition for Conductivity Retention
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Solution Overview
Problem
The ionic conductivity of solid electrolytes decreases when they are pulverized or mixed with an organic solvent, which is a concern for the development of high-energy density and high-capacity all-solid-state secondary batteries.
Innovation Solution
A solid electrolyte composition comprising a lithium-based oxyhalide solid electrolyte, a halide, and an organic solvent, where the components are selected from specific groups to maintain high ionic conductivity, including Li, Nb, Ta, O, F, Cl, Br, and I, and the halide is formulated to minimize conductivity loss during processing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the solid electrolyte is pulverized or mixed with an organic solvent, then the solid electrolyte can be processed into desired forms, but the ionic conductivity of the solid electrolyte decreases
Solution Approach 1:
The patent introduces a specific organic solvent as an intermediary substance during the pulverization and mixing process. This solvent is carefully selected to minimize its harmful impact on the solid electrolyte's ionic conductivity while still enabling effective processing. The solvent acts as a mediator that facilitates manufacturing operations without causing excessive degradation of the electrolyte's functional properties.
Solution Approach 2:
The patent modifies the chemical composition parameters of the solid electrolyte by incorporating specific halide components (M2X2) with controlled ratios. This parameter change alters the material's properties to make it more resistant to ionic conductivity loss during processing with organic solvents, thereby resolving the contradiction between processability and conductivity maintenance.
2Manufacturing precision
If the solid electrolyte is mixed with organic solvent for pulverization, then the solid electrolyte can be micronized, but the ionic conductivity is degraded
Solution Approach 1:
The organic solvent serves as a temporary intermediary medium that enables precise particle size control through pulverization. The solvent allows for controlled mixing and size reduction while its specific chemical properties are selected to minimize damage to the solid electrolyte's ionic conductivity, thus achieving both manufacturing precision and reliability.
Solution Approach 2:
The patent creates a composite system consisting of the solid electrolyte particles dispersed in the organic solvent during processing. This composite approach allows for controlled pulverization and size reduction while the specific composition of the composite (electrolyte + solvent + halide additives) is designed to maintain ionic conductivity throughout the processing sequence.
Data Source
AI summary
A solid electrolyte composition of the present disclosure includes: a solid electrolyte including Li, Ml, O, and X1, a halide including M2 and X2; and an organic solvent. The M1 is at least one selected from the group consisting of Nb and Ta. The M2 is at least one selected from the group consisting of Nb and Ta. The X1 is at least one selected from the group consisting of F, Cl, Br, and I. The X2 is at least one selected from the group consisting of F, Cl, Br, and I.