Halide Ion Conductor Binder Composition for Preserving Ionic Conductivity
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Solution Overview
Problem
The existing ion conductor materials for batteries, particularly those using halide solid-electrolytes, face a reduction in ionic conductivity when combined with resin binders due to interactions at binding sites, leading to decreased charge-discharge efficiency.
Innovation Solution
An ion conductor material comprising a solid-electrolyte with Li, M, and X, where M is a metal or metalloid and X is F, Cl, or I, is developed, with a resin binder having a molar ratio of modification groups to the solid-electrolyte less than or equal to 0.0002, enhancing ionic conductivity and charge-discharge efficiency while maintaining binding strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a resin binder with modification groups is used to increase adhesion strength, then adhesion strength between solid electrolyte and electrodes is improved, but ionic conductivity of the solid electrolyte is reduced
Solution Approach 1:
The patent changes the concentration parameter of modification groups in the resin binder, specifically limiting the molar ratio of modification groups to solid electrolyte to 0.0002 or less. This parameter optimization allows the resin binder to provide adequate adhesion strength while minimizing its negative impact on ionic conductivity, thus resolving the contradiction between these two properties.
2Strength
If modification groups are added to resin binder to enhance binding strength, then binding strength is improved, but charge-discharge efficiency is reduced
Solution Approach 1:
The patent optimizes the concentration parameter of modification groups by limiting the molar ratio to 0.0002 or less. This parameter control ensures that the resin binder provides necessary binding strength for electrode attachment while minimizing interference with ion transport pathways, thereby maintaining high charge-discharge efficiency.
3Strength
If resin binder is used to maintain structural integrity, then mechanical strength is improved, but ionic conductivity is reduced
Solution Approach 1:
The patent carefully controls the concentration parameter of modification groups in the resin binder, limiting the molar ratio to 0.0002 or less. This optimization allows the resin binder to provide sufficient mechanical strength for structural integrity while minimizing its impact on ionic conductivity, thus resolving the contradiction between mechanical strength and ionic conductivity.
Data Source
AI summary
An ion conductor material includes a solid-electrolyte material and a resin binder. The solid-electrolyte material includes Li, M, and X. The M is at least one selected from the group consisting of metal and metalloid elements other than Li. The X is at least one selected from the group consisting of F, Cl, Br, and I. The molar ratio of a modification group included in the resin binder to the solid-electrolyte material is less than or equal to 0.0002.