Halide Solid Electrolyte Composition for High Lithium-Ion Conductivity
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Solution Overview
Problem
Existing solid electrolyte materials for batteries have limitations in achieving high lithium-ion conductivity, which affects the performance and efficiency of lithium-ion batteries.
Innovation Solution
A solid electrolyte material composed of Li, M1, M2, and X, where M1 includes at least two elements from Ca, Mg, and Zn, M2 includes at least one element from Y, Gd, and Sm, and X includes at least one element from F, Cl, Br, and I, is developed to enhance lithium-ion conductivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional solid electrolyte materials are used, then the battery structure can be simplified, but the lithium-ion conductivity is insufficient
Solution Approach 1:
The patent changes the chemical composition parameters of the solid electrolyte by incorporating specific combinations of alkaline earth metals (Ca, Sr, Ba), rare earth metals (Y, Gd, Sm), and halogens (F, Cl, Br, I) in controlled ratios. This compositional parameter optimization achieves lithium-ion conductivity of 1 mS/cm or more at room temperature, resolving the contradiction between reliability and productivity.
Solution Approach 2:
The patent creates a composite solid electrolyte material by combining multiple metal elements (at least two from Ca, Sr, Ba and at least one from Y, Gd, Sm) with halogen elements. This multi-element composite structure synergistically enhances ionic conductivity while maintaining structural stability, thereby improving both reliability and charge-discharge efficiency.
2Reliability
If sulfur-containing solid electrolyte materials are used, then lithium-ion conductivity can be improved, but hydrogen sulfide generation occurs compromising safety
Solution Approach 1:
The patent eliminates sulfur from the electrolyte composition entirely, replacing it with halogen elements (F, Cl, Br, I). This substitution not only prevents hydrogen sulfide generation but also maintains high lithium-ion conductivity through the optimized multi-element composition, effectively converting a harmful material system into a safe one.
Solution Approach 2:
The patent changes the chemical composition parameter by setting sulfur content to zero and optimizing the ratios of halogen elements in combination with alkaline earth and rare earth metals. This parameter modification achieves the dual goal of eliminating harmful hydrogen sulfide generation while maintaining high ionic conductivity for reliable battery operation.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The proposed solid electrolyte material achieves high lithium-ion conductivity of 1 mS/cm or more at room temperature, leading to improved charge and discharge characteristics in batteries, including all-solid-state batteries.
Implementation Method 1
The solid electrolyte material according to the present disclosure has a high lithium-ion conductivity
Data Source
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AI summary
The solid electrolyte material of the present disclosure consists of Li, M1, M2, and X, wherein M1 is at least two selected from the group consisting of Ca, Mg, and Zn; M2 is at least one selected from the group consisting of Y, Gd, and Sm; and X is at least one selected from the group consisting of F, Cl, Br, and I.