Halide Spinel Solid Electrolyte for High Li-Ion Conductivity
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Solution Overview
Problem
Current solid electrolyte materials for batteries lack high lithium ion conductivity and are prone to generating hydrogen sulfide when exposed to the atmosphere, posing safety concerns.
Innovation Solution
A solid electrolyte material composed of Li, M (Mg, Zn, or Cd), and X (Cl, Br, or I) with a spinel structure, which enhances lithium ion conductivity by optimizing anion coordination and bond strength, eliminating sulfur and thus preventing hydrogen sulfide generation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If sulfide solid electrolyte materials are used, then lithium ion conductivity is improved, but hydrogen sulfide is generated when exposed to the atmosphere
Solution Approach 1:
The patent changes the chemical composition parameters by replacing sulfur-based anions with halide anions (Cl, Br, I) in the solid electrolyte material. This compositional parameter change eliminates the harmful hydrogen sulfide generation while maintaining the spinel crystal structure and lithium ion conductivity through optimized cation ratios and halide substitution levels.
Solution Approach 2:
The patent converts the harmful sulfur-containing composition into a beneficial sulfur-free halide composition. By eliminating sulfur from the material composition, the harmful hydrogen sulfide generation is prevented while the halide-based solid electrolyte maintains or improves lithium ion conductivity through the spinel structure and controlled halide substitution, turning a harmful characteristic into a safe and beneficial one.
2Object-generated harmful factors
If halide solid electrolyte materials are used, then safety is improved by eliminating hydrogen sulfide generation, but lithium ion conductivity needs to be enhanced
Solution Approach 1:
The patent creates a composite solid electrolyte material with a spinel structure containing Li, M (Mg, Zn, or Cd), and halide anions (Cl, Br, I). This composite composition combines multiple elements in specific ratios to achieve both high lithium ion conductivity and safety. The synergistic interaction between the metal cations and halide anions in the spinel structure enables simultaneous optimization of conductivity and elimination of harmful sulfur-based reactions.
Solution Approach 2:
The patent applies local quality optimization by selectively substituting specific anion sites in the spinel structure with different halide elements (Cl, Br, I) in controlled proportions. This local compositional control at the crystal structure level allows optimization of lithium ion conduction pathways while maintaining the overall safety benefits of sulfur-free composition. The specific ratio of halide elements can be tuned to enhance conductivity in specific regions of the material.
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 material achieves high lithium ion conductivity and stability, ensuring safe operation by facilitating lithium ion conduction without generating hydrogen sulfide, while being cost-effective due to the use of inexpensive elements like Mg, Zn, and Cd.
Implementation Method 1
a solid electrolyte material including Li, M and X wherein M is at least one element selected from the group consisting of Mg, Zn and Cd, and X is at least two elements selected from the group consisting of Cl, Br and I
Data Source
AI summary
The present disclosure provides a solid electrolyte material having high lithium ion conductivity. The solid electrolyte material of the present disclosure includes Li, M and X. M is at least one element selected from the group consisting of Mg, Zn and Cd. X is at least two elements selected from the group consisting of Cl, Br and I.