Solid Electrolyte Composition Without Sulfides for Stable Li-Ion Conduction
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Solution Overview
Problem
Existing solid electrolyte materials, such as sulfide solid electrolytes, generate hydrogen sulfide when exposed to the atmosphere, posing safety concerns and having limitations in ionic conductivity and stability, especially at varying temperatures.
Innovation Solution
A novel solid electrolyte material composed of Li, M (Ti, Zr, or Hf), O, X (F, Cl, Br, or I), and A (P or B), with specific molar ratios optimized for high lithium-ion conductivity, stability, and sulfur-free composition, enhancing ionic conductivity and safety by avoiding sulfur inclusion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If sulfide solid electrolyte materials are used, then ionic conductivity can be achieved, but hydrogen sulfide is generated when exposed to the atmosphere causing safety concerns
Solution Approach 1:
The patent changes the chemical composition parameters by replacing sulfur-based electrolytes with oxygen and halogen-based compounds (Li-M-O-X system where M=Ti/Zr/Hf, X=F/Cl/Br/I), eliminating the source of hydrogen sulfide generation while maintaining high ionic conductivity through optimized molar ratios (1.0≤Li/M≤3.0, 0.2≤O/X≤0.7)
Solution Approach 2:
The patent creates a composite solid electrolyte material combining lithium compounds with metal oxides/halides (Li2O-MOx-MXy system) that integrates the advantages of high ionic conductivity with improved chemical stability and safety, avoiding the harmful properties of sulfide-based materials
2Duration of action of moving object
If existing solid electrolyte materials are used, then battery operation is possible, but stability varies at different temperatures
Solution Approach 1:
The patent optimizes compositional parameters (molar ratios of Li/M, O/X, and A/M) to achieve a balanced crystal structure that maintains stable ionic conductivity across wide temperature ranges, with the Li/M ratio of 1.0-3.0 providing optimal thermal stability
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 novel solid electrolyte material achieves high lithium-ion conductivity (0.42 mS/cm or more near room temperature) and maintains stability across a wide temperature range, ensuring safe and efficient battery operation without generating hydrogen sulfide.
Implementation Method 1
the solid electrolyte material according to the first embodiment can have a practical lithium-ion conductivity, and has a high lithium-ion conductivity. Here, a high lithium-ion conductivity is, for example, 0.42 mS/cm or more near room temperature
Data Source
AI summary
A solid electrolyte material of the present disclosure includes: Li; M; O; X; and A. The M is at least one selected from the group consisting of Ti, Zr, and Hf. The X is at least one selected from the group consisting of F, Cl, Br, and I. The A is at least one selected from the group consisting of P and B. A molar ratio of the Li to the M is 1.0 or more and 3.0 or less. A molar ratio of the O to the X is 0.2 or more and 0.7 or less. A molar ratio of the A to the M is 0.02 or more and 0.80 or less.