Li-Al Halide Electrolyte Composition for Safe High-Conductivity Batteries
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Solution Overview
Problem
Existing electrolyte materials for batteries, such as sulfide solid electrolytes, generate hydrogen sulfide when exposed to air, posing safety risks and do not provide high lithium ion conductivity, which limits their charge/discharge characteristics and safety.
Innovation Solution
Development of an electrolyte material with the compositional formula Li4-3a-cbAlaMbFxClyBr4-x-y, where M is Mg, Ca, or Zr, and specific inequalities are satisfied, offering high lithium ion conductivity and safety by avoiding sulfur and thus preventing hydrogen sulfide generation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If sulfide solid electrolyte is used, then battery structure is simplified, but hydrogen sulfide is generated when exposed to air causing safety risks
Solution Approach 1:
The patent changes the chemical composition parameters by replacing sulfur-based electrolytes with fluorine-chlorine/bromine-based electrolytes having the formula Li4-3a-cbAlaMbFxClyBr4-x-y. This compositional parameter change eliminates hydrogen sulfide generation while maintaining solid electrolyte benefits, directly resolving the safety issue without increasing structural complexity
Solution Approach 2:
The patent employs composite material design by combining multiple elements (Li, Al, M, F, Cl, Br) in specific proportions to create a new class of solid electrolyte materials. This composite approach achieves both structural simplicity and safety by eliminating sulfur while maintaining the solid state benefits
2Ease of manufacture
If conventional electrolyte materials are used, then manufacturing is simplified, but lithium ion conductivity is insufficient limiting charge/discharge characteristics
Solution Approach 1:
The patent optimizes manufacturing by maintaining a straightforward synthesis process while changing the chemical composition to achieve superior lithium ion conductivity. The electrolyte material with formula Li4-3a-cbAlaMbFxClyBr4-x-y can be manufactured using conventional solid-state reaction methods, preserving ease of manufacture while dramatically improving conductivity performance
Solution Approach 2:
The patent introduces specific elements (Mg, Ca, or Zr) at controlled concentrations within the electrolyte structure to enhance lithium ion conductivity. This local compositional optimization allows conventional manufacturing methods to produce materials with superior transport properties without complex processing steps
3Productivity
If electrolyte material with high lithium ion conductivity is developed, then charge/discharge characteristics improve, but material composition complexity increases
Solution Approach 1:
The patent achieves high lithium ion conductivity and improved charge/discharge characteristics by optimizing the compositional parameters within a defined formula framework (Li4-3a-cbAlaMbFxClyBr4-x-y with specific ranges for a, b, c, x, y). This parameter optimization within a structured formula delivers superior performance without excessive compositional complexity
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 new electrolyte material achieves superior charge/discharge characteristics and safety by maintaining high ionic conductivity and preventing hydrogen sulfide production, enabling successful charging and discharging of batteries while ensuring safety.
Implementation Method 1
an electrolyte material with high lithium ion conductivity
Data Source
AI summary
An electrolyte material is represented by Li4-3a-cbAlaMbFxClyBr4-x-y, wherein M is at least one selected from the group consisting of Mg, Ca, and Zr; c represents a valence of M; and the following five inequalities are satisfied: 0<a<1.33, 0≤b<2, 0<x<4, 0≤y<4, and (x+y)≤4.