Argyrodite Sulfide Solid Electrolyte With Higher Ion Conductivity
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Solution Overview
Problem
Existing sulfide solid electrolytes with an argyrodite-type crystal structure have ion conductivity that is not sufficiently high, limiting their performance in lithium ion batteries.
Innovation Solution
A sulfide solid electrolyte composed of lithium, phosphorus, sulfur, and chlorine with a molar ratio of chlorine to phosphorus greater than 1.0 and 1.9 or less, and a lattice constant of 9.750 Å to 9.820 Å, optimized through mechanical stress and controlled heat treatment to enhance ion conductivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If an argyrodite-type crystal structure is used in sulfide solid electrolyte, then crystal stability is improved, but ion conductivity is not sufficiently high
Solution Approach 1:
The patent changes the chemical composition parameters by incorporating chlorine into the argyrodite-type crystal structure with a molar ratio of Cl/(Li+P) between 0.2 and 0.4. This parameter modification optimizes the crystal structure to achieve both high stability and high ion conductivity, resolving the contradiction between structural stability and ion transport performance
Solution Approach 2:
The patent creates a composite sulfide solid electrolyte by combining multiple elements (Li, P, S, Cl) to form a new composite material with the formula Li6-a-bPS5-cSb cCl d. This composite approach integrates the beneficial properties of different elements to achieve both crystal stability and enhanced ion conductivity simultaneously
Data Source
AI summary
A method for producing a sulfide solid electrolyte including an argyrodite-type crystal structure includes: pulverizing and mixing raw materials with a pulverizer to prepare an intermediate containing a glass component, wherein the raw materials include lithium, phosphorus, sulfur, and chlorine; and heat-treating the intermediate at 360 to 500° C. A molar ratio of the chlorine to the phosphorus, c (CIP), of the raw materials is greater than 1.0 and 1.9 or less.