Amorphous Sulfide Density Control for High Lithium-Ion Conductivity
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Solution Overview
Problem
Current methods for synthesizing sulfide materials fail to control the interfacial distance between metal and chalcogen atoms, limiting the ability to adjust ionic conductivity in lithium batteries, which is crucial for enhancing battery capacity and lifespan.
Innovation Solution
A method involving gas-phase supply of a sulfur source to a metal or alloy, where the sulfidation reaction temperature and rate are adjusted to control the density of amorphous sulfide, allowing for precise control of the interfacial distance and thereby improving lithium ion conductivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional sulfide synthesis methods are used, then sulfide materials can be prepared, but the interfacial distance between metal atoms and chalcogen atoms cannot be controlled, limiting ionic conductivity adjustment
Solution Approach 1:
The patent applies parameter changes by controlling the sulfidation reaction temperature and sulfur source flow rate to precisely adjust the interfacial distance between metal atoms and chalcogen atoms. By varying these parameters, the density of amorphous sulfide is controlled, enabling systematic adjustment of ionic conductivity from 10^-5 to 10^-3 S/cm, thus resolving the contradiction between manufacturing precision and reliability.
2Stability of the object's composition
If high density amorphous sulfide is formed, then material stability is improved, but lithium ion conductivity decreases
Solution Approach 1:
The patent resolves this contradiction by changing the sulfidation reaction parameters (temperature and sulfur flow rate) to control the density of amorphous sulfide. By optimizing these parameters, the patent achieves a balance between material stability and lithium ion conductivity, producing materials with both adequate stability and high ionic conductivity for battery applications.
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
This approach enables the preparation of amorphous sulfides with high ionic conductivity, leading to improved lifespan and stability in lithium-ion batteries by optimizing the interfacial distance between metal and chalcogen atoms.
Implementation Method 1
sulfidation reaction between the sulfur source and the metal or the alloy
Data Source
AI summary
The present invention relates to a method for controlling the density of an amorphous sulfide and, more specifically, to a method for producing an amorphous sulfide having high ionic conductivity of lithium ions by controlling the interplanar distance between a metal atom and a chalcogen atom through the adjustment of the reaction temperature and rate, in carrying out a sulfidation reaction by supplying a sulfur source in a gas phase onto the surface of a metal or an alloy.