Sulfide Solid Electrolyte Synthesis at 170°C for Crystal Structure Control
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Solution Overview
Problem
Existing methods for producing sulfide solid electrolytes require high temperatures, leading to increased energy consumption and the formation of unintended crystal structures, which affects the quality and efficiency of the electrolytes.
Innovation Solution
A method involving the use of hydrogen sulfide at temperatures of 170°C or lower to contact and heat the raw material-containing substance, facilitating the formation of mercapto groups that reduce activation energy, allowing for the production of sulfide solid electrolytes with a target crystal structure without high-temperature requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If high temperature heating is used to produce sulfide solid electrolyte, then the electrolyte can be formed, but energy consumption increases and unintended crystal structures form
Solution Approach 1:
The invention changes the temperature parameter from conventional high temperature (above 200°C) to low temperature (170°C or lower), which fundamentally alters the reaction pathway and kinetics. This parameter change enables the formation of the desired crystal structure while avoiding the energy consumption and side reactions associated with high temperature processing
Solution Approach 2:
The invention uses a composite raw material system comprising lithium sulfide, phosphorus sulfide, and hydrogen sulfide. This composite approach allows the hydrogen sulfide to act as both a reactant and a temperature moderator, enabling low-temperature synthesis while maintaining product quality
2Productivity
If high temperature heating is used to produce sulfide solid electrolyte, then the electrolyte can be formed, but the formation of unintended crystal structures occurs
Solution Approach 1:
By changing the temperature parameter to 170°C or lower, the invention selectively promotes the formation of the desired crystal structure while suppressing competing reactions that lead to unintended crystal phases. This precise temperature control optimizes both production efficiency and crystal structure purity
Solution Approach 2:
Hydrogen sulfide serves as an intermediary substance that facilitates the reaction at low temperatures. It acts as a mediator between the lithium sulfide and phosphorus sulfide, enabling the formation of the desired electrolyte with correct crystal structure without requiring high temperature activation
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 reduces energy input and suppresses the formation of unintended crystal structures, resulting in sulfide solid electrolytes with improved ionic conductivity and productivity.
Implementation Method 1
heating a raw material-containing substance while bringing hydrogen sulfide into contact with the raw material-containing substance (heating (1)), in which a temperature (T1 (°C)) of the heating (1) is 170°C or lower
Data Source
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AI summary
Provided is a method for producing a sulfide solid electrolyte, which is capable of producing a sulfide solid electrolyte having a target crystal structure, is capable of reducing the amount of energy to be input during production, and includes heating a raw material-containing substance while bringing hydrogen sulfide into contact with the raw material-containing substance (heating (1)), in which the temperature (T1 (°C)) of the heating (1) is 170°C or lower.