Sulfide Solid Electrolyte Heat Treatment With Pressurized Boundary Sealing
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Solution Overview
Problem
Existing methods for producing sulfide solid electrolytes face challenges in preventing the adhesion of sulfur impurities to heat treatment apparatuses, particularly at the boundary between rotating and fixed members, which hinders continuous production and affects battery performance.
Innovation Solution
A method and apparatus that utilize a pressurizing chamber to maintain a higher pressure at the boundary between the rotating and fixed members during heat treatment, preventing sulfur adhesion and ensuring stable production of high-performance sulfide solid electrolytes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If heat treatment is performed to crystallize sulfide glass and remove elemental sulfur, then battery performance is improved, but sulfur adhesion to the heat treatment apparatus occurs at the boundary between rotating and fixed members
Solution Approach 1:
A pressurizing chamber is introduced as an intermediary component between the heating portion and the external environment. This chamber maintains a pressure higher than the heating portion, creating a pressure barrier that prevents sulfur vapor from reaching and adhering to the boundary between rotating and fixed members, thus solving the sulfur adhesion problem while maintaining heat treatment effectiveness
Solution Approach 2:
The pressure parameter is changed and controlled to be higher in the pressurizing chamber compared to the heating portion. This pressure gradient is specifically designed to prevent sulfur vapor migration toward the rotating member boundary, allowing continuous heat treatment without sulfur adhesion issues
2Productivity
If continuous processing is performed for mass production, then productivity is improved, but rotation of the rotating member is hindered by sulfur adhesion at the boundary with fixed members
Solution Approach 1:
The pressurizing chamber serves as a protective intermediary that isolates the rotating member boundary from sulfur vapor exposure. By maintaining higher pressure in this chamber, sulfur adhesion is prevented, ensuring the rotating member can continue to rotate smoothly during continuous mass production operations
Solution Approach 2:
The pressurizing chamber enables continuous heat treatment operations by preventing sulfur adhesion that would otherwise hinder rotating member operation. This allows the mass production process to proceed without interruption for cleaning or maintenance, maintaining continuous productive action
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 method and apparatus effectively prevent sulfur adhesion, enabling stable and continuous production of sulfide solid electrolytes with improved battery performance by controlling pressure in the pressurizing chamber to be higher than the heating portion or outside air pressure.
Implementation Method 1
controlling a pressure in the pressurizing chamber to be higher than a pressure in the heating portion or outside air pressure
Implementation Method 2
heat-treating the sulfide solid electrolyte material
Implementation Method 3
crystallize the sulfide glass and remove elemental sulfur mixed as an impurity
Data Source
AI summary
A method for producing a sulfide solid electrolyte includes supplying a sulfide solid electrolyte material to a heat treatment apparatus and heat-treating the sulfide solid electrolyte material. The heat treatment apparatus includes: a heating portion configured to heat-treat the sulfide solid electrolyte material; a rotating member configured to convey the sulfide solid electrolyte material while heating the sulfide solid electrolyte material by the heating portion; a stationary fixed member that is disposed on an end portion side in an axial direction of the rotating member; and a pressurizing chamber configured to pressurize a boundary portion between the rotating member and the fixed member. The sulfide solid electrolyte material is heat-treated while controlling a pressure in the pressurizing chamber to a pressure higher than a pressure in the heating portion and an outside air pressure.