Sulfide Solid Electrolyte Crystallization via Inert Atmosphere
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Solution Overview
Problem
Heat treatment during the crystallization step can deteriorate sulfide solid electrolytes, thereby worsening lithium ion conductivity, which is essential for improving the capacity and power of all-solid-state batteries using sulfide solid electrolytes.
Innovation Solution
Limiting the ambient concentration of oxygen-containing organic compounds to no more than 100 ppm during the heat treatment step in the crystallization process of sulfide solid electrolytes, along with preferred inclusion of Li, S, and P, and 10-30 mol% halogen, and conducting wet grinding with drying at reduced pressure to prevent deterioration and enhance lithium ion conductivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If heat treatment is performed on sulfide solid electrolytes at temperature no less than crystallization temperature to make glass ceramics, then lithium ion conductivity is improved, but sulfide solid electrolytes deteriorate due to chemical reaction with oxygen containing organic compounds
Solution Approach 1:
The patent applies the inert atmosphere principle by controlling the ambient environment during heat treatment to maintain oxygen containing organic compound concentration at no more than 100 ppm. This is achieved through inert gas protection (such as nitrogen or argon atmosphere) or vacuum conditions, preventing chemical reactions between the sulfide solid electrolyte and oxygen containing organic compounds while enabling successful crystallization and improvement of lithium ion conductivity.
2Volume of moving object
If wet grinding by means of mechanical milling is employed for micronization, then sulfide solid electrolytes are micronized, but oxygen containing organic compounds are introduced into the system
Solution Approach 1:
The patent applies the extraction principle by removing oxygen containing organic compounds from the system after wet grinding. This is achieved through vacuum drying or inert gas drying processes that extract and remove the organic compounds introduced during mechanical milling, reducing their concentration to no more than 100 ppm before the heat treatment step, thereby preventing deterioration during crystallization.
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 method effectively prevents deterioration and significantly improves lithium ion conductivity of sulfide solid electrolytes, making them suitable for high-performance all-solid-state batteries.
Implementation Method 1
a step of crystallizing a sulfide solid electrolyte with heat treatment
Implementation Method 2
wet grinding by means of mechanical milling is employed for micronization
Implementation Method 3
a step of drying a specimen after the wet grinding at a reduced pressure
Data Source
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AI summary
Provided is a method for manufacturing a sulfide solid electrolyte which can prevent deterioration of the sulfide solid electrolyte and can improve the lithium ion conductivity. In a step of crystallizing the sulfide solid electrolyte with heat treatment, the ambient concentration of oxygen containing organic compounds is no more than 100 ppm.