Composite Solid Electrolyte for Safer All-Solid-State Batteries
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Summary
Problems
Sulfide-based solid electrolytes in all-solid-state batteries are highly reactive to moisture, leading to the generation of toxic hydrogen sulfide gas and degradation, which compromises their safety and performance.
Innovation solutions
A composite solid electrolyte is developed with sulfide-based solid electrolyte particles coated with a polymer layer having a Mooney viscosity of 30 to 110, incorporating repeating units from acrylonitrile and butadiene monomers, which enhances atmospheric stability and chemical resistance.
TRIZ Analysis
Specific contradictions:
General conflict description:
Principle concept:
If a single material is used for the solid electrolyte, then the manufacturing process is simple, but it is difficult to simultaneously achieve high ionic conductivity, high mechanical strength, and low interfacial resistance
Why choose this principle:
The patent employs a composite solid electrolyte consisting of a sulfide-based solid electrolyte layer and an oxide-based solid electrolyte layer. The sulfide layer provides high ionic conductivity, while the oxide layer provides high mechanical strength and stability. This composite structure resolves the contradiction by combining materials with complementary properties rather than using a single material.
Principle concept:
If a single material is used for the solid electrolyte, then the manufacturing process is simple, but it is difficult to simultaneously achieve high ionic conductivity, high mechanical strength, and low interfacial resistance
Why choose this principle:
The patent applies different material compositions to different layers of the solid electrolyte. The sulfide-based layer is optimized for ionic conductivity in the region close to the electrode interfaces, while the oxide-based layer is optimized for mechanical strength and stability in the bulk region. This local differentiation of material properties allows each layer to perform its specific function optimally.
Application Domain
Data Source
AI summary:
A composite solid electrolyte is developed with sulfide-based solid electrolyte particles coated with a polymer layer having a Mooney viscosity of 30 to 110, incorporating repeating units from acrylonitrile and butadiene monomers, which enhances atmospheric stability and chemical resistance.
Abstract
The present invention relates to a composite solid electrolyte including sulfide-based solid electrolyte particles, and a polymer coating layer formed on the sulfide-based solid electrolyte particles, wherein the polymer coating layer includes a polymer having a Mooney viscosity (ML1+4, 100 °C) of 30 to 110, and an all-solid-state battery including the composite solid electrolyte.