Argyrodite Composite Electrolyte for Solid-State Battery Adhesion
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Solution Overview
Problem
The commercialization of solid-state batteries is hindered by the challenge of maintaining contact between solid-state electrolytes and electrodes, as inorganic materials like sulfide glasses and ceramics are brittle and lack adequate adhesion, leading to high bulk electrolyte resistance and dendrite formation due to voids.
Innovation Solution
A method involving the use of argyrodite precursor compounds in a polymer film, where the film is heated to react the precursors and form argyrodite, and the film is processed to achieve high ionic conductivity and mechanical compliance, allowing for dense, thin films that resist dendrite formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If inorganic solid-state electrolytes (sulfide glasses and ceramics) are used to achieve high ionic conductivity, then ionic conductivity is improved (over 10^-4 S/cm), but adhesion to electrodes deteriorates and mechanical brittleness increases
Solution Approach 1:
The patent creates a composite material system where argyrodite inorganic particles (0.1-10 micrometer size) are dispersed within an organic polymer electrolyte matrix. This composite structure combines the high ionic conductivity of inorganic argyrodite (achieved through controlled thermal processing) with the mechanical flexibility and electrode adhesion of organic polymers, resolving the contradiction between ionic conductivity and mechanical compliance
Solution Approach 2:
The patent applies controlled thermal processing at specific temperature ranges (50-150°C for polymerization, 150-250°C for argyrodite formation) to transform the physical and chemical parameters of the precursor materials. This controlled parameter change enables the formation of a composite structure where inorganic argyrodite particles are integrated into the polymer matrix, achieving both high ionic conductivity and mechanical compliance
2Reliability
If glass and ceramic solid-state conductors are processed into thin films to reduce bulk resistance, then ionic conductivity is improved, but mechanical brittleness causes processing difficulties and void formation
Solution Approach 1:
The patent employs a polymer-based electrolyte matrix that inherently provides flexibility and processability, enabling the formation of thin films (1-50 micrometers) without the mechanical brittleness issues of glass and ceramic conductors. The organic polymer framework allows for solution processing and conformal deposition while maintaining structural integrity
Solution Approach 2:
By creating a composite of inorganic argyrodite particles within an organic polymer matrix, the patent achieves a material that can be processed into dense thin films. The polymer matrix provides processability and flexibility during manufacturing, while the inorganic particles provide high ionic conductivity, eliminating the processing difficulties associated with pure glass and ceramic conductors
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 approach enables the production of solid-state batteries with high ionic conductivity and mechanical strength, facilitating the use of lithium metal anodes and preventing dendrite penetration, thus enhancing the scalability and efficiency of solid-state battery production.
Implementation Method 1
heating the film to thereby react argyrodite precursor compounds in the film to form argyrodite
Implementation Method 2
thermally annealing the film to crystallize the outer shell
Implementation Method 3
thermally annealing the film to crystallize the outer shell
Data Source
AI summary
Provided herein are composite materials that include an ionically conductive inorganic solid particulate phase and an organic polymer phase. The ionically conductive inorganic solid particular phase includes an alklai metal argyrodite.