Solid-State Electrolyte Layer with Carbon Gradient Against Brittleness
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Solution Overview
Problem
All-solid state batteries formed by the coating process face challenges with the solid state electrolyte layer becoming hard and brittle due to pressurization, leading to a higher risk of short circuits and reduced reliability.
Innovation Solution
Incorporating a carbon unevenly distributed layer within the solid state electrolyte layer, where the concentration of carbon atoms is higher than in the rest of the layer, to enhance the strength and resilience of the electrolyte without inhibiting ionic conductivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the solid state electrolyte layer is pressurized to improve contact and reduce voids, then the electrical connection between electrodes is improved, but the electrolyte layer becomes hard and brittle increasing short circuit risk
Solution Approach 1:
The patent applies local quality by creating a carbon unevenly distributed layer specifically at the interface between the solid state electrolyte layer and electrodes, rather than uniformly distributing carbon throughout the electrolyte. This localized carbon enrichment provides flexibility and collapse resistance precisely where mechanical stress occurs during pressurization, while maintaining the electrochemical properties of the bulk electrolyte.
Solution Approach 2:
The patent employs composite materials by combining carbon-containing material with the solid state electrolyte to form a composite structure. The carbon component provides mechanical flexibility and collapse resistance, while the solid state electrolyte maintains ionic conductivity. This composite approach resolves the contradiction between mechanical strength and electrochemical functionality.
Data Source
AI summary
A battery according to the present disclosure includes a first electrode, a second electrode, and a solid state electrolyte layer disposed between the first electrode and the second electrode, the solid state electrolyte layer containing at least a solid state electrolyte and at least carbon atoms and including a carbon unevenly distributed layer. The concentration of the carbon atoms in the carbon unevenly distributed layer is higher than the concentration of the carbon atoms in a region of the solid state electrolyte layer excluding the carbon unevenly distributed layer.