Solid-State Battery Electrolyte Stack for Delamination Resistance
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Solution Overview
Problem
Existing all-solid-state batteries face issues with delamination due to residual stress between solid electrolyte layers with different compressive properties, leading to deteriorated power characteristics.
Innovation Solution
Incorporating an intermediate electrolyte layer with a solid electrolyte material having a lower Young's modulus than the adjacent layers to improve adhesion and prevent delamination, thereby enhancing power characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If solid electrolyte layers with different compressive properties are stacked, then the battery structure is formed, but residual stress causes delamination and deteriorates power characteristics
Solution Approach 1:
A second solid electrolyte layer is introduced as an intermediate layer between the first and third solid electrolyte layers. This intermediate layer has a Young's modulus lower than both adjacent layers, acting as a stress buffer that absorbs and distributes residual stresses, thereby preventing delamination and improving adhesion between the electrolyte layers.
Solution Approach 2:
The Young's modulus parameter of the solid electrolyte materials is strategically varied across the layers. The second layer is designed with a specifically lower Young's modulus compared to the first and third layers, creating a gradient structure that optimizes stress distribution and prevents harmful stress concentration at interfaces.
Data Source
AI summary
A battery includes a positive electrode, a first electrolyte layer, a second electrolyte layer, a third electrolyte layer, and a negative electrode, which are arranged in the order stated. The first electrolyte layer includes a first solid electrolyte material. The second electrolyte layer includes a second solid electrolyte material. The third electrolyte layer includes a third solid electrolyte material. The second solid electrolyte material has a Young's modulus that is less than a Young's modulus of the first solid electrolyte material and less than a Young's modulus of the third solid electrolyte material. The first solid electrolyte material and the third solid electrolyte material are materials different from each other.