Warped Laminated Structure for Crack-Resistant Solid-State Batteries
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Solution Overview
Problem
All-solid-state batteries with dense solid electrolyte layers face issues of internal stress and cracking due to electrode expansion and contraction, leading to increased internal resistance and deteriorated cycling characteristics.
Innovation Solution
The battery design incorporates a laminated body with a warp of a predetermined angle, specifically within the range of 0.5° to 5°, to manage stress from volume expansion and contraction, thereby improving cycling characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the solid electrolyte layer is made dense to improve safety and reduce leakage, then the battery safety is improved, but internal stress concentrates and cracks occur during charge and discharge
Solution Approach 1:
The patent applies local quality by creating a solid electrolyte layer with non-uniform density distribution. Specifically, the layer has a first region with lower density and a second region with higher density, allowing different zones to fulfill different functions: the lower density region accommodates volume changes and reduces stress concentration, while the higher density region provides sufficient ionic conductivity and safety
Solution Approach 2:
The patent changes the physical parameter of density within the solid electrolyte layer. By controlling the density to vary across different regions (而非 maintaining uniform high density), the patent achieves a balance between stress resistance and ionic conductivity, preventing crack formation while maintaining battery safety
2Reliability
If the solid electrolyte layer is made dense to improve ionic conductivity, then the internal resistance is reduced, but cycling characteristics deteriorate due to crack formation
Solution Approach 1:
The patent applies local quality by creating a solid electrolyte layer with non-uniform density distribution. Specifically, the layer has a first region with lower density and a second region with higher density, allowing different zones to fulfill different functions: the lower density region accommodates volume changes and reduces stress concentration, while the higher density region provides sufficient ionic conductivity and safety
Solution Approach 2:
The patent changes the physical parameter of density within the solid electrolyte layer. By controlling the density to vary across different regions (而非 maintaining uniform high density), the patent achieves a balance between stress resistance and ionic conductivity, preventing crack formation while maintaining battery safety
Data Source
AI summary
An all-solid-state secondary battery includes a laminated body in which a positive electrode layer and a negative electrode layer are laminated via a solid electrolyte layer, a first external terminal, and a second external terminal, the laminated body has a first side surface parallel to a laminating direction and a second side surface parallel to the laminating direction and perpendicular to the first side surface, the first external terminal and the second external terminal are connected to the first side surface, and the laminated body has a warp in the laminating direction satisfying Equations (1) and (2):0.5°≤((A1+A2)/2)≤5° (1)A1≤8.0° (2)here, A1 is a warp angle of the laminated body when seen from a side of the first side surface, and A2 is a warp angle of the laminated body when seen from a side of the second side surface.