All Solid Battery Interface Roughness for Peeling Prevention
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Solution Overview
Problem
All solid batteries with thin oxide-based solid electrolyte layers face reliability issues due to peeling at interfaces between layers, which degrades cycle characteristics and increases the risk of short circuits, despite efforts to flatten the electrolyte layer for enhanced capacity.
Innovation Solution
A multilayer all solid battery structure is designed with specific interface roughness adjustments between the solid electrolyte and electrode layers, using conductive materials for collector layers and active materials for electrodes, to enhance adhesion and prevent peeling, while maintaining a thin electrolyte layer for improved capacity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the solid electrolyte layer is made thin to secure battery capacity, then the energy density is improved, but the reliability deteriorates due to peeling at interfaces and short circuit risks
Solution Approach 1:
The patent applies different roughness characteristics to different interfaces: the interface between the solid electrolyte layer and electrode layers is kept smooth, while the interface between the electric collector layer and electrode layers is made rough. This local differentiation of surface quality prevents peeling at the critical solid electrolyte interface while maintaining adhesion at the collector interface, resolving the contradiction between thin electrolyte layer and reliability.
2Manufacturing precision
If the solid electrolyte layer is flattened to reduce thickness variation, then the manufacturing precision is improved, but the adhesion at interfaces deteriorates due to material differences causing peeling
Solution Approach 1:
The patent differentiates interface roughness by location: smooth interfaces where the solid electrolyte contacts electrode layers, and rough interfaces where the electric collector contacts electrode layers. This local quality control allows the solid electrolyte layer to be flattened for manufacturing precision while preventing peeling through strategic roughness at the collector interface.
Solution Approach 2:
The patent changes the surface roughness parameter at specific interfaces to prevent peeling. By controlling the roughness of the electric collector-electrode interface to be larger than the solid electrolyte-electrode interface, the patent compensates for the material differences between metal/carbon collectors and ceramic electrodes, maintaining adhesion strength despite flattening the solid electrolyte layer.
Data Source
AI summary
An all solid battery includes a solid electrolyte layer, a first electrode structure that has a structure in which a first electric collector layer of which a main component is a conductive material is sandwiched by two first electrode layers including an active material, and a second electrode structure that has a structure in which a second electric collector layer of which a main component is a conductive material is sandwiched by two second electrode layers including an active material. Roughness of interfaces between the first electric collector layer and the two first electrode layers and/or roughness of interfaces between the second electric collector layer and the two second electrode layers is larger than roughness of interfaces between the solid electrolyte layer, and the first electrode layer and the second electrode layer sandwiching the solid electrolyte layer.