Solid-State Battery Electrolyte Support for Anti-Peeling Insulation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In existing solid-state batteries, the adhesion of protective and lashing members to the electrode body weakens due to differing thermal expansion coefficients, leading to a risk of short circuits during repeated charging and discharging.
Innovation Solution
The electrode body includes a solid electrolyte layer with a support of fibers that project from its end surface, and a protective member connected to these fibers, ensuring a larger contact area and improved adhesion, thereby inhibiting short circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a protective member made of a different material than the electrode body is used, then the protective member can provide electrical insulation and protection, but the adhesion between the protective member and electrode body weakens due to different thermal expansion coefficients
Solution Approach 1:
The patent introduces an intermediary layer between the protective member and the electrode body. This intermediary layer has a thermal expansion coefficient that is intermediate between the protective member and the electrode body, thereby reducing the thermal stress and improving adhesion while maintaining electrical insulation properties.
Solution Approach 2:
The protective member is designed as a composite material structure consisting of multiple layers with different material properties. The composite structure combines materials with different thermal expansion coefficients to match the electrode body's thermal characteristics while maintaining protective and insulating functions.
2Device complexity
If the protective member is directly attached to the electrode body, then the structure is simple, but peeling occurs during repeated charging and discharging due to thermal expansion mismatch
Solution Approach 1:
An intermediary layer is introduced between the protective member and the electrode body to act as a buffer against thermal expansion mismatch. This layer prevents direct attachment while eliminating peeling issues during repeated charging and discharging cycles.
Solution Approach 2:
The thermal expansion coefficient parameter is modified by introducing materials with intermediate thermal properties. This changes the thermal characteristics of the protective assembly to match the electrode body, preventing peeling during thermal cycling.
3Strength
If the contact area between the protective member and electrode body is increased, then adhesion is improved, but the manufacturing process becomes more complex
Solution Approach 1:
The intermediary layer is applied as a thin coating or laminate that automatically increases the contact area between the protective member and electrode body. This approach improves adhesion without requiring complex manufacturing processes, as the intermediary layer can be applied through standard coating or lamination techniques.
Data Source
AI summary
A solid-state battery of the present disclosure includes an electrode body, current collector tabs that are connected to the electrode body, and a protective member. The electrode body has a positive electrode current collector, a positive electrode active material layer, a solid electrolyte layer, a negative electrode active material layer, and a negative electrode current collector that are laminated along a lamination direction. The solid electrolyte layer has a support including a plurality of fibers that are different in material from the protective member. The support projects from an end surface of the solid electrolyte layer. The protective member is connected to the support and disposed at the end surface.