Solid-State Battery Current Collector Layout Against Plating Penetration
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Solution Overview
Problem
All-solid-state batteries face issues with plating solution penetration during the production process, leading to faults and reduced non-defective item rates due to the lower baking temperature of copper paste and potential void formation in the copper layer.
Innovation Solution
The battery design includes a laminated structure with current collector layers having a thinner extension part at the end surface compared to the main body part, with specific thickness and length ratios to minimize plating solution penetration, and the extension parts are shifted from the center to reduce exposure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a standard thickness current collector layer is used throughout, then electrical conductivity is maintained, but plating solution penetrates through voids in the copper layer causing faults
Solution Approach 1:
The current collector layer is designed with different thicknesses in different regions: a first thickness in the main body and a second, smaller thickness at the extension part. This local variation in thickness provides different levels of protection against plating solution penetration where needed while maintaining electrical conductivity in other areas.
Solution Approach 2:
The solution addresses the penetration problem by modifying the thickness dimension of the current collector layer rather than changing its material composition or adding separate barrier layers. The thickness varies from the first thickness in the main body to the second thickness at the extension part, creating a dimensional gradient that prevents plating solution penetration.
2Loss of substance
If copper paste baking temperature is reduced to prevent lithium volatilization, then lithium loss is prevented, but voids form in the copper layer increasing penetration risk
Solution Approach 1:
The current collector layer has different thickness specifications for different regions. The extension part has a smaller thickness (second thickness) compared to the main body (first thickness), which compensates for potential void formation in specific areas while maintaining overall structural integrity and preventing plating solution penetration.
3Object-affected harmful factors
If aperture pattern design is used to prevent plating solution penetration, then penetration is reduced, but manufacturing complexity increases due to additional process steps
Solution Approach 1:
Instead of changing the aperture pattern or adding complex structural features, the solution changes the thickness parameter of the current collector layer. The layer transitions from a first thickness in the main body to a second, smaller thickness at the extension part, providing penetration protection through a simple parameter variation rather than complex structural modifications.
Data Source
AI summary
An all-solid-state battery with which the occurrence of faults due to plating solution penetration can be further reduced and a non-defective item rate can be improved. An all-solid-state battery includes a laminated body in which electrode layers in which a current collector layer and active material layers are laminated with solid electrolyte layers containing a solid electrolyte there between. The electrode layer includes the current collector layer and the active material layers including an active material layer. The current collector layer includes a main body part formed inside the laminated body and an extension part that extends from an end surface from the main body part to an end surface of the laminated body. Then, the thickness (Te) of the extension part on the end surface of the laminated body is smaller than the thickness (Tb) of the main body part.