Grooved Current Collector Electrodes for Lower Solid-State Resistance
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Solution Overview
Problem
Conventional solid-state batteries face increased ohmic resistance due to poor contact between current collectors and electrode materials, limiting their performance and energy storage capacity.
Innovation Solution
The introduction of a high surface area electrode structure, where grooves are formed in the current collector and filled with electrode material, enhancing the contact between the current collector and electrode material, thereby reducing ohmic resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional flat current collectors are used in solid-state batteries, then the battery structure is simple, but the contact between current collectors and electrode materials is poor resulting in increased ohmic resistance
Solution Approach 1:
The current collector surface is transformed from a flat two-dimensional structure to a three-dimensional structured surface with grooves, ridges, and valleys. This dimensional change increases the surface area and creates multiple contact points with the electrode material, significantly improving contact quality and reducing ohmic resistance while maintaining manufacturing feasibility through techniques like laser texturing or embossing
Solution Approach 2:
The current collector is designed with a structured surface containing grooves and void spaces that allow electrode material to penetrate and fill. This porous-like structure increases the effective contact area between the current collector and electrode material, enabling better electrical contact and ion transport pathways without requiring a completely porous current collector structure
2Reliability
If the contact between current collectors and electrode materials is increased by forming grooves, then ohmic resistance is reduced, but the manufacturing process becomes more complex
Solution Approach 1:
Traditional mechanical groove formation methods (such as machining or molding) are replaced with laser texturing or embossing techniques. These methods use energy fields (laser or pressure) instead of mechanical cutting tools, enabling precise groove formation with complex patterns without the need for complex mechanical tooling, thereby reducing manufacturing complexity while achieving the desired surface structure for low ohmic resistance
Solution Approach 2:
The groove dimensions, depth, spacing, and patterns are optimized as controllable parameters to achieve the desired contact quality and ohmic resistance. By adjusting these geometric parameters, the manufacturing process can be tuned for different performance requirements using standard laser or embossing equipment, maintaining ease of manufacture while achieving improved electrical contact
Data Source
AI summary
An electrode is provided that includes a current collector and an electrode material comprising an electrode active material. The current collector includes at least one groove formed in the current collector. The electrode material is provided within the at least one groove, and the at least one groove has a prescribed depth from a surface of the current collector. A battery is also provided that includes a cathode, an anode, and an electrolyte disposed between the cathode and the anode. At least one of the anode and the cathode includes a current collector and an electrode active material in which the electrode material is provided within at least one groove of the current collector, and the at least one groove has a prescribed depth from a surface of the current collector.