Battery Electrode Carbon Coating for Low-Resistance Adhesion
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Solution Overview
Problem
Existing battery electrodes face increased resistance, particularly at high temperatures, due to insufficient adhesion between the current collector and the active material layer.
Innovation Solution
A battery electrode structure with a carbon coating layer comprising carbon material and resin, where the surface roughness ratio Ra/RSm of the active material layer is within a specific range (0.10 to 1.70), enhancing contact points and adhesion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a carbon material layer with adhesive properties is added to improve adhesion between current collector and active material layer, then adhesion is improved, but resistance increases
Solution Approach 1:
The invention applies different functional properties to different parts of the electrode structure. The carbon coating layer has high adhesive quality for bonding, while the active material layer surface is engineered with specific roughness characteristics (Ra/RSm ratio of 0.05-2.0) to maintain low resistance. This local differentiation allows simultaneous optimization of adhesion and resistance without compromising either property.
Solution Approach 2:
The invention changes the surface roughness parameters of the active material layer by controlling the Ra/RSm ratio within a specific range (0.05-2.0). This parameter optimization enables the surface to maintain both good adhesion properties and low resistance characteristics, resolving the contradiction between strength and reliability.
2Strength
If the surface roughness of the active material layer is increased to enhance adhesion, then adhesion improves, but resistance increases
Solution Approach 1:
The invention optimizes the surface roughness parameters by controlling the Ra/RSm ratio within a specific range (0.05-2.0). This controlled parameter change ensures that the surface has sufficient roughness for adhesion while maintaining smooth enough characteristics to prevent resistance increase, thereby resolving the contradiction between strength and reliability.
Solution Approach 2:
The electrode structure combines the carbon coating layer with the active material layer having controlled surface roughness, creating a composite structure where each component contributes different properties. The carbon layer provides adhesive bonding while the controlled roughness surface maintains low resistance, achieving both strength and reliability simultaneously.
Data Source
AI summary
The present disclosure provides a battery electrode and a battery capable of reducing resistance. In the battery electrode of the present disclosure, a current collector layer, a carbon coating layer, and an active material layer are laminated in this order. The carbon coating layer comprises a carbon material and a resin. On the surface of the active material layer on the carbon coating layer side, the ratio Ra/RSm of the arithmetic average roughness Ra to the average length RSm is 0.10 or more and 1.70 or less. A battery 60 comprises the battery electrode 50 of the present disclosure.