Patterned Coating Layer for Lithium Battery Negative Electrode Adhesion
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Solution Overview
Problem
Rechargeable lithium batteries face challenges in achieving excellent cycle-life characteristics and low resistance, particularly in the design of the negative electrode, where existing solutions often compromise between adhesion and electrical conductivity.
Innovation Solution
A negative electrode design featuring a current collector, a negative active material layer, and a coating layer with an organic metal-based material in a pattern shape, which enhances adhesion between the current collector and the active material layer while maintaining electrical conductivity by allowing direct contact between the active material and the collector.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a coating layer is applied between the current collector and the negative active material layer to enhance adhesion, then adherence is improved, but electrical conductivity deteriorates
Solution Approach 1:
The coating layer is applied in a patterned manner rather than uniformly across the entire current collector surface. This creates regions with different properties: patterned areas provide adhesion enhancement while non-patterned areas maintain direct electrical contact between the active material layer and current collector, thus resolving the contradiction between adherence and electrical conductivity
Solution Approach 2:
The coating layer is divided into discrete patterned regions rather than forming a continuous film. This segmentation allows selective application of the coating material only where adhesion is needed, while leaving other areas open for direct electrical contact, thereby balancing adhesion enhancement with conductivity maintenance
Data Source
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AI summary
A negative electrode for a rechargeable lithium battery and a rechargeable lithium battery including the same are provided. The negative electrode includes a current collector, a negative active material layer including a negative active material, and a coating layer between the current collector and the negative active material layer, the coating layer including an organic metal-based material, and a pattern shape.