Positive Electrode Plate With Uneven Interface for Lower Resistance
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Solution Overview
Problem
The existing positive electrode plates in non-aqueous electrolyte secondary batteries have high input-output resistance due to the uniform distribution of active materials, which limits the efficiency of charge and discharge processes.
Innovation Solution
A positive electrode plate design featuring a first active material layer with aggregated particles and a second active material layer with single particles, structured with depressions and protrusions to create an uneven interface, allowing for improved electrical contact and reduced resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If single particles are used in the active material layer, then electrical contact is improved, but resistance increases due to poor contact between particles
Solution Approach 1:
The patent combines single particles and aggregated particles in a layered structure. The first active material layer contains aggregated particles that provide low resistance pathways, while the second active material layer contains single particles that ensure good electrical contact. This merging of two different particle configurations resolves the contradiction between electrical contact quality and resistance.
Solution Approach 2:
The active material layer is designed as a composite structure with two distinct layers having different particle characteristics. The first layer uses aggregated particles (composite of multiple primary particles) and the second layer uses single particles, creating a composite material system that simultaneously achieves low resistance and good electrical contact.
2Object-affected harmful factors
If aggregated particles are used in the active material layer, then resistance is reduced, but electrical contact between particles deteriorates
Solution Approach 1:
The active material layer is segmented into two distinct layers with different functions. The first layer (closer to current collector) contains aggregated particles for low resistance, while the second layer (outer layer) contains single particles for electrical contact. This segmentation allows each layer to optimize its particle configuration for its specific function.
Solution Approach 2:
Different regions of the active material layer are assigned different particle characteristics. The inner region (first layer) has aggregated particles suited for resistance reduction, while the outer region (second layer) has single particles suited for electrical contact. This local differentiation resolves the contradiction by optimizing each region for its specific requirement.
Data Source
AI summary
The present disclosure relates to a positive electrode plate, in which a first active material layer has a depressed structure in which a plurality of depressions are formed on a side facing the second active material layer; a second active material layer has a protruded structure in which a plurality of protrusions are formed on a side facing the first active material layer; in a cross section in a thickness direction of the positive electrode active material layer, an interface at which the first active material layer and the second active material layer are in contact with each other has an uneven shape formed by a combination of the plurality of depressions and the plurality of protrusions; and a mass ratio of the second active material layer to the first active material layer in the positive electrode active material layer is from 1/9 to 3/7.