Striped Electrode Density Layout for Battery Cycle Stability
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Solution Overview
Problem
Existing electrodes for secondary batteries face challenges in improving electrolyte solution permeability, leading to uneven battery reactions and deterioration of performance over cycles.
Innovation Solution
The electrode design incorporates a mixture layer with alternating high and low density regions in a stripe pattern, enhancing electrolyte solution permeability and ensuring uniform impregnation across the electrode assembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If a mixture layer with high density is used to increase active material content, then battery capacity increases, but electrolyte solution permeability decreases leading to uneven impregnation
Solution Approach 1:
The mixture layer is designed with spatially varying density: high density regions contain a higher concentration of active material particles to increase capacity, while low density regions contain fewer particles to maintain porosity and electrolyte permeability. This local differentiation allows each region to fulfill its specific function optimally.
Solution Approach 2:
The mixture layer is segmented into multiple high density regions and low density regions arranged in a stripe pattern. This segmentation creates a heterogeneous structure that balances the competing requirements of high active material content and sufficient electrolyte penetration throughout the electrode.
2Reliability
If a mixture layer with low density is used to improve electrolyte solution permeability, then cycle characteristics improve, but battery capacity decreases
Solution Approach 1:
Low density regions are strategically positioned within the mixture layer to create channels for electrolyte penetration, ensuring reliable cycle characteristics. These regions are interspersed with high density regions that maintain overall active material content, so the capacity loss is minimized while permeability is improved.
Solution Approach 2:
The mixture layer is divided into alternating high and low density stripes, creating a periodic structure that facilitates electrolyte flow while maintaining sufficient active material. This segmented approach allows the electrode to achieve both good cycle life and acceptable capacity.
3Productivity
If a uniform density mixture layer is used to simplify manufacturing, then production efficiency increases, but battery performance deteriorates due to uneven reactions
Solution Approach 1:
The coating process applies slurry with varying solid content concentrations at different positions along the electrode width, creating local density variations. High solid content areas produce high density regions while low solid content areas produce low density regions, achieving the desired heterogeneous structure through a relatively simple continuous coating process.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This design improves cycle characteristics by ensuring even electrolyte distribution, thereby maintaining battery performance over multiple cycles.
Implementation Method 1
permeability of the electrolyte solution into the electrode assembly is conjectured to be improved, allowing the electrolyte solution to evenly impregnate into the entire electrode assembly
Data Source
AI summary
The purpose of the present disclosure is to improve the cycle characteristics of a secondary battery. An electrode for secondary batteries according to one example of the embodiments of the present disclosure is provided with a core body and a mixture layer that is formed on the surface of the core body. The mixture layer comprises a plurality of high-density regions and a plurality of low-density regions; and the high-density regions and the low-density regions are alternately arranged in a first direction of the mixture layer, while extending in a second direction that is perpendicular to the first direction, thereby forming stripes. It is preferable that there are three or more high-density regions and three or more low-density regions.