Dual-Layer Electrode Design for Secondary Battery Conductivity
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional secondary battery electrodes face challenges in achieving optimal electrical conductivity and ionic conductivity due to inadequate electrolyte impregnation and porosity, leading to reduced battery performance.
Innovation Solution
The electrode design incorporates two layers with different active material diameters, where a layer with smaller particles is closer to the current collector to enhance density and conductivity, and a layer with larger particles farther away to increase porosity, improving electrolyte wetting and ionic conductivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single layer electrode structure is used, then the device complexity is reduced, but the electrical conductivity and ionic conductivity are insufficient
Solution Approach 1:
The electrode is divided into multiple layers with different active material particle sizes. The first layer contains smaller particles (1-10 μm) for high density and electrical conductivity near the current collector, while the second layer contains larger particles (10-30 μm) for high porosity and ionic conductivity away from the current collector. This segmentation allows each layer to optimize its function, resolving the contradiction between conductivity and structural simplicity.
Solution Approach 2:
Different regions of the electrode are assigned different properties: the region near the current collector (first layer) has small particles for high electrical conductivity and density, while the region away from the current collector (second layer) has large particles for high porosity and ionic conductivity. This local differentiation of material properties enables simultaneous optimization of electrical and ionic conductivity without requiring complex multi-component structures.
Data Source
AI summary
Disclosed are an electrode for secondary batteries including an electrode mixture coated on one surface or opposite surface of an electrode current collector, and a method of manufacturing the same. The electrode mixture includes an electrode mixture layer A, which is a portion close to a current collector, and an electrode mixture layer, which is a portion distant from a current collector. The electrode mixture layer A includes a mixture of two active materials, average diameters of which are different, and the electrode mixture layer B includes active materials, average diameters of which are the same.