Lithium Battery Electrode With Through-Holes for Uniformity and Flexibility
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Solution Overview
Problem
Lithium batteries with high loading electrodes often experience non-uniform distribution of constituents, leading to increased surface density and deteriorated performance, particularly in flexibility and high-rate capability.
Innovation Solution
Incorporating through-holes in the electrode active material layer, which extends to an interlayer between the active material and the current collector, enhances uniformity and flexibility, reducing local side reactions and internal resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If high loading is used in the electrode to increase energy density, then the capacity and energy density are improved, but the distribution of constituents becomes non-uniform and surface density increases, leading to deteriorated battery performance
Solution Approach 1:
The electrode active material layer is designed with a porous structure containing multiple through-holes that extend from one surface to the other. This porous architecture allows for uniform distribution of electrolyte and active material throughout the electrode, preventing localized density accumulation while maintaining high loading capacity. The through-holes create channels that facilitate even constituent distribution without compromising the overall energy density.
2Quantity of substance
If high loading is used in the electrode to increase energy density, then the capacity and energy density are improved, but the flexibility of the lithium battery deteriorates
Solution Approach 1:
The porous structure with through-holes provides internal void space that accommodates volume changes during charge-discharge cycles, reducing mechanical stress and improving flexibility. The through-holes act as stress relief channels, allowing the electrode to maintain its structural integrity and flexibility even with high loading amounts of active material.
3Quantity of substance
If high loading is used in the electrode to increase energy density, then the capacity and energy density are improved, but the high-rate capability and cycle characteristics deteriorate due to increased internal resistance
Solution Approach 1:
The porous structure with through-holes creates multiple pathways for ion transport, significantly reducing internal resistance. The through-holes provide direct channels for electrolyte flow and ion diffusion, enabling efficient mass transport even at high loading amounts. This results in improved high-rate capability and enhanced cycle characteristics by maintaining low resistance throughout the electrode structure.
Data Source
Figure 1A~1B
Figure 2A~2B
Figure 3A~3B
AI summary
An electrode, a lithium secondary battery including the same, and a method of preparing the electrode are provided. The electrode includes an electrode active material layer including an electrode active material and a binder, and having a plurality of through-holes; an electrode current collector on one surface of the electrode active material layer or between two surfaces of the electrode active material layer; and an interlayer between the electrode active material layer and the electrode current collector, wherein the electrode active material layer is a self-standing film and the plurality of through-holes included in the electrode active material layer extend to the interlayer.