Layered Lithium Battery Electrode for Uniform High Loading
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Solution Overview
Problem
Existing lithium batteries with high-capacity electrodes suffer from non-uniform distribution of constituents, leading to increased density near the electrode surface and deteriorated performance.
Innovation Solution
A method of manufacturing an electrode with a dry process that includes a thin-film current collector, a fibrillized binder, and an interlayer to improve the uniform distribution of components, reducing internal resistance and enhancing the binding force between the electrode active material layer and the current collector.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If high loading electrode is used to increase energy density, then energy density is improved, but distribution of constituents becomes non-uniform and density near electrode surface increases
Solution Approach 1:
The electrode structure is segmented into three distinct layers: a first electrode layer, a porous intermediate layer, and a second electrode layer. This segmentation allows each layer to have optimized properties - the intermediate layer specifically designed with porosity to improve constituent distribution uniformity while the outer layers provide high loading capacity, thus resolving the contradiction between energy density and distribution uniformity
Solution Approach 2:
The porous intermediate layer is introduced with specific local properties (porosity of 30-70%) between the electrode layers. This local quality change in the intermediate region addresses the distribution uniformity issue without compromising the high loading capacity of the overall electrode structure, enabling both high energy density and improved constituent distribution
2Quantity of substance
If high loading electrode with non-uniform distribution is used, then energy density is improved, but lithium battery performance deteriorates
Solution Approach 1:
The porous intermediate layer acts as a mediator between the first and second electrode layers. It facilitates uniform distribution of constituents and improves binding force between layers, ensuring stable lithium battery performance while maintaining high energy density through the high loading electrode structure
3Ease of manufacture
If conventional electrode manufacturing process is used, then manufacturing simplicity is maintained, but component distribution uniformity and binding force are insufficient
Solution Approach 1:
The porous intermediate layer is prepared in advance with controlled porosity (30-70%) and then laminated between the electrode layers. This preliminary preparation of the intermediate layer with optimized properties before final assembly enables improved component distribution and binding force while maintaining relatively simple manufacturing process
Data Source
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AI summary
An electrode, a lithium battery comprising the same, and a method of manufacturing the electrode are provided. The electrode includes: an electrode active material layer including an electrode active material and a binder; an electrode current collector disposed on one surface or between opposite surfaces of the electrode active material layer; and an interlayer disposed between the electrode active material layer and the electrode current collector, wherein, when the electrode active material layer is measured by a surface and interfacial cutting analysis system (SAICAS), the ratio of change in a vertical relative force (FVR) between a first point 5% away from the surface of the electrode active material layer facing away from the electrode current collector, and a second point 5% away from the surface of the electrode current collector, with respect to the total thickness of the electrode active material layer, is 300% or less.