Free-Standing Dry Electrode Film for Uniform High-Load Distribution
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Solution Overview
Problem
Lithium batteries with high load electrodes suffer from non-uniform distribution of constituents, leading to increased surface density and deteriorated performance, necessitating an electrode capable of preventing or reducing performance deterioration.
Innovation Solution
A dry electrode film with improved mechanical strength is developed, featuring a uniform dispersion of first and second electrode active materials with a specific particle diameter ratio, integrated into a lithium battery to enhance durability and cycle characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If high load electrode is used to increase energy density, then capacity increases, but constituent distribution becomes non-uniform and surface density increases leading to performance deterioration
Solution Approach 1:
The patent applies local quality by creating regions with different particle size compositions within the electrode. Specifically, smaller particles (d1) are distributed throughout the electrode structure, while larger particles (d2) are concentrated in certain regions, creating a non-uniform but optimized local composition that prevents aggregation and maintains performance in high-load electrodes
Solution Approach 2:
The patent employs asymmetry by establishing a specific size ratio relationship between two types of electrode active materials where d1/d2 is greater than 1 and less than 5. This asymmetric size distribution creates a hierarchical structure that improves packing efficiency and prevents the non-uniform aggregation that typically occurs in high-load electrodes
2Stability of the object's composition
If electrode active materials are dispersed to improve uniformity, then constituent distribution improves, but mechanical strength may be compromised
Solution Approach 1:
The patent uses composite materials by combining two different electrode active materials with specific size ratios (d1/d2 > 1 and < 5) along with a binder. This composite structure maintains uniform distribution while the specific size relationship and binder composition work together to preserve mechanical strength, resolving the trade-off between uniformity and strength
Data Source
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AI summary
A dry electrode film, an electrode including the same, and a lithium battery including the electrode, wherein the dry electrode film includes a dry electrode active material and a dry binder, wherein the dry electrode active material includes a first electrode active material and a second electrode active material, and a ratio (d1/d2) of a particle diameter of the first electrode active material (d1) to a particle diameter (d2) of the second electrode active material is greater than 1 and less than 5, and the dry electrode film is a free-standing film.