Asymmetric Electrode Sheet with Distinct Particle Size Distributions
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Solution Overview
Problem
Current electrode sheets in batteries face challenges in achieving optimal electrical performance due to limitations in charge-and-discharge characteristics, rate capability, and cycle life, primarily attributed to the uniformity and distribution of active material particles across the current collector surfaces.
Innovation Solution
The electrode sheet design incorporates two active material layers with distinct particle size distributions and compositions on opposite surfaces of a current collector, optimizing the distribution to enhance ion migration paths and dispersion, thereby improving charge-and-discharge characteristics and cycle life.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If uniform active material distribution is used on both surfaces, then manufacturing simplicity is maintained, but electrical performance and rate capability are limited
Solution Approach 1:
The patent applies local quality by using different particle size distributions on different surfaces of the current collector. The first surface has a first particle size distribution while the second surface has a second particle size distribution, allowing each surface to be optimized for its specific functional requirements rather than using a uniform distribution throughout.
Solution Approach 2:
The patent segments the active material distribution into distinct regions with different characteristics. By dividing the electrode into two surfaces with different particle size distributions, the design allows independent optimization of charge and discharge characteristics, rate capability, and cycle life for each surface.
2Quantity of substance
If larger particle sizes are used, then energy density is improved, but ion migration and rate capability deteriorate
Solution Approach 1:
The patent optimizes different regions for different functions by applying local quality. One surface uses larger particle sizes to maximize energy density and active material capacity, while the other surface uses smaller particle sizes to enhance ion migration speed and rate capability, allowing both requirements to be satisfied simultaneously in different locations.
Data Source
AI summary
An electrode sheet and an electrode sheet assembly are provided. The electrode sheet includes a current collector, a first active material layer, and a second active material layer. The current collector has a first surface and a second surface opposite to the first surface. The first active material layer covers at least a part of the first surface. The second active material layer covers at least a part of the second surface. The first active material layer is different from the second active material layer. The first active material layer and the second active material layer have different particle size distributions.