Lithium Electrode Particle Size Distribution for Energy Density
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Solution Overview
Problem
Current solid polymer electrolyte lithium batteries face challenges in achieving high active material loading and optimal spatial arrangement of electrode material particles, which affects energy density and porosity.
Innovation Solution
The development of an electrode material with a specific particle size distribution, characterized by a median size between 1.5µm and 3µm, a standard deviation ratio of 0.5 or greater, and a calculated ratio of (D90 / D10) / D50 ≥ 3.0, ensuring a broad distribution that allows for higher active material loading and reduced porosity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the ratio of active material to binder is increased to achieve higher active material loading, then the energy density is improved, but air or gas is trapped in the spacing between contacting electrode material particles, increasing porosity
Solution Approach 1:
The patent applies parameter changes by optimizing the particle size distribution of electrode materials with specific metrics (D10, D50, D90 values and their ratios) to improve packing density. This controlled parameter adjustment allows higher active material loading while minimizing trapped air through scientifically defined particle characteristics
2Quantity of substance
If cathode thickness is increased to achieve higher energy content, then the energy density is improved, but the high rate performance is deteriorated
Solution Approach 1:
The patent resolves this contradiction by changing the particle size distribution parameters of the electrode material. The optimized particle size range and distribution allow thicker electrodes to maintain both high energy content and good rate performance by improving electrolyte penetration and lithium ion diffusion pathways
3Reliability
If electrode porosity is increased to accommodate sufficient electrolyte penetration, then the ionic conduction is improved, but the active material loading is reduced
Solution Approach 1:
The patent applies parameter changes by defining specific particle size distribution characteristics (D10 ≥ 0.5μm, D50 ranging from 1.5μm to 3μm, D90 ≤ 10.0 μm, and (D90/D10)/D50 ≥ 3.0 μm-1). These parameter optimizations enable reduced porosity while maintaining sufficient ionic conduction through improved particle packing and electrolyte distribution
Data Source
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AI summary
An electrode and an electrode material for lithium electrochemical cells are disclosed. The electrode material is in powder form and has a particle size distribution wherein the measured particle size distribution of the electrode material has a median size D5o ranging from 1.5µm and 3µm, a D10 = 0.5µm, a D90 =10.0 µm, and a calculated ratio (D90 / D 10) / D50 = 3.0 which is indicative of a peak of the measured particle size distribution on the left of the median D50 which improves the loading and energy density of the electrode produced with this electrode material powder.