Electrode Plate Particle Sizing to Limit Composite Layer Resistance
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Solution Overview
Problem
The use of small-sized magnesia filler particles in electrode plate slurries can lead to increased electric resistance due to their potential entry into the composite layer, affecting the performance of energy storage devices.
Innovation Solution
An electrode plate configuration with a composite layer and a covering layer, where the active material particles have a particle size ratio of 0.2 or more compared to the filler particles, preventing filler particle entry into the composite layer and maintaining electrolyte permeability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If small-sized filler particles are used in the slurry, then the covering layer can be formed more effectively, but the filler particles may enter the composite layer and increase electric resistance
Solution Approach 1:
The patent applies parameter changes by establishing a specific particle size ratio relationship between active material particles and filler particles. The D30 value of active material particles is set to be 0.05 to 0.95 times the D50 value of filler particles, optimizing the size parameters to prevent filler particle penetration while maintaining covering layer effectiveness.
Solution Approach 2:
The patent implements preliminary action by controlling the particle size distribution before slurry application. By pre-establishing the appropriate size relationship between active material and filler particles, the patent prevents the harmful effect of filler particle entry into the composite layer before it occurs during the coating process.
2Reliability
If filler particles enter the composite layer, then the covering layer formation is enhanced, but the electric resistance value of the composite layer increases
Solution Approach 1:
The patent changes the critical parameter of particle size ratio to resolve the contradiction. By setting the D30 of active material particles to be within 0.05 to 0.95 times the D50 of filler particles, the patent achieves optimal balance between covering layer formation quality and prevention of filler particle penetration that would increase resistance.
Solution Approach 2:
The patent uses the size distribution characteristics of active material particles as a reference template to select appropriate filler particle sizes. This copying approach ensures that filler particles are neither too small (which would cause penetration) nor too large (which would compromise covering effectiveness).
Data Source
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AI summary
In an electrode having a covering layer stacked on a composite layer, an increase in resistance of the electrode is suppressed. An electrode plate includes a composite layer including active material particles and a covering layer including filler particles stacked on the composite layer. In this electrode plate, a particle size (D30) of the active material particle is set to be equal to or smaller than a particle size (D50) of the filler particle.