Composite Particles for Electrode Thickness Uniformity
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Solution Overview
Problem
Existing methods for forming active material layers in electrochemical device electrodes using composite particles struggle to achieve precision and uniformity in thickness at high speeds during roll press forming, leading to difficulties in maintaining productivity and quality.
Innovation Solution
The development of composite particles with a specific ratio of secondary to primary particles (ρ2/ρ1 between 0.03 and 0.60, combined with a binder and conductive material, allows for the formation of an active material layer with enhanced precision and uniformity in thickness during roll press forming, utilizing a spray drying method to control particle size and distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the speed of formation is raised during roll press forming, then productivity is improved, but the precision of thickness and uniformity of the active material layer deteriorates
Solution Approach 1:
The invention changes the physical parameters of the composite particles by controlling the ratio of secondary agglomeration (ρ2/ρ1) within 0.03 to 0.60, and adjusting particle size distribution. This parameter optimization enables the particles to flow and pack uniformly during high-speed roll press forming, maintaining thickness precision even at increased formation speeds.
Solution Approach 2:
The invention performs preliminary granulation and classification of composite particles before the roll press forming process. By pre-forming particles with controlled secondary agglomeration ratios and size distributions, the material is prepared in advance to ensure uniform flow and packing during high-speed forming, thereby maintaining thickness precision at higher productivity rates.
2Productivity
If the speed of formation is raised during roll press forming, then productivity is improved, but the uniformity of thickness deteriorates
Solution Approach 1:
The invention optimizes the particle size distribution parameters by controlling the ratio of secondary agglomeration (ρ2/ρ1) within 0.03 to 0.60. This parameter control ensures that particles maintain consistent packing behavior during high-speed roll press forming, achieving uniform thickness across the electrode even at increased formation speeds.
Solution Approach 2:
The invention performs preliminary granulation to create composite particles with controlled secondary agglomeration before the actual forming process. This pre-prepared particle structure ensures uniform flow characteristics and packing density during high-speed roll press forming, maintaining thickness uniformity while improving productivity.
3Manufacturing precision
If composite particles with controlled secondary agglomeration are used, then thickness precision and uniformity are improved, but particle size distribution control becomes more complex
Solution Approach 1:
The invention replaces complex mechanical classification systems with a chemical approach using binders and controlled secondary agglomeration. By utilizing binder-mediated particle aggregation with controlled ρ2/ρ1 ratios, the invention achieves precise particle size distribution without requiring complex mechanical sorting equipment, thereby maintaining thickness precision while reducing overall system complexity.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach enables the production of electrochemical device electrodes with superior thickness precision and uniformity, even at high forming speeds, reducing the dependence on the supply rate of composite particles and improving overall productivity.
Implementation Method 1
spray drying method to control particle size and distribution
Data Source
AI summary
Composite particles for an electrochemical device electrode containing an electrode active material, a conductive material, and a binder, wherein primary particles of the composite particles have a volume average particle size of 1 to 500 μm and, when a relative particle amount of the primary particles having a particle size of a fine range near a mode radius R1 of the primary particles in the particle size distribution of the primary particles of the composite particles found by the volume standard is ρ1 and a relative particle amount of secondary particles having a particle size of the fine range in the particle size distribution of the secondary particles of the composite particles found by the volume standard in measurement at 23° C. is ρ2, ρ2/ρ1 is 0.03 to 0.60.