Composite Electrode Particles for Stable Area Density and Rollability
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Solution Overview
Problem
Conventional electrode active materials for electrochemical devices face challenges in achieving stable area density and rollability, which affect the performance and high-temperature storage characteristics of electrochemical devices.
Innovation Solution
The use of composite particles with specific characteristics, including electrode active material particles with a number-based median diameter of 0.2-4.0 μm, a volume-based D50 of 20-250 μm, a D90/D10 ratio of 2-30, and a carbon atom proportion of 20-70 mass% at the surface, along with the inclusion of conductive materials and binders, enhances area density stability and rollability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional electrode active materials are used, then electrochemical device functionality is achieved, but area density stability and rollability are insufficient
Solution Approach 1:
The patent uses composite particles comprising electrode active material particles, conductive material, and binder in specific proportions. This composite structure allows simultaneous optimization of area density stability (through controlled particle size distribution and surface carbon content) and rollability (through conductive material network formation and binder distribution), resolving the contradiction between manufacturing precision and reliability
Solution Approach 2:
The patent specifies precise parameter ranges: primary particle median diameter of 0.2-4.0 μm, composite particle D50 of 20-250 μm, D90/D10 ratio of 2-30, and surface carbon content of 20-70 mass%. By controlling these parameters, the patent achieves both excellent area density stability and rollability, transforming the contradiction into a optimized parameter set
2Manufacturing precision
If electrode active material particles with specific size range are used, then area density stability is improved, but particle distribution uniformity becomes challenging
Solution Approach 1:
The patent applies local quality by specifying different particle size requirements for different aspects: primary particle median diameter of 0.2-4.0 μm for area density stability, while controlling the overall composite particle distribution (D50: 20-250 μm, D90/D10: 2-30) for uniform distribution. The surface carbon content of 20-70 mass% also provides local quality enhancement at particle surfaces
Solution Approach 2:
By creating composite particles that incorporate conductive material and binder with the electrode active material, the patent achieves uniform distribution of all components while maintaining the beneficial primary particle size characteristics. The composite structure ensures homogeneous mixing and consistent performance
Data Source
AI summary
Composite particles contain electrode active material particles, a conductive material, and a binder. The electrode active material particles have a number-based median diameter of primary particles of not less than 0.2 μm and not more than 4.0 μm. The composite particles have a D50 of not less than 20 μm and not more than 250 μm and a D90/D10 of not less than 2 and not more than 30 in a volume-based particle diameter distribution. The proportion constituted by carbon atoms at surfaces of the composite particles is not less than 20 mass % and not more than 70 mass %.