Composite Active Material with Si Microparticles for Coating Crack Resistance
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Solution Overview
Problem
The formation of a coating layer on active materials in batteries is prone to cracking and peeling when subjected to shear forces during mixing with other materials, which can lead to poor performance and output characteristics.
Innovation Solution
A composite active material is developed with a coating layer containing microparticles of smaller diameter than the active material, which are coated with Si, allowing for point contact and reduced shear force, thereby preventing cracking and peeling of the coating layer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a coating layer is formed on the active material surface, then the reaction between active material and electrolyte material is restrained, but the coating layer is prone to cracking and peeling when subjected to shear forces during mixing
Solution Approach 1:
The invention introduces microparticles with Si content specifically at the coating layer surface, creating local compositional differentiation. This local quality enhancement at the surface provides targeted reinforcement where shear forces act during mixing, while the bulk coating layer maintains its protective function against electrolyte material.
Solution Approach 2:
The coating layer is designed as a composite structure containing microparticles dispersed within the coating matrix. This composite architecture combines the protective properties of the base coating material with the mechanical reinforcement provided by Si-containing microparticles, achieving both surface protection and crack resistance.
2Strength
If microparticles are added to the coating layer, then cracking and peeling are restrained during kneading, but the device complexity increases
Solution Approach 1:
The invention specifies particular parameter ranges for the microparticles, including particle diameter (0.1-10 μm) and Si content (1-50 wt%), to achieve optimal reinforcement效果. By controlling these parameters within defined ranges, the coating layer gains enhanced strength without requiring overly complex structural designs.
Data Source
AI summary
The problem of the present invention is to provide a composite active material, which may restrain cracking and peeling of a coating layer, when the composite active material having an active material and the coating layer for coating the surface thereof is kneaded. The present invention solves the above-mentioned problem by providing a composite active material including an active material and a coating layer for coating the surface of the above-mentioned active material, in which microparticles are disposed on the surface thereof, characterized in that the above-mentioned microparticles have a smaller particle diameter than the particle diameter of the active material, and contain Si.