Composite Electrode Particles for Flexible Crack-Resistant Electrodes
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Solution Overview
Problem
Conventional composite particles used in electrochemical devices, such as lithium ion secondary batteries, face limitations in electrode flexibility, cracking resistance, cycle characteristics, and rate characteristics, necessitating improvements in the properties of the electrode active material and the electrochemical device as a whole.
Innovation Solution
The development of composite particles with specific ranges of average area-equivalent diameter, coefficient of variation of area-equivalent diameter, and coefficient of density, along with optimal binder properties, enhances the flexibility and inhibits cracking of the electrode active material, thereby improving the cycle and rate characteristics of the electrochemical device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional composite particles are used in electrode manufacturing, then the electrode can be formed with basic structural properties, but the electrode flexibility is insufficient and cracking occurs in the electrode active material
Solution Approach 1:
The patent applies parameter changes by precisely controlling the coefficient of variation of particle size distribution (5-50%) and the coefficient of density (1.3-3.5) of composite particles. This optimization of physical parameters improves electrode flexibility and prevents cracking while enhancing cycle and rate characteristics, resolving the contradiction between structural integrity and performance reliability.
Solution Approach 2:
The patent uses composite particles composed of electrode active material, conductive material, and binder in specific combinations. This composite structure improves both electrode flexibility (reducing cracking) and electrochemical performance (cycle and rate characteristics) simultaneously, addressing the contradiction between mechanical strength and reliability.
2Strength
If composite particles with specific size and density parameters are used, then electrode flexibility increases and cracking is inhibited, but manufacturing precision requirements increase
Solution Approach 1:
The patent defines specific ranges for coefficient of variation of particle size (5-50%) and coefficient of density (1.3-3.5) to achieve the desired balance between electrode flexibility and manufacturing feasibility. These parameter specifications provide clear manufacturing targets while ensuring improved electrode performance.
Data Source
AI summary
Composite particles contain an electrode active material, a conductive material, and a binder. These composite particles have an average value of area-equivalent diameter of not less than 20 μm and not more than 250 μm, a coefficient of variation of area-equivalent diameter, calculated according to formula 1: (standard deviation of area-equivalent diameter/average value of area-equivalent diameter)×100, of not less than 5% and not more than 50%, and a coefficient of density, calculated according to formula 2: compressed density/bulk density, of not less than 1.3 and not more than 3.5.