Battery Electrode Composite Particles for Fragmentation-Resistant Conveyance
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Solution Overview
Problem
Conventional composite particles for secondary batteries undergo fragmentation during pneumatic conveyance, leading to reduced fluidity and productivity issues in the production of non-aqueous secondary batteries.
Innovation Solution
Composite particles with a particle diameter retention rate of 70% or more, containing an electrode active material, a water-soluble polymer, and a binder composition, which inhibit fragmentation and enhance fluidity during conveyance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional composite particles are used for secondary battery electrodes, then the electrode can be produced through powder forming, but the composite particles undergo fragmentation during pneumatic conveyance leading to reduced fluidity and productivity
Solution Approach 1:
The patent changes the physical and chemical parameters of the composite particles by controlling the binder composition (using polyvinylidene fluoride with 1-10 wt% relative to electrode active material) and water-soluble polymer content (0.1-5 wt%). This optimization of compositional parameters enhances particle strength to prevent fragmentation during pneumatic conveyance while maintaining productivity
Solution Approach 2:
The patent creates a composite particle structure combining electrode active material, binder composition, and water-soluble polymer in specific proportions. This composite material approach ensures the particles have sufficient mechanical strength to resist fragmentation during conveyance while maintaining the desired electrochemical properties
2Stability of the object's composition
If composite particles undergo fragmentation during pneumatic conveyance, then small particles are formed, but this reduces fluidity and causes forming defects such as variation of area density in the electrode mixed material layer
Solution Approach 1:
The patent applies preliminary anti-action by pre-strengthening the composite particles through optimized binder and polymer composition before they undergo pneumatic conveyance. This preventive measure counteracts the fragmenting forces that will be encountered during transport, ensuring particles arrive at the forming stage intact and maintaining uniform area density in the electrode layer
Data Source
AI summary
Composite particles for a non-aqueous secondary battery electrode contain an electrode active material, a water-soluble polymer, and a binder composition. A particle diameter retention rate of the composite particles expressed by a formula: particle diameter retention rate of composite particles=D50(A) diameter/D50(B) diameter×100 (%) is 70% or more, given that in dry cumulative particle diameter measurement by laser diffraction/scattering, a volume-based median diameter (D50) of the composite particles when dispersing air pressure during measurement is set as 0.25 MPa is taken to be a D50(A) diameter and a volume-based median diameter (D50) of the composite particles when dispersing air pressure during measurement is set as 0.00 MPa is taken to be a D50(B) diameter.