Conductive Paste Viscosity Control via Polycyclic Aromatic Resin
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Solution Overview
Problem
The challenge is to develop a conductive paste for lithium-ion battery positive electrodes with easy-to-apply viscosity, even when using a small amount of dispersant, as excessive dispersants negatively impact battery performance.
Innovation Solution
The use of a dispersion resin containing a polycyclic aromatic hydrocarbon-containing monomer, such as naphthyl-containing polymerizable unsaturated monomers, in the conductive paste, which reduces viscosity effectively while maintaining performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a large amount of dispersant is added to reduce viscosity of conductive paste, then the paste becomes easier to apply, but battery performance (internal resistance and capacity) deteriorates
Solution Approach 1:
The invention changes the chemical structure parameters of the dispersant by introducing polycyclic aromatic hydrocarbon groups (naphthyl, anthracenyl, phenanthrenyl) into the polymer backbone. This structural modification enables the dispersant to achieve superior viscosity reduction performance at lower concentrations, resolving the contradiction between ease of application and battery performance by making the dispersant more effective per unit amount.
Solution Approach 2:
The invention creates a composite dispersant system combining polycyclic aromatic hydrocarbon-containing polymer chains with specific side chain structures. This composite molecular architecture synergistically enhances dispersibility and viscosity control, allowing effective paste formulation with reduced dispersant content compared to conventional linear polymer dispersants.
2Reliability
If a small amount of dispersant is used to maintain battery performance, then battery performance is preserved, but the viscosity of conductive paste increases making it difficult to apply
Solution Approach 1:
By modifying the dispersant's molecular parameters - specifically incorporating rigid polycyclic aromatic cores with flexible side chains - the invention achieves enhanced interaction with conductive carbon particles. This parameter optimization allows the dispersant to exert greater viscosity-reducing effect per unit concentration, enabling effective paste formulation with minimal dispersant content.
Data Source
AI summary
The present invention provides a conductive paste for positive electrodes of lithium-ion batteries and mixture paste for positive electrodes of lithium-ion batteries that have an easy-to-apply viscosity, even when a relatively small amount of a dispersant is incorporated. More specifically, the present invention provides a conductive paste for positive electrodes of lithium-ion batteries containing a dispersion resin (A), conductive carbon (B), and a solvent (C), the dispersion resin (A) being a copolymer of a monomer mixture comprising a polycyclic aromatic hydrocarbon-containing monomer (A-1) in an amount of 1 to 70 mass %, based on the total solids content.