Carbon Nanotube Dispersion Liquid for Uniform Battery Electrode Mixing
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Solution Overview
Problem
Carbon nanotubes experience strong aggregation due to van der Waals forces, making it difficult to disperse uniformly in water and maintain dispersion stability, which is necessary for effective use in battery electrodes.
Innovation Solution
A carbon nanotube dispersion liquid comprising carbon nanotubes, carboxymethyl cellulose and/or its salt, water, and a compound represented by general formula (1), which improves dispersibility and stability by disassembling carbon nanotube bundles and maintaining the dispersed state.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If carbon nanotubes are used as conductive agents in battery electrodes, then electrical conductivity is improved, but uniform dispersion in water becomes difficult due to strong aggregation from van der Waals forces
Solution Approach 1:
The patent introduces a dispersing agent as an intermediary substance between carbon nanotubes and water. This dispersing agent adsorbs onto the carbon nanotube surface, providing steric or electrostatic repulsion that counteracts the van der Waals attraction, thereby enabling uniform dispersion while maintaining the conductive properties of the carbon nanotubes in battery electrodes
Solution Approach 2:
The patent creates a composite system consisting of carbon nanotubes combined with a dispersing agent formulation. This composite approach allows the carbon nanotubes to maintain their intrinsic conductive properties while the dispersing agent component provides the necessary stabilization, achieving both high conductivity and uniform dispersion stability
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution enhances carbon nanotube dispersibility and stability, leading to improved cycle characteristics in batteries, particularly in non-aqueous electrolyte secondary batteries.
Implementation Method 1
Carbon nanotubes experience strong aggregation due to van der Waals forces
Implementation Method 2
improves carbon nanotube dispersibility and dispersion stability by disassembling the bundle
Data Source
AI summary
Carbon nanotube dispersibility and dispersion stability are improved. A carbon nanotube dispersion liquid according to an embodiment includes a carbon nanotube; carboxymethyl cellulose and/or a salt thereof; water; and a compound represented by general formula (1) below. In formula (1), R1 represents a hydrogen atom, a methyl group, or an ethyl group, R2 represents a hydrogen atom, a methyl group, or a hydrocarbon group that forms a 5-membered heterocyclic ring or a 6-membered heterocyclic ring together with an -N-C(=O)-N-R3-, R3 represents a hydrogen atom, a methyl group, or a hydrocarbon group that forms a 5-membered heterocyclic ring or a 6-membered heterocyclic ring together with an -N-C(=O)-N-R2-, and R4 represents a methyl group or an ethyl group. R1 and R2 are not simultaneously hydrogen atoms. The number of carbon atoms in the compound is 4 or greater.