Carbon Nanotube Dispersion with Dual Dispersants for Stable Viscosity
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Solution Overview
Problem
Existing carbon nanotube dispersions face issues with high initial viscosity and significant changes in viscosity over time, leading to poor processability and storage stability, especially when used in electrode slurry compositions.
Innovation Solution
A carbon nanotube dispersion is formulated using a cellulose-based dispersant and a polymer dispersant containing hexafluoropropylene (HFP) as a repeating unit, with a weight ratio of 100:10 to 100:400, to achieve low initial viscosity and minimal viscosity change over time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a cellulose-based dispersant is applied as a sole dispersant, then the rate of change in viscosity over time is reduced, but the initial viscosity of the dispersion becomes high
Solution Approach 1:
The patent combines a cellulose-based dispersant with a polymer-based dispersant (HNBR) to create a synergistic dispersing system. This merging of two different dispersant types allows the dispersion to achieve both low initial viscosity (from HNBR) and stable viscosity over time (from cellulose-based dispersant), resolving the contradiction between processability and viscosity stability
Solution Approach 2:
The invention uses a composite dispersant system consisting of two distinct dispersant materials with different functional characteristics. The cellulose-based dispersant provides viscosity stability while the polymer-based dispersant controls initial viscosity, creating a composite effect that neither material could achieve alone
2Stability of the object's composition
If a polymer-based dispersant such as HNBR is applied together with a cellulose-based dispersant, then dispersibility is improved, but both the initial viscosity and the rate of change in viscosity over time increase
Solution Approach 1:
The patent carefully controls the weight ratio parameters of the two dispersants, specifying that the polymer-based dispersant content is 10-50 parts by weight per 100 parts by weight of cellulose-based dispersant. This parameter optimization ensures that the polymer dispersant provides sufficient dispersibility enhancement without excessively increasing the initial viscosity, thus balancing dispersibility improvement with maintainable processability
Data Source
AI summary
The present invention relates to a carbon nanotube dispersion and a preparation method thereof, wherein the carbon nanotube dispersion includes carbon nanotubes, a first dispersant which is a cellulose-based dispersant, a second dispersant containing hexafluoropropylene (HFP) as a repeating unit, and a solvent, and the carbon nanotube dispersion of the present invention has a low initial viscosity and a low viscosity change rate, and thus, is excellent in storage stability and processability.