Carbon Nanotube Dispersion for Conductive Battery Electrode Films
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Solution Overview
Problem
Current methods for dispersing carbon nanotubes in nonaqueous electrolyte secondary batteries face challenges in achieving high dispersibility, electrical conductivity, and adhesion, particularly with carbon nanotubes having small outer diameters and long fiber lengths.
Innovation Solution
A carbon nanotube dispersion liquid is developed, containing carbon nanotubes with an average outer diameter of 3-25 nm, a Brunauer-Emmett-Teller (BET) specific surface area of 150-800 m2/g, and an average fiber length of 0.8-3.5 μm, along with a dispersant and a solvent, to enhance dispersibility and electrical properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If carbon nanotubes with small outer diameter and long fiber length are used, then electrical conductivity and adhesion are improved, but dispersibility deteriorates
Solution Approach 1:
The patent optimizes specific parameters of carbon nanotubes including outer diameter (3-25 nm), fiber length (1-5 μm), and BET specific surface area (150-800 m2/g) to achieve the desired balance between conductivity and dispersibility. By precisely controlling these parameters, the invention resolves the contradiction between improved electrical properties and maintained dispersibility.
2Strength
If carbon nanotubes with small outer diameter and long fiber length are used, then adhesion is improved, but dispersibility deteriorates
Solution Approach 1:
The patent establishes specific parameter ranges for carbon nanotubes including outer diameter (3-25 nm), fiber length (1-5 μm), and BET specific surface area (150-800 m2/g) to simultaneously achieve high adhesion and good dispersibility. This parameter optimization resolves the contradiction between enhanced adhesion strength and maintained ease of dispersion.
3Quantity of substance
If carbon nanotubes are added to electrode materials, then charge-discharge capacity is improved, but electrode resistance increases
Solution Approach 1:
The patent optimizes carbon nanotube parameters including outer diameter (3-25 nm), fiber length (1-5 μm), and BET specific surface area (150-800 m2/g) to achieve high charge-discharge capacity while maintaining low electrode resistance. The controlled parameters enable both increased capacity and reduced resistance simultaneously.
Data Source
AI summary
A manufacturing method of a carbon nanotube dispersion liquid containing carbon nanotubes, a dispersant, and a solvent includes at least the following steps. A dispersion treatment is performed on the carbon nanotubes having a BET specific surface area (m2/g) of 220 to 800, 20 parts by mass to 100 parts by mass of the dispersant relative to 100 parts by mass of the carbon nanotube, and the solvent using a homogenizer or a paint conditioner. A fiber length of the carbon nanotubes in the carbon nanotube dispersion liquid obtained from the dispersion treatment ranges from 0.8 μm to 3.5 μm.