SWCNT dispersion

In commercial use, carbon nanotubes can be divided into single-walled carbon nanotubes and multi-walled carbon nanotubes according to the number of graphene layers. The advantages of single-walled carbon nanotubes are: Simple structure and stable chemical properties: During the formation of multi-walled carbon nanotubes, the layers between layers are easy to become trap centers and capture various defects, while single-walled carbon nanotubes have a simple structure, good uniformity, few defects, and stable chemical properties....

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Classification of carbon nanotubes: Single-walled carbon nanotube SWCNT dispersion has better performance

In commercial use, carbon nanotubes can be divided into single-walled carbon nanotubes and multi-walled carbon nanotubes according to the number of graphene layers. The advantages of single-walled carbon nanotubes are:

Simple structure and stable chemical properties: During the formation of multi-walled carbon nanotubes, the layers between layers are easy to become trap centers and capture various defects, while single-walled carbon nanotubes have a simple structure, good uniformity, few defects, and stable chemical properties.

Small addition amount and excellent conductivity: Due to the high length-diameter ratio of single-walled carbon nanotube SWCNT dispersion, it can form a three-dimensional conductive network at a very low addition amount. At the same time, single-walled carbon nanotubes have a layer of carbon atoms and can exhibit metal or semiconductor properties according to the spiral characteristics of the space. In addition, its strong carbon-carbon bond enables it to have a higher current carrying capacity, and the current density can be more than 1,000 times higher than that of metals such as copper.

Good elasticity and high mechanical properties: Single-walled carbon nanotubes have stronger flexibility and can bend, twist or kink better. Their elastic modulus and tensile strength are significantly better than those of multi-walled carbon nanotubes.

Good thermal conductivity: The thermal conductivity per unit mass of single-walled carbon nanotubes is higher than that of multi-walled carbon nanotubes, and both can withstand high temperatures above 750°C.

Diverse colors of finished products: Multi-walled carbon nanotubes improve mechanical properties and conductivity by increasing the amount of addition, which will affect the surface quality and color of the product, such as it can only produce black materials. Since the addition amount of single-walled carbon nanotubes is generally 0.01~0.1%, any color and transparent conductive materials can be produced.

Excellent safety performance: Under multi-week cycles at 45°C, the internal resistance growth of soft-pack batteries with single-walled CNTs is significantly lower than that of batteries with other conductive agents, indicating that the risk of battery fire is lower.

Improve the adhesion of pole pieces: The single-walled carbon nanotube SWCNT dispersion network connects the positive electrode material particles together, thereby improving the connection strength between the particles. This property is particularly important for silicon-based negative electrodes, which are prone to powderization and detachment.

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