Conductive Nanocarbon Paste

Conductive Nanocarbon Paste is a key material for electronic component packaging, electrodes and interconnects. Conductive agents have their own characteristics and forms. Most lithium-ion battery manufacturers will mix and match conductive agents according to the form, particle size, specific surface area and conductivity of the conductive agents....

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Conductive Nanocarbon Paste is a key material for electronic component packaging, electrodes and interconnects. Conductive agents have their own characteristics and forms. Most lithium-ion battery manufacturers will mix and match conductive agents according to the form, particle size, specific surface area and conductivity of the conductive agents.

The conductive agents widely used in lithium batteries can be divided into three categories: conductive carbon black, conductive graphite and new conductive agents. New conductive agents mainly refer to carbon nanotubes and graphene.

Compared with traditional conductive agents, new conductive agents such as carbon nanotubes and graphene have certain advantages.

Carbon nanotubes

(1) Carbon nanotubes have good electronic conductivity, and the fibrous structure can form a continuous conductive network in the electrode active material;

(2) After adding carbon nanotubes, the electrode sheet has higher toughness, which can improve the peeling caused by the volume change of the material during charging and discharging, and improve the cycle life;

(3) Carbon nanotubes can greatly improve the penetration of electrolyte in the electrode material;

(4) The main disadvantage of carbon nanotubes is that they are not easy to disperse.

Graphene

The effect of a conductive agent is closely related to its addition amount. When the addition amount is small, graphene can form a better conductive network, and its effect is much better than that of conductive carbon black.

Carbon nanotubes vs. graphene, which one is better?

On the one hand, from the perspective of the conductive mechanism, graphene conducts electricity through point-to-surface contact, while carbon nanotubes conduct electricity through point-to-line contact. Generally speaking, the larger the contact area, the better the conductivity.

Conductive agents usually have to achieve the best conductivity with the least amount. From the perspective of conductive performance, graphene has better conductivity. However, carbon nanotubes have a stronger ability to absorb liquid in electrolytes.

On the other hand, there are bottlenecks in the development of both. At present, the industry unanimously believes that the production cost of real graphene is high and it is difficult to achieve industrialization; while the biggest problem of carbon nanotubes is dispersion. In comparison, the dispersion of carbon nanotubes is easier to overcome than the "difficult birth" of graphene. In addition, when the performance is not much different, price may be the issue that companies care more about. The reduction in cost is largely due to the improvement of technology. From this perspective, whoever has advanced technology and low cost will win the first opportunity in the lithium battery market.

TANFENG Technology is committed to the research and development, production, application development and sales of carbon nanotubes and graphene. Its commercial application areas include lithium batteries, conductive polymer composite materials, antistatic coatings, tire rubber reinforcement and other applications. The company has international patents for the preparation of multi-walled carbon nanotubes and single-walled carbon nanotubes, as well as professional technology for mass production of carbon nanotubes.

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