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With the commercialization of lithium batteries becoming more and more widespread, the charging and discharging process of lithium batteries on the surface of the positive material is that when the battery discharges, the lithium ions in the hole enter the positive active material. If the current increases, the polarization increases, and the discharge is difficult, so the conductivity between electrons is poor. The conductivity of the active material alone is far from enough. In order to ensure that the electrode has good charging and discharging performance, A certain amount of conductive agent is usually added during the production of the electrode plate to collect the micro-current between the active substances and the current collector.

Overview of conductive agents

As conductive agent materials for lithium ion batteries, conventional conductive agents such as SUPER-P, KS-6, conductive graphite, carbon nanotubes, graphene and carbon fiber VGCF are mainly used. These conductive agents have their own advantages and disadvantages. Specifically:

1、SP

At present, the domestic lithium ion battery conductive agent is mainly the conventional conductive agent SP. Carbon black has better ionic and electronic conductivity. Because carbon black has a larger specific surface area, it is beneficial to the adsorption of electrolyte and improve ionic conductivity. In addition, the carbon particles agglomerate to form a branched chain structure, which can form a chain conductive structure with the active material, which is helpful to improve the electronic conductivity of the material.

2. Graphite conductive agent

Graphite conductive agents include KS-6, KS-15, SFG-6 and SFG-15. It is basically artificial graphite. Compared with the negative electrode material artificial graphite, the artificial graphite as a conductive agent has a smaller particle size, which is conducive to the compaction of electrode particles and the improvement of ionic and electronic conductivity.

3. CNT conductive agent

The application proportion in high-end digital battery field is more than 50%, and the application proportion in power battery field is relatively low. However, in recent years, with the increasing requirements of power battery on energy density, rate performance, cycle life and other performance, the application proportion of CNT conductive agent in this field is gradually increasing.

4. Carbon black conductive agent

Carbon black conductive agents include: Corqin black, acetylene black, SuperP, SuperS, 350G, carbon fiber (VGCF), carbon nanotubes (CNTs), etc.

Koqin black: Koqin black can achieve high conductivity with only a very low amount of addition, so Koqin black has always been one of the conductive carbon black, and has been in the leading position in the market for a long time. Compared with other conductive carbon black used in batteries, Kochin black has a unique branched chain shape. The advantage of this form is that there are many conductive contact points of the conductive body, and the branch chain forms many conductive channels, so only a small amount of addition is required to achieve high conductivity (other carbon black is mostly spherical or flake, so a high amount of addition is required to achieve the required electrical properties). Corqin black is a relatively cutting-edge super conductive carbon black. At present, the top 10 lithium batteries are basically in use or test. EC-300J is mainly used for nickel hydrogen and nickel cadmium batteries; ECP and ECP-600JD are mainly used for lithium batteries with high magnification, large capacity and current density, especially the realization of ECP-600JD. It is generally believed in the industry that its superior conductivity, high purity and unique branched chain structure will emerge in the era of lithium iron as cathode material.

Acetylene Black: carbon black obtained by continuous pyrolysis of acetylene with a purity of more than 99%, which is obtained by decomposition and refining of by-product gas during pyrolysis of calcium carbide or naphtha (crude gasoline).

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