When lithium battery cathode surface discharge, the lithium ions in the hole into the cathode active materials. If the current increase the polarization increases, the discharge is difficult, and the conductivity between the electronic is poor, the electrical conductivity of the active substance by itself is not sufficient, in order to ensure good charging and discharging performance of the electrode, a certain amount of conductive agent is usually added in the preparation of the electrode to collect the microcurrent between the active substances and the fluid.
As the conducting agent materials for lithium ion batteries, conventional conducting agents super-P, KS-6, conductive graphite, carbon nanotube, graphene, carbon fiber VGCF and so on are mainly used. These conducting agents have their own advantages and disadvantages.
At present lithium ion battery conductive agent or conventional conductive agent SP. Carbon black has better ionic and electronic conductivity, because carbon black has a larger specific surface area, so it is conducive to the adsorption of electrolytes and improve the ionic conductivity. In addition, 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.
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