The carbon black conductive agent is to disperse carbon black uniformly in the solvent, and the carbon nanotube is to use carbon nanometer as the conductive agent to disperse in the solvent.
Conductive advantages of carbon nanotubes:
The conductivity of carbon nanotubes is related to its helicity, and the conductivity varies with the helicity. Carbon nanotubes can exhibit semiconductor and metallic properties. The conductivity and long diameter of carbon nanotubes determine its suitability as a conductive agent for lithium-ion electrode materials. The electrical conductivity and the length of the long diameter make it easier to form a conductive grid. good effect can be achieved.
Conductive advantages of conductive carbon black:
Conductive carbon black can be divided into conductive carbon black, superconductive carbon black and special conductive carbon black according to the strength of conductivity. Generally, the oil absorption value is used to indicate the structure of carbon black. The larger the structure, the easier it is to form a conductive grid path that is difficult to destroy. The higher the structure degree of carbon black with fine particle size, the tighter the network chain formed between the particles, and the easier it is to form a conductive structure. At present, the conductive carbon black is mainly conductive agent SP and acetylene carbon black.
Conductive carbon black sp has high specific surface area, high structure, and high purity, and can be used in positive and negative electrodes. Adding an appropriate amount can effectively improve the battery cycle capacity and service life, and has no effect on the electrochemical mechanism.
Acetylene carbon black has better liquid absorption, which helps to improve cycle life.
Generally, the addition amount of conductive carbon black is 1%-3% of the positive and negative electrodes, while the addition amount of carbon nanotubes is 1.5%. At present, new conductive agents such as carbon nanotubes urgently need to reduce costs compared with traditional conductive agents such as carbon black to meet the demand. At present, most manufacturers are willing to choose carbon black as a conductive agent. In addition to the excellent electrical conductivity of carbon black itself, the low price is also the reason for its choice.