Positive and negative conductive agents for lithium batteries，Conductive carbon fiber VGCF

The conductive carbon fiber has a linear structure, and it is easy to form a good conductive network in the electrode, showing good conductivity, thus reducing the electrode polarization, reducing the internal resistance of the battery and improving the performance of the battery. Compared with the point to line contact between conductive carbon black and conductive graphite, it is not only beneficial to improve the electrode conductivity, but also can reduce the amount of conductive agent and improve the battery capacity. VGCF has few impurities and can be safely used as positive additive. If VGCF is added to the electrode (positive electrode and negative electrode), VGCF has a large aspect ratio. Even after the positive and negative active materials expand and contract, the gap between the active material particles can be bridged by VGCF, and the electron and ion transmission will not be interrupted, which can greatly improve the conductivity of the electrode. Due to the hollow microstructure of carbon nanofiber VGCF, the positive and negative electrodes can absorb more electrolyte, which makes the lithium ion can be embedded smoothly and quickly, which is conducive to high rate charge and discharge. VGCF is a high-strength fibrous material with large aspect ratio, which can increase the winding ability of the electrode plate. The adhesive force between the positive and negative active material particles is stronger, and the powder will not crack due to winding, which can improve the strength of the electrode. Because of the high conductivity and thermal conductivity, the conductivity of the positive active material is not good. Adding carbon nanofibers can improve the active conductivity of the positive electrode and the thermal conductivity of the positive and negative electrodes, which is conducive to heat dissipation. The above effects can greatly improve the characteristics (cycle characteristics, output characteristics, etc.) of Li ion battery. VGCF is the most suitable additive for automotive lithium-ion batteries with long life and high output.

SEM

Greatly improve the conductivity of the cell
Strengthen the strength and toughness of the pole piece
Obviously reduce the internal resistance

VGCF is added to improve the rate performance, and VGCF is added to the positive electrode to greatly increase the high current discharge capacity

The addition of VGCF can improve the liquid absorption performance of high pressure solid density electrode

VGCF is very effective to enhance the cycle life of the cell