As an important part of the lithium ion battery, the conductive agents, although occupy a small amount in the battery, they greatly affect the performance of the lithium ion battery. Besides, it plays a very important role on improving battery cycle performance, capacity development, rate performance, etc.
Like lithium ion battery electrode materials, conductive agents are constantly evolving. From the earliest carbon black materials, it is characterized by punctate conductive agents. It can also be called zero-dimensional conductive agents, which improve conductivity mainly by point contact between particles. Later, conductive carbon fibers and carbon nanotubes have been gradually developed, a type of conductive agent with a one-dimensional structure. Due to its fibrous structure, it increases the contact with the electrode material particles. What’s more, it greatly improves the conductivity of the electrode and reduces the resistance of the pole piece.
Recently, the hot graphene material has gradually become a new type of conductive material for lithium-ion batteries. Because graphene has a two-dimensional layered structure. And it has the following advantages:
- greatly increases the contact between electrode particles
- improves conductivity
- reduces theamount of conductive agent used
- improvethe energy density of the lithium ion battery is improved