Conductive additives, as an important component of lithium-ion batteries, although small in composition, greatly affect the performance of lithium-ion batteries and play a very important role in improving their cycling performance, capacity utilization, and rate performance.

1、 The role of conductive additives

The main function of conductive additives is to improve conductivity to ensure good charge and discharge performance of the electrode. During plate making, a certain amount of conductive additives are usually added to the active materials, which have the effect of collecting microcurrents between them, reducing electrode contact resistance, and accelerating electron movement rate. In addition, conductive additives can improve the processability of electrode sheets, promote the infiltration of electrolyte into electrode sheets, effectively increase the migration rate of lithium ions in electrode materials, reduce polarization, and thus improve the charging and discharging efficiency of electrodes and the service life of lithium batteries.

2、 The Influence of Conductive Additive Content on Electrical Properties

The role of conductive agents in electrodes is to provide electron movement channels. The appropriate content of conductive agents is necessary to achieve high discharge capacity and good cycling performance. If the content is too low, there will be fewer conductive channels, which is not conducive to high ampere current charging and discharging; If the content of conductive additives is too high, the relative content of active substances decreases and the battery capacity decreases.

The presence of conductive additives can affect the distribution of electrolyte in the battery system. Due to the spatial limitations of lithium-ion batteries, the injection amount of electrolyte is limited and generally in a lean state. As the internal connection of the battery electrolyte system is the cathode plasma, the distribution of lithium-ion batteries has a crucial impact on the diffusion of liquid phase. When the content of conductive additives at one end of the electrode is too high, the electrolyte will accumulate at that electrode, and the lithium ion transmission process at the other electrode is slow, with high polarization and easy failure after repeated cycling, thereby affecting the overall performance of the battery.