Acetylene carbon black plays an extremely important role in lithium-ion batteries. In terms of enhancing the conductive performance, its unique chain structure can construct an efficient conductive network within the electrode material. When added to the positive and negative electrode materials, it is like building an "electronic transmission bridge", accelerating the movement of electrons and reducing the internal resistance of the battery. For example, when acetylene carbon black is added to the lithium iron phosphate positive electrode, the internal resistance of the battery can be significantly reduced, the power density and charge-discharge efficiency can be improved, enabling the battery to output electrical energy more efficiently during discharging.

Regarding the structural stability of the electrode material, the volume of the electrode material changes during the charging and discharging of lithium-ion batteries, especially for the silicon-based negative electrode. Acetylene carbon black fills the gaps between the electrode particles, acting like an "elastic scaffold" to buffer the pressure, preventing the electrode material from cracking and pulverizing due to excessive expansion and maintaining the structural integrity. After multiple charge-discharge cycles, the performance of the electrode remains good, greatly extending the cycle life of the battery.

In increasing the contact area between the electrode and the electrolyte, the high specific surface area advantage of acetylene carbon black is fully demonstrated. It enables a more sufficient contact between the electrode material and the electrolyte. As the electrolyte is the medium for lithium ion transmission, a larger contact area makes the exchange of lithium ions between the electrode and the electrolyte more smooth. During charging, lithium ions can quickly enter the electrode, and during discharging, they can quickly return to the electrolyte, significantly increasing the charge-discharge speed. In conclusion, acetylene carbon black has an irreplaceable role in improving the performance of lithium-ion batteries and is one of the key factors in promoting the development of lithium-ion battery technology.