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Acetylene black plays a crucial role in lithium-ion batteries. Its unique chain-like structure facilitates the construction of an efficient conductive network within the electrode material, significantly improving conductivity. When added to the positive and negative electrode materials, it acts as an 'electronic bridge', accelerating electron movement and reducing internal resistance. For example, adding acetylene black to a lithium iron phosphate positive electrode significantly reduces internal resistance, improving power density and charge-discharge efficiency, allowing the battery to output electrical energy more efficiently during discharge.

Regarding the structural stability of the electrode material, the volume of the electrode material changes during the charge and discharge of the lithium-ion battery, especially for silicon-based negative electrodes. Acetylene black fills the gaps between electrode particles, acting as an 'elastic support' to buffer pressure and prevent the electrode material from fracturing and pulverizing due to excessive expansion, maintaining structural integrity. After multiple charge-discharge cycles, the electrode performance remains good, greatly extending the battery cycle life.

Acetylene black's high specific surface area is advantageous in increasing the contact area between the electrode and the electrolyte. It allows for more complete contact between the electrode material and the electrolyte. As the electrolyte serves as the lithium-ion transport medium, the larger contact area allows for smoother lithium-ion exchange between the electrode and the electrolyte. During charging, lithium ions can quickly enter the electrode, and during discharging, they quickly return to the electrolyte, significantly accelerating the charge and discharge speed. In short, acetylene black plays an irreplaceable role in improving the performance of lithium-ion batteries and is one of the key factors driving the development of lithium-ion battery technology.