During the lithium‑ion battery production process, issues such as agglomeration of conductive agents in cathode slurry, uneven electrode coating, and poor separator wettability are core pain points affecting battery yield and cycling performance. With ultra‑low surface tension, excellent dispersibility and superior electrochemical compatibility, fluorocarbon surfactants serve as high‑efficiency special additives for cathode slurries of NCM ternary and lithium iron phosphate batteries.
They feature a simple and efficient core mechanism, with trace dosages significantly optimizing production processes. First, their outstanding wetting capability reduces slurry surface tension to 15‑25 mN/m, thoroughly resolving problems including poor spreadability of high‑solid‑content slurries, electrode pinholes and bubble shrinkage holes, and suiting wetting scenarios for electrodes and ceramic separator coatings. Second, they achieve efficient dispersion and stabilization. Through electrostatic repulsion and steric hindrance effects, they tackle the agglomeration of carbon nanotube and graphene conductive agents, greatly improving slurry uniformity and stability.
Meanwhile, these additives boast ultra‑high chemical stability. Their C‑F bond structure resists high and low temperatures as well as electrochemical corrosion, causing no side reactions or damage to the SEI film throughout the process, and is compatible with all systems of high‑voltage ternary and long‑cycle lithium iron phosphate batteries.
Practical formulas are tailored to two mainstream systems: 0.05%‑0.1% non‑ionic fluorocarbon surfactants are added to the oil‑based NCM system, and 0.03%‑0.08% compound fluorocarbon surfactants to the water‑based LFP system. This effectively increases electrode compacted density, lowers slurry viscosity, boosts battery cycle life by over 8%, and achieves a coating yield of 98%, making them core additives for quality improvement and cost reduction in lithium‑ion battery slurries.
