Conductive carbon coating layer applied to lithium iron phosphate cathode active material to enhance electrical conductivity and electrochemical performance in lithium-ion batteries.
The Carbon Coating Layer is a critical functional component in lithium iron phosphate (LiFePO4) cathode active material production, consisting of a thin, uniform layer of conductive carbon (typically amorphous carbon, graphite, or carbon black) deposited on the surface of LiFePO4 particles. This coating serves as an electronic conductor network, compensating for the intrinsically low electronic conductivity of LiFePO4, while maintaining ionic conductivity for lithium ions. It improves charge transfer kinetics, reduces polarization, enhances rate capability, and increases cycling stability by preventing direct contact between active material and electrolyte, minimizing side reactions.
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LiFePO4 has low intrinsic electronic conductivity (~10^-9 S/cm). Carbon coating provides a conductive pathway for electrons, enabling efficient charge/discharge cycles and improving rate capability.
Sucrose, citric acid, glucose, and polymers like PVA or PVP are commonly pyrolyzed to form amorphous carbon coatings during high-temperature processing.
It stabilizes the electrode-electrolyte interface, reduces side reactions, and maintains structural integrity during cycling, thereby extending battery life.
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