Fast synthesis of core-shell LiCoPO4/C nanocomposite via microwave heating and its electrochemical Li intercalation performances

A very simple and rapid method for synthesizing LiCoPO₄/C nanocomposite has been developed via microwave heating. X-ray diffraction confirmed that nanosized olivine LiCoPO₄ was successfully synthesized. Scanning electron microscopy and transmission electron microscopy verified that LiCoPO₄ displays small powders with an average size of ～150 nm and is also coated with uniform amorphous carbon film of ～10 nm in thickness. Compared with pure LiCoPO₄, LiCoPO₄/C composite presented enhanced electrochemical Li-ion intercalation performances. Cyclic voltammetric and electrical tests disclosed that the Li-ion diffusion, the reversibility of lithium extraction/insertion and electrical conductivity were significantly improved in LiCoPO₄/C composite.