One-pot mechanical synthesis of the nanocomposite granule of LiCoO2 nanoparticles

摘要

The layered rock-salt LiCoO2 granules consisted of the primary nanoparticles were successfully synthesized by one-pot mechanical method without external heating. The sizes of the primary nanoparticle and the granule observed using electron microscopy were 50-200 nm and 20 μm, respectively. The surface property of the primary nanoparticle was evaluated by STEM-EELS, which revealed that the primary particle possesses the lithium defective part at the surface. The penetration behavior of an electrolyte into the granule was also evaluated by STEM-EDX, which indicated that the electrolyte could not fully penetrate into the granule. The first charge and discharge capacities of Li-ion cell assembled with the synthesized LiCoO2 granules were 140 and 120 mA h/g, respectively. The relationship between the particle structures of the synthesized LiCoO2 granules and the electrochemical properties were discussed.