Electrochemical performance of LiCo_(1/3)Mn_(1/3)Ni_(1/3)O_2 hollow spheres as cathode material for lithium ion batteries

摘要

LiCo_(1/3)Mn_(1/3)Ni_(1/3)O_2 hollow spheres with an average outer diameter of 300 nm and a wall thickness of about 50 nm are prepared by using carbon spheres as template. They demonstrate excellent electrochemical performance, including high discharge capacity and rate capability. At a current rate of 0.2C (34 mAg~(-1), 0.34 mA cm~(-2)), cathode materials constituted by the hollow spheres display a discharge capacity of 175.4 mAhg~(-1). Even at a current rate of IOC (1700 mAg~(-1), 17mAcm~(-2)), the discharge capacity also keeps at 91.5 mAh g~(-1). The reasons lie in that the hollow structure has a large surface to contact with liquid electrolyte, resulting in a better electrochemical performance at high charge/ discharge rate.