Hydrothermal synthesis and performance of Co doped lithiated vanadium oxides as cathode material for lithium ion batteries

摘要

Co doped lithiated vanadium oxides LiV_(3-x)Co_xO_8 as promising cathode material for lithium ion batteries are prepared with a hydrothermal process. The crystalline phase are characterised by powder X-ray diffraction and the morphology are observed by scanning electron microscope. The electrochemical properties of synthesized samples are investigated by galvanostatic charge and discharge at a current density of 50 mA g~(-1). The electrochemical properties were greatly improved via Co doping. Among the doping modified material LiV_(3-x)Co_xO_8, the most excellent performance can be achieved when x=0.01 and 0.03, which keep a specific discharge capacity of about 146 mAh g~(-1) even after 40 cycles.