Effect of heat treatment on structure and properties of cathode materials for V2O5 lithium-ion batteries

The layered vanadium pentoxide (V2O5) application has a good development potential in lithium-ion battery cathode materials. In this paper, vanadium chloride (VCl3), terephthalic acid, and ethanol were served as crude materials to produce precursors of vanadium-based metal organic frameworks by simple solvothermal method. Porous vanadium oxides were synthesized by heat treatment at different temperatures. The results show that the vanadium pentoxide cathode material has a better electrochemical charge and discharge performance and steady cycle by heat treatment of the precursor at 600 degrees C. The specific capacity of first discharge of the vanadium pentoxide cathode material obtained by heat treatment at 600 degrees C reached to 324 mAh/g, and when the current density is 50 mA/g, the capacity retention ratio is still 50.6% after 100 cycles. The capacity retention ratio was increased by 16.6% compared to the heat treatment temperature at 400 degrees C.