Simple synthesis and electrochemical performance of V6O13 cathode materials as lithium-ion batteries.

V₆O₁₃ is synthesized by hydrothermal and solvothermal, respectively. The methods are compared to seek a simpler method for V₆O₁₃ synthesis. The results show that the best reaction time of hydrothermal-V₆O₁₃ is 3.5 h and the phase is pure. Compare with the solvothermal, the hydrothermal-V₆O₁₃ has smaller structure unit of about 100-200 nm, and there are also many pores, which is conducive to the transportation and storage of lithium ions. The results of charge-discharge test show that the electrochemical performance of hydrothermal-V₆O₁₃ is better than solvothermal-V₆O₁₃. The initial discharge capacity of hydrothermal-V₆O₁₃ is 319.2 mAh/g, and the retention rate is 50.5% after 100 cycles, which are 39.9 mAh/g and 12.6% higher than solvothermal-V₆O₁₃, respectively. The results of CV and EIS also confirm that hydrothermal-V₆O₁₃ has better electrochemical performance as lithium-ion batteries. [ABSTRACT FROM AUTHOR]