Morphology regulation and electrochemical properties of cathode material V6O13 for lithium-ion battery

A V6O13 micro-flower was synthesized via a facial hydrothermal method using ammonium metavanadate and oxalic acid dihydrate and combined with subsequent heat treatment. The effects of oxalic acid concentration and subsequent calcination temperature on the crystallinity and microstructure of V6O13 are discussed in detail. We have compared these data to determine the optimal amount of reducing agent and calcination temperature and futher explored the electrochemical properties of cathode materials. The results show that the concentration of oxalic acid and calcination temperature has a great influence on the morphology and crystallinity. When paired with Li anode, V6O13 cathode exhibits excellent electrochemical performance that the initial specific capacity is 376.7 mA g−1 and the capacity retention of 48.3% after 100 cycles at the current density of 100 mA g−1. This work provides some references for the development of high-performance lithium-ion battery cathodes.Graphic abstract