The effect of etching environment (opened or closed) on the synthesis and electrochemical properties of V₂C MXene was studied. V₂C MXene samples were synthesized by selectively etching of V₂AlC at 90 ℃ in two different environments: opened environment (OE) in oil bath pans under atmosphere pressure and closed environment (CE) in hydrothermal reaction kettles under higher pressures. In OE, only NaF (sodium fluoride) + HCl (hydrochloric acid) etching solution can be used to synthesize highly pure V₂C MXene. However, in CE, both LiF (lithium fluoride) + HCl and NaF+HCl etchant can be used to prepare V₂C MXene. Moreover, the V₂C MXene samples made in CE had higher purity and better-layered structure than those made in OE. Although the purity of V₂C obtained by LiF+HCl is lower than that of V₂C obtained using NaF+HCl, it shows better electrochemical performance as anodes of lithium-ion batteries (LIBs). Therefore, etching in CE is a better method for preparing highly pure V₂C MXene, which provides a reference for expanding the synthesis methods of V₂C with better electrochemical properties.