▎ 摘　　要

By annealing [Mn(phen)H2O][V2O6] (phen = 1,10-phenanthroline) in the presence of graphite template, MnV2O4 /C microparticles are obtained, in which MnV2O4 particles with one-layer or few-layer coating of graphene are anchored on the graphite sheets. The optimal sample, MnV2O4(p)/C-700 with a high carbon content (35.3 at. %) can deliver a large specific capacity of 410 mAh g(-1) at 0.1 A g(-1) with a high capacity retention of 94.3% over 1000 discharge/charge cycles at 20 A g(-1) as cathode in zinc-ion battery. Ex situ X-ray diffraction, scanning electron microscopy, energy-dispersive X-ray spectra, as well as elemental mappings and X-ray photoelectron spectroscopy of MnV2O4(p)/C-700 discern the partial phase transformation mechanism of MnV2O4 -> Zn-3(OH)(2)V2O7(H2O)(2) during discharge/charge process. It is because the rich oxygen defects of MnV2O4 can improve electrical conductivity, favor the electron transfer from V -> Mn/O, thus facilitate the binding of Zn2+, and the captured Zn2+ cannot be extracted, as evidenced by density functional theory calculations. Furthermore, it is found that O-deficiency can capture the water shell from the hydrated Zn2+, then the dehydrated Zn2+ is easy to insert into MnV2O4 with lower migration barrier of Zn2+ (0.84 eV), leading to the structural reversibility of MnV2O4 in cycling test.