Improved electrochemical performance of 2D accordion-like MnV2O6 nanosheets as anode materials for Li-ion batteries
MnV2O6 is a promising kind of anode material for lithium ion batteries with high theoretical specific capacity, abundant reserves and cheap constituent elements. However, in the process of lithization and de-lithization, MnV2O6 anode materials will form amorphous phase, leading to the collapse of its original layered structure, greatly reducing its lithium storage capacity and specific capacity, and affecting the long-term cycle performance. In this study, the 2D accordion-like MnV2O6 nanosheets with Co-doping are obtained via a hydrothermal route. The cobalt ions partially replace the position of manganese ions, and the emergence of Co3+ ions is inferred to induce the formation of built-in electric field in the electrode to enhance the electrochemical behaviors of MnV2O6, presenting a high capacity of 1005.9 mAh g-1 after hundreds of cycles. The capacitive contribution in the total capacity is investigated to put insight into the kinetic analysis of its electrochemical behaviors. This study sheds light on an effective strategy to obtain super electrochemical behaviors of MnV2O6-based materials and other transition metal oxides as electrodes for lithium storage.