Hierarchical structure constructed by manganese oxalate framework with accurate iron doping for ultra-efficient lithium storage

ABSTRACT Transition-metal oxalates (TMOs) have demonstrated great potentials as the promising anode material for lithium ion batteries. Herein, a hierarchical structure was designed and constructed using manganese oxalate framework with accurate iron doping strategy. Owing to the synergistic effect from mixed metal oxalates and staggered conductive network from porous sheet morphology, the Mn0.8Fe0.2C2O4 with optimal Fe doping presents ultra-efficient lithium storage ability. For example, The as-prepared Mn0.8Fe0.2C2O4 electrode delivers an initial discharge capacity of 2275 mAh∙g−1, and the reversible capacity around 1903/2018 mAh∙g−1 after 100/200 cycles at 100 mA∙g−1, respectively. Besides, it also demonstrates excellent rate performance, and a high discharge capacity of 1045 mAh∙g−1 after 500 cycles at 500 mA∙g−1. The improved electrochemical performance is superior to previously reported for metal oxalates. Therefore these strategies about the hierarchical synthesis of different morphologies of MnxFe1-xC2O4 can display a huge application prospect in the industrialization of lithium ion battery anodes.