Preparation and electrochemical performance of nitrogen-doped carbon-coated Bi2Mn4O10anode materials for lithium-ion batteries

To inhibit rapid capacity attenuation of Bi2Mn4O10anode material in high-energy lithium-ion batteries, a novel high-purity anode composite material Bi2Mn4O10/ECP-N (ECP-N: N-doped Ketjen black) was prepared via an uncomplicated ball milling method. The as-synthesized Bi2Mn4O10/ECP-N composite demonstrated a great reversible specific capacity of 576.2 mA·h/g after 100 cycles at 0.2Cwith a large capacity retention of 75%. However, the capacity retention of individual Bi2Mn4O10was only 27%. Even at 3C, a superior rate capacity of 236.1 mA·h/g was retained. Those remarkable electrochemical performances could give the credit to the introduction of ECP-N, which not only effectively improves the specific surface area to buffer volume expansion and enhances conductivity and wettability of composites but also accelerates the ion transfer and the reversible conversion reaction.