文摘
A rapid synthetic route to nanocrystalline carbon-incorporated mixed metal oxide nanocomposites with enhanced electrode performance for lithium ion batteries is developed by applying a very short heat-treatment of layered double hydroxide (LDH) precursor under C<sub>2sub>H<sub>2sub> flow. Employing C<sub>2sub>H<sub>2sub> atmosphere makes possible the rapid synthesis of nanocrystalline C–NiO–NiFe<sub>2sub>O<sub>4sub> nanocomposite via the calcination of the Ni–Fe–LDH precursor at 300 °C in a very short period of 5 min. In the case of ambient atmosphere, a prolonged calcination time of several hours is demanded to induce a complete phase transformation from Ni–Fe–LDH to electrochemically active NiO–NiFe<sub>2sub>O<sub>4sub> nanocomposite, highlighting the usefulness of C<sub>2sub>H<sub>2sub> atmosphere in promoting the formation of mixed metal oxide nanocomposite. The present C–NiO–NiFe<sub>2sub>O<sub>4sub> nanocomposite shows much better anode performance for lithium ion batteries with greater discharge capacity and better cyclability than do the NiO–NiFe<sub>2sub>O<sub>4sub> nanocomposites prepared by the prolonged calcination of LDH under ambient atmosphere. The superior electrode activity of the present C–NiO–NiFe<sub>2sub>O<sub>4sub> nanocomposite is attributable to the optimization of charge transfer induced by the enhanced electrical conductivity and a short diffusion length of Li ion. The present C<sub>2sub>H<sub>2sub>-assisted phase transition of LDH precursor provides a convenient, economic, and scalable synthetic way to carbon–mixed metal oxide nanocomposites with promising electrode performance for lithium ion batteries.