The synthesis of LiMnxFe1-xPO4/C cathode material through solvothermal jointed with solid-state reaction

Abstract

Abstract: LiMnxFe1-xPO4/C material has been synthesized through a facile solid-state reaction under the condition of carbon coating, using solvothermal-prepared LiMnPO4 and LiFePO4 as precursors and sucrose as a carbon resource. XRD and element distribution analysis reveal completed solid-state reaction of precursors. LiMnxFe1-xPO4/C composites inherit the morphology of precursors after heat treatment without obvious agglomeration and size increase. LiMnxFe1-xPO4 solid solution forms at low temperature around 350 °C, and Mn2+/Fe2+ diffuse completely within 1 h at 650 °C. The LiMnxFe1-xPO4/C (x < 0.8) composite exhibits a high-discharge capacity of over 120 mAhg-1 (500 Whkg-1) at low C-rates. This paves a way to synthesize the crystal-optimized LiMnxFe1-xPO4/C materials for high performance Li-ion batteries.