Abstract
Electrochemically-active FePO4 was introduced for surface modification of spinel LiMn2O4 cathode material to improve the electrochemical performance. Optimal technique for the LiMn2O4/FePO4 composites was specified. With proper content of FePO4 and annealing temperature, significant improvement in capacity and cyclability was obtained at room temperature and 60 °C. As compared with the LiMn2O4 coated with other oxides such as Al2O3, SiO2 and ZrO2, the FePO4 incorporated LiMn2O4 shows both enhanced initial capacity and cyclability. Examined by impedance measurement, the FePO4 incorporation in LiMn2O4 significantly suppresses the increase of charge-transfer impedance.
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