Preparation and Characterization of LiFePO[sub 4] from a Novel Precursor of NH[sub 4]FePO[sub 4]⋅H[sub 2]O

The crystal structure of the electrochemical material, such as grain size and crystal lattice defects, influences its character directly. cathode material was obtained by solid-state reaction of the homogeneous mixture, , and sugar. The influences of the reaction temperature, content of carbon on the structure, and electrochemical performance of were investigated. The X-ray diffraction characterization, scanning electron microscopy, and electrochemical performance measurements were carefully studied. The relationship between grain size and the electrochemical performance is discussed. As a result, the cathode material with 5% carbon obtained by sintering at 600°C for has good electrochemical performance. Between 2.5 and vs Li, a reversible capacity is as high as at .