Spherical C/LiMn1-XMXPO4 (M=Mg, Zn) cathode materials were successfully prepared by spray pyrolysis. An olivine structure was obtained by heating at 973 K under argon/hydrogen (5%) atmosphere. Citric acid was used as the carbon source. Scanning electron microscopy (SEM) showed that the materials had spherical morphology. The electrochemical properties of the cathode were also estimated by the rechargeable capacity and cycle performance. The first discharge capacity of C/LiMn1-XZnXPO4 (X = 0.1) was approximately 60 mAh/g　at 0.1 C.

Spherical C/LiMn 1-X M X PO 4 (M=Mg, Zn X=0, 0.01, 0.05, 0.10) precursor powders were successfully prepared by ultrasonic spray pyrolysis. The C/LiMn 1-X M X PO 4 were obtained by heating at 973 K for 3 hours under argon/hydrogen (5%) atmosphere. The crystal phases of all samples had an olivine structure with a Pmnb space group and the impurity phase peak was not observed. The average particle size was approximately 0.7 µm. The electrochemical properties of the C/LiMn 1-X M X PO 4 cathode were estimated by the rechargeable capacity and cycle performance. Electrochemical measurement revealed that the discharge capacity was improved by doping foreign metal such as Mg and Zn ion. The first discharge capacity of C/LiMn 1-X Zn X PO 4 (X = 0.1) cathode was approximately 60 mAh/g at 0.1 C. It was steady cycling characteristics.