In order to improve the rate capability, the Mg-substituted LiFePO4 prepared by solid-state reaction was studied. Influence of Mg substitution on structure and electrochemical performances of LiMgxFe1-xPO4 material were investigated by means of DSC?XRD and charge-discharge tests. The doping of Mg could not only increase the capacity but also hold down the polarization in cycling processes. The lattice volume decreased when the Mg content increased, which made Li ionic conductivity reduce. When x was 10%, th...