Effect of Li excess content and Ti dopants on electrochemical properties of LiFePO4 prepared by thermal reduction method

Carbon coated Li1 + xFePO4 (x = 0, 0.01, 0.02, 0.03, 0.04) and doped compositions Li1.03Fe0.99Ti0.01PO4 have been synthesized by thermal reduction method in this paper. The results showed that increasing the content in Li1 + xFePO4 result in better electrochemical properties and cyclic performances until x = 0.03, which had similar change law with the particle size of samples; and the initial discharge capacity and cycle life of Li1.03Fe0.9Ti0.01PO4 was better than other samples under 1 C rate. When the Li1.03Fe0.99Ti0.01PO4/C sample cycled before 60 times, this sample exhibited a trend of increased capacity, and reached the highest discharging rate capacity of 156 mA h g−1 at 60 cycles. The electrochemical performances of LiFePO4 compositions synthesized by thermal reduction method, to some extent, can be improved by Li excess content and Ti doping.