Influence of Li:Fe molar ratio on the performance of the LiFePO4/C prepared by high temperature ball milling method

LiFePO4/C cathode material for lithium ion battery was prepared with lithium dihydrogen phosphate, iron oxide, and glucose monohydrate as raw materials. In an attempt to improve the electrochemical performance, the influence of Li:Fe molar ratio was investigated in this paper. Experimental results showed that the best electrochemical performance of LiFePO4/C was reached in this study, when Li:Fe molar ratio was 1.03:1 synthesized preheated ball milling temperature at 300 °C for 1 h, and then ball milling temperature at 650 °C for 8 h, at the rates of 0.1, 0.5, 1.0, 2.0, 5.0 and 10 C, the initial discharge capacities of 157 (± 2), 151 (± 2), 144 (± 2), 136 (± 2), 119 (± 2), 102 (± 2) mAhg− 1, respectively. Moreover, after 50 cycles, at rate of 0.1 C, the capacity of LiFePO4/C sample was 155 (± 2) mAhg− 1, and its capacity retention rate achieve 99.5%.