LiFe 0.4 Mn 0.6-x Ni x PO 4 /C(x = 0, 0.05, 0.1, and 0.2) composite cathode materials for lithium ion batteries have been prepared by the co-precipitation method using oxalic acid as a precipitator. The structure and morphology of precursors and products have been investigated. Electrochemical tests demonstrate that LiFe 0.4 Mn 0.55 Ni 0.05 PO 4 can deliver a specific capacity of 142 mAh g -1 at 0.1 C, and retains 133 mAh g -1 after 60 cycles. The rate performance of LiFe 0.4 Mn 0.6 PO 4 is obviously improved by doping Ni. The capacity of LiFe 0.4 Mn 0.55 Ni 0.05 PO 4 at 2 C is 110 mAh g -1 .
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