Cadmium/barium-activated lithium iron phosphate cathode material

The invention discloses a cadmium/barium-activated lithium iron phosphate cathode material, which has the chemical general formula of LiCdxBayFePO4, wherein x is equal to 0.00002 to 0.00005; y is equal to 0.0003 to 0.003; and the molar ratio of Li to Cd to Ba to Fe to P is 1:(0.00002-0.00005):(0.0003-0.003):1:1. Due to the doping of a small amount of substitutional magnesium/barium, control over the appearance and grain size of the product is facilitated, a stable lithium iron phosphate compound is obtained, the crystal lattice of the compound is activated and a lithium ion diffusion coefficient is increased. The first discharge capacity of a battery adopting the obtained material reaches 160.52mAh/g. The potential of a charging and discharging platform relative to a lithium electrode is about 3.5V, the initial discharge capacity of the battery exceeds 168mAh/g, and the capacity of the battery is attenuated by about 1.2 percent after 100 charging and discharging cycles. Compared with those of the control embodiment of undoped LiFePO4, specific capacity and cyclical stability are relatively more improved.