有色设备

With LiH₂PO₄ and Mn powder as raw material, PVA as carbon source, uniform distribution and high reactivity precursor of [Mn₃(PO4)₂·_xH₂O+Li₃PO₄] was prepared by mechanical liquid activation precipitation method. Then carbon coating LiMnPO₄ material was obtained after roasting of as-prepared precursor. LiMnPO₄/C has poor rate capability and cycling performance. Therefore, Mn-site substitution Li(Mn_0.95Fe_0.05)_1-xM_xPO₄/C（M=Cr³⁺,V⁵⁺,Ti⁴⁺） was conducted by doping different valency ions. Among these alternatives, Li(Mn_0.95Fe_0.05)_0.99Ti_0.01PO₄/C with Ti doping exhibits the highest discharge rate capacity of 134mAh·g^-1 (0.05C). Under the optimization conditions, Li(Mn_0.95Fe_0.05)_0.96Ti_0.01Mg_0.03PO₄/C displays discharge rate capacity of 141 and 108mAh·g^-1, at 0.1C and 1C, respectively. At 2C, the cycle discharge rate capacity is maintained well, with 74mAh·g^-1 after 40 times cycling, which demonstrates the good rate performance and cycle stability.