High rate capability by sulfur-doping into LiFePO matrix.

Enhanced electrochemical performance of LiFePO for Li-ion batteries has been anticipated by anion doping at the O-site rather than cation doping at the Fe-site. We report on the electrochemical performance of S-doped LiFePO nanoparticles synthesized by a solvothermal method using thioacetamide as a sulfur source. S-doping into the LiFePO matrix expands the lattice due to the larger ionic radius of S than that of O.