应用水热法在200 oC下合成了橄榄石结构LiFePO4正极材料，合成过程中添加蔗糖作为包覆用碳源，并同时掺Co. 实验表明，包覆碳掺Co能更有效地改善LiFePO4电极的电化学性能. 样品可后退火处理，400 oC 退火LiFePO4样品结晶度和颗粒尺寸均影响了其电化学性能，包覆碳掺CoLiFePO4样品可使颗粒细化，改善电极倍率性能.

Phospho-olivine LiFePO4 cathode materials were prepared by hydrothermal reaction at 200 oC. Sucrose was added as C-coating resource and Co was doped into the crystal lattice of LiFePO4. In order to investigate the improvements in the electrochemical properties of Co-doped LiFePO4, three samples, LiFePO4, C-coated LiFePO4 and C-coating-Co-doped LiFePO4, were synthesized under the same preparation conditions. Charge/discharge studies reveal that the Co-doped LiFePO4/C composite annealed at 400 oC exhibits marked improvement of specific capacity by diminishing the particle sizes and enhancement in the degree of crystallinity. The C-coating and Co-doped into the LiFePO4 crystal lattices improve the rate performance through the reduction of the particle sizes.