An optimized Mn-doped LiFePO4/C Composite Synthesized by Carbonthermal Reduction Technique

作者：Lin, Ying; Lin, Yingbin; Zeng, Baozhi; Zhao, Guiying; Zhou, Ting; Chen, Meiling; Mao, Xiamei; Lai, Heng; Huang, Zhigao

来源：International Journal of Electrochemical Science, 2011, 6(12): 6653-6661.

• Lithium-ion battery
• LiFePO4/C
• Mn doping
• Cycle performance

Mn-doped LiFePO4/C cathode materials were synthesized by a carbothermal reduction technique using sucrose as both the reduction agent and the carbon source. The microstructure and electrochemical performance were systematically investigated by X-ray diffraction (XRD), scanning electron microscopy (SEM), Raman spectroscopy, charge-discharge cycling, cyclic voltammograms and electrochemical impedance spectroscopy. It is found that the all as-prepared composites have a single phase of orthorhombic olivine-type structure and Mn2+ has successfully introduced into the M-2(Fe) sites. Among the as-prepared comosites, LiFe0.98Mn0.02PO4/C demonstrates a best electrochemical property in terms of discharge capacity, electrochemical reversibility and cycling performance with an initial discharge capacity of 165 mAh.g(-1) at a discharge rate of 0.2C. The improved electrochemical performance should be attributed to the smaller particle, the enhancement of the P-O bond and the facilitation of Li+ ion "effective" diffusion induced by Mn2+-substitution.

• 出版日期2011-12
• 单位福建师范大学