Dr. Shixi Zhao Profile

Dr. Shixi Zhao

at Tsinghua Univ Shenzhen International Graduate School

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Proceedings Article | 13 April 2012 Paper

Improving the electrochemical performance of LiFePO4/C by doping magnesium trisilicate

Weiqiang Chen, Shixi Zhao, Hao Ding, Baohua Li, Cewen Nan

Proceedings Volume 8409, 840908 (2012) https://doi.org/10.1117/12.923317

KEYWORDS: Doping, Magnesium, Ions, Lithium, Silicon, Particles, Carbon, Argon, Scanning electron microscopy, Diffusion

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This work studies the effect of doping with magnesium trisilicate for LiFePO₄/C cathode materials by a solid-state method. The samples were synthesized by two-step processing. Firstly, it was heated at 360 °C for 10 hours and then was calcined at 700°C for 10 hours. All the annealing processing was carried out in argon atmosphere. The phase structure, morphology and element distribution of prepared samples were characterized by XRD and scanning electron microscope and energy dispersive spectrometer. The results show that Mg²⁺and Si⁴⁺ co-doped LiFe_0.99Mg_0.01P_0.985Si_0.015O₄/C cathode materials exhibit higher capacity and rate capability than the unsubstituted LiFePO₄/C cathode. For example, LiFe_0.99Mg_0.01P_0.985Si_0.015O₄/C exhibit discharge capacity of 146 mAh·g^-1 compared to 140mAh·g^-1 for unsubstituted LiFePO₄/C at 0.5C. Especially, at 5C rate, the discharge capacity of LiFe_0.99Mg_0.01P_0.985Si_0.015O₄/C was remarkably exceeded that of unsubstituted LiFePO₄/C cathode materials. The better performances of the cathode were attributed to the increase of electronic conductivity and the improved migration of lithium ion.

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