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Proceedings Paper

Improving the electrochemical performance of LiFePO4/C by doping magnesium trisilicate
Author(s): Weiqiang Chen; Shixi Zhao; Hao Ding; Baohua Li; Cewen Nan
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Paper Abstract

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 LiFe0.99Mg0.01P0.985Si0.015O4/C cathode materials exhibit higher capacity and rate capability than the unsubstituted LiFePO4/C cathode. For example, LiFe0.99Mg0.01P0.985Si0.015O4/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 LiFe0.99Mg0.01P0.985Si0.015O4/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.

Paper Details

Date Published: 12 April 2012
PDF: 6 pages
Proc. SPIE 8409, Third International Conference on Smart Materials and Nanotechnology in Engineering, 840908 (12 April 2012); doi: 10.1117/12.923317
Show Author Affiliations
Weiqiang Chen, Tsinghua Univ. (China)
Shixi Zhao, Tsinghua Univ. (China)
Hao Ding, Tsinghua Univ. (China)
Baohua Li, Tsinghua Univ. (China)
Cewen Nan, Tsinghua Univ. (China)

Published in SPIE Proceedings Vol. 8409:
Third International Conference on Smart Materials and Nanotechnology in Engineering
Jinsong Leng; Yoseph Bar-Cohen; In Lee; Jian Lu, Editor(s)

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