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Synthesis of the LiFePO4/C core–shell nanocomposite using a nano-FePO4/polythiophene as an iron source

[Display omitted] ► A LiFePO4/C core-shell nanocomposite is synthesized from a nano-FePO4/PTh composite. ► The typical size of the FePO4/PTh is in the range of 20-50nm. ► The optimized LiFePO4/C shows a typical size of 50-100nm. ► The fully coated carbon layer observed by HRTEM is of 2-4 nm thicknes...

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Bibliographic Details
Published in:Journal of power sources 2012-01, Vol.197, p.253-259
Main Authors: Liu, Jing, Yang, Guiling, Zhang, Xianfa, Wang, Jiawei, Wang, Rongshun
Format: Article
Language:English
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Summary:[Display omitted] ► A LiFePO4/C core-shell nanocomposite is synthesized from a nano-FePO4/PTh composite. ► The typical size of the FePO4/PTh is in the range of 20-50nm. ► The optimized LiFePO4/C shows a typical size of 50-100nm. ► The fully coated carbon layer observed by HRTEM is of 2-4 nm thickness. ► The prepared LiFePO4/C core-shell nanocomposite shows a good rate performance. For the first time, a LiFePO4/C core–shell nanocomposite has been synthesized using a nano-FePO4/polythiophene (PTh) as an iron source. With this method, the PTh is in situ polymerized to restrain the growth of FePO4 particles, and the typical size of FePO4/PTh particles is in the range of 20–50nm. The optimized LiFePO4/C nanocomposite is synthesized at 750°C using 40% citric acid. The prepared LiFePO4 particles show a typical size of 50–100nm and they are fully coated by carbon of 2–4nm thickness. The LiFePO4/C core–shell nanocomposite gives an improved high electronic conductivity and a good electrochemical behavior at high rates. Thus, this novel method is an effective and facile strategy to improve the rate performance of the LiFePO4 cathode.
ISSN:0378-7753
1873-2755
DOI:10.1016/j.jpowsour.2011.09.028