Characterization of Nasicon-type Li3Fe2-2xTixMnx(PO4)3/C cathode materials

Nasicon-type Li3Fe2-2xTixMnx(PO4)3 (x = 0-0.2) cathodes were synthesized by a solid-state reaction route. The prepared powders were mixed with acetylene carbon using planetary milling to optimize the electrochemical performance. The galvanostatic charge/discharge test and the cyclic voltammetry (CV)...

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Bibliographic Details
Published in:Journal of alloys and compounds 2009-02, Vol.469 (1-2), p.327-331
Main Authors: SUN, Jun-Kang, HUANG, Fu-Qiang, WANG, Yao-Ming, SHAN, Zhi-Chao, LIU, Zhan-Qiang, LIU, Min-Ling, XIA, Yu-Juan, LI, Kai-Qiang
Format: Article
Language:English
Subjects:
Chemistry
Electrochemistry
Electrodes: preparations and properties
Exact sciences and technology
General and physical chemistry
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Summary:Nasicon-type Li3Fe2-2xTixMnx(PO4)3 (x = 0-0.2) cathodes were synthesized by a solid-state reaction route. The prepared powders were mixed with acetylene carbon using planetary milling to optimize the electrochemical performance. The galvanostatic charge/discharge test and the cyclic voltammetry (CV) indicated that both Li3Fe2(PO4)3/C and Li3Fe1.8Ti0.1Mn0.1(PO4)3/C cathodes showed two reversible redox phenomena at 2.8 and 2.7 V for Fe3+/Fe2+ couple versus Li/Li+ upon discharge. The plateau potential of Ti4+/Ti3+ versus Li/Li+ at 2.5 V is not observed because of the low content of Ti and the disturbance of Fe3+/Fe2+. In contrast, the plateau potential of Mn3+/Mn2+ versus Li/Li+ at 3.5 V is observed. In addition, the Li3Fe1.8Ti0.1Mn0.1(PO4)3/C cathode possessed higher reversibility and better capacity retention (122.3 mAh g-1 at C/20 in the first cycle, approaching the theoretical capacity of 128 mAh g-1, and close to 90.8 mAh g-1 at C/2 in the 20th cycle) than that of Li3Fe2(PO4)3/C cathode.
ISSN:0925-8388
1873-4669
DOI:10.1016/j.jallcom.2008.01.109