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Enhanced electrochemical properties of LiFe1−x Mn x PO4/C composites synthesized from FePO4·2H2O nanocrystallites
- Source :
-
Journal of Power Sources . 9/15/2012, Vol. 214, p344-350. 7p. - Publication Year :
- 2012
-
Abstract
- Abstract: The high discharge potential of LiMnPO4, 4.1 V vs. Li/Li+, and its theoretical capacity of 170 mAh g−1 make it a promising candidate as a cathode material in lithium-ion batteries. But extremely low electronics conductivity, slow lithium diffusion kinetics, and the Jahn-Teller effect of Mn3+ limit the electrochemical performances of LiMnPO4. In this work, the pre-synthesized and defined FePO4·2H2O nanocrystallites are used as one of the raw materials to synthesize LiFe1−x Mn x PO4/C (x = 0.85, 0.75, 0.65) composites via solid-state reactions. The synthesized LiFe1−x Mn x PO4 samples show well-crystallized structures and have enhanced electrochemical properties. There exist two plateaus around 3.5 and 4.1 V on both of their charge and discharge curves. Among the samples, the Fe0.25Mn0.75PO4 one exhibits the longest high-voltage charge/discharge plateau at 4.10 V/4.05 V, and has an average discharge voltage of ∼3.78 V vs. Li/Li+ and a discharge capacity of ∼130 mAh g−1 at 0.05 C rate. For the Fe0.25Mn0.75PO4 sample, the noticeable improvement of its electrochemical performances is mainly attributed to iron substitution, the appropriate Mn/Fe ratio, and the well-ordered crystal structure forming by using FePO4·2H2O nanocrystallites as one of the raw materials. [Copyright &y& Elsevier]
Details
- Language :
- English
- ISSN :
- 03787753
- Volume :
- 214
- Database :
- Academic Search Index
- Journal :
- Journal of Power Sources
- Publication Type :
- Academic Journal
- Accession number :
- 77460671
- Full Text :
- https://doi.org/10.1016/j.jpowsour.2012.04.089