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Preparation and Characterization of Chlorine Doped Li3V2(PO4)3 as High Rate Cathode Active Material for Lithium Secondary Batteries
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- Authors
- S. N. Lee, H. S. Kim, J. Y. An, S. Amaresh, Y. G. Lee, K. W. Nam, Y. S. Lee
- Issue Date
- 2014-10
- Citation
- Journal of Nanoscience and Nanotechnology, v.14, no.10, pp.7516-7520
- ISSN
- 1533-4880
- Publisher
- American Scientific Publishers (ASP)
- Language
- English
- Type
- Journal Article
- Abstract
- Monoclinic Li3V2(PO4)2.99Cl0.01was synthesized using the conventional solid state method and the X-ray diffraction pattern was indexed based on P 21/n space group. The sharp cyclic voltammetric curves clearly revealed three lithium extraction/insertion processes at approximately 3.64, 3.72, 4.13, and 4.58 V during the anodic scan and 3.96, 3.58, and 3.48 V during the cathodic scan. Charge/discharge studies showed reduced electrolyte decomposition contribution in the case of the chlorine doped Li3V2(PO4)2.99Cl0.01sample with an initial capacity of 176 mA h g-1at a 0.1 C current rate. The chlorine doped Li3V2(PO4)3sample showed an increased capacity retention with an increase in current rate, even at a very high C-rate (20 C), than the pristine and carbon coated samples. The pristine and carbon coated Li3V2(PO4)3samples showed a lower capacity retention of 71% and 84%, respectively, at a current rate of 0.1 C. In contrast, the chlorine doped Li3V2(PO4)3sample retained 87% of the initial capacity (176 mA h g-1) at the same current rate but with a higher coulombic efficiency of 91%. The enhanced capacity retention for the chlorine doped Li3V2(PO4)3was attributed to the reduction in polarization and decreased charge transfer resistance of the electrode.
- KSP Keywords
- 48 V, Carbon coated, Charge/discharge studies, Coulombic Efficiency, Current rate, Cyclic voltammetric, Enhanced capacity, High C-rate, High-rate, Lithium extraction, Lithium secondary battery