Carbon coated NASICON type Li3V2-xMx(PO4)3 (M=Mn, Fe and Al) materials with enhanced cyclability for Li-Ion batteries
Son, J. N.
Kim, G. J.
Kim, M. C.
Kim, S. H.
Lee, Y. G.
Lee, Y. S.
Date of Issue2013
Energy Research Institute
We report the synthesis and optimization of metal (Mn, Fe and Al) doped NASICON type Li3V2(PO4)3 by solid-state reaction method. Among the metal doping, 0.02 mol concentration of Al is found better performing electrode while approaching the removal of three moles of lithium between 3-4.8 V vs. Li. Adipic acid with various concentrations is used to generate in-situ carbon layer over the 0.02 mol Al doped Li3V2(PO4)3 particulates (Li3V1.98Al0.02(PO4)3). Presence of carbon on the surface of particulates is confirmed by TEM and Raman analysis. Half-cell Li/C-Li3V1.98Al0.02(PO4)3 (0.15 mol of adipic acid) exhibited the highest reversible capacity of ∼182 mAh g−1 (2.77 moles of lithium) at a current density of 0.1 mA cm−2 compared to rest of the adipic acid concentrations. Further, the cell retained 83% of capacity after 50 galvanostatic charge-discharge cycles at ambient conditions. Li-insertion/extraction mechanism and improvement in electronic conductivity profiles are validated through cyclic voltammetry and electrochemical impedance spectroscopy, respectively.
Journal of the electrochemical society
© 2012 The Electrochemical Society. This paper was published in Journal of the Electrochemical Society and is made available as an electronic reprint (preprint) with permission of The Electrochemical Society. The paper can be found at the following official DOI: [http://dx.doi.org/10.1149/2.039301jes]. One print or electronic copy may be made for personal use only. Systematic or multiple reproduction, distribution to multiple locations via electronic or other means, duplication of any material in this paper for a fee or for commercial purposes, or modification of the content of the paper is prohibited and is subject to penalties under law.