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Title: Carbothermal synthesis, spectral and magnetic characterization and Li-cyclability of the Mo-cluster compounds, LiYMo3O8 and Mn2Mo3O8
Authors: Das, B.
Reddy, M.V. 
Krishnamoorthi, C. 
Tripathy, S.
Mahendiran, R. 
Rao, G.V.S.
Chowdari, B.V.R. 
Keywords: Carbothermal reduction
FT-IR spectra
Magnetic properties
Raman spectra
Issue Date: 30-Apr-2009
Citation: Das, B., Reddy, M.V., Krishnamoorthi, C., Tripathy, S., Mahendiran, R., Rao, G.V.S., Chowdari, B.V.R. (2009-04-30). Carbothermal synthesis, spectral and magnetic characterization and Li-cyclability of the Mo-cluster compounds, LiYMo3O8 and Mn2Mo3O8. Electrochimica Acta 54 (12) : 3360-3373. ScholarBank@NUS Repository.
Abstract: The molybdenum cluster compounds, LiYMo3O8 and Mn2Mo3O8 are prepared by the carbothermal reduction method and characterized by various techniques. The FT-IR at ambient temperature (RT), and Raman spectra at various temperatures (78-450 K) are reported for the first time and results are interpreted. Magnetic studies on Mn2Mo3O8 in the temperature range, 10-350 K confirm that it is ferrimagnetic, with TC = 39 K. Magnetic hysteresis and magnetization data at various fields and temperatures are presented. The Li-cyclability is investigated by galvanostatic cycling in the voltage range, 0.005-3.0 V vs. Li at 30 mA/g (0.08 C). LiYMo3O8 shows a total first-discharge capacity of 305 ±5 mAh/g whereas the first-charge capacity is only 180 mAh/g at RT. However, both values increased systematically with an increase in the cycle number and yielded a reversible capacity of 385 ±5 mAh/g at the end of 120th cycle. At 50 °C, the reversible capacity is 418 ±5 mAh/g at the 60th cycle. The coulombic efficiency ranges from 94% to 98%. The Li-cyclability behavior of Mn2Mo3O8 is entirely different from that of LiYMo3O8. The total first-discharge and charge capacities are 710 ± 5 and 565 ±5 mAh/g, but drastic capacity-fading occurs during cycling. The reversible capacity at the end of 50th cycle is only 205 ±5 mAh/g. Plausible reaction mechanisms are proposed and discussed based on the galavanostatic cycling, cyclic voltammetry, ex situ XRD, ex situ TEM and impedance spectral data. © 2009.
Source Title: Electrochimica Acta
ISSN: 00134686
DOI: 10.1016/j.electacta.2008.12.049
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