Please use this identifier to cite or link to this item:
|Title:||Synthesis, characterization, and electrochemical cycling behavior of the Ru-doped spinel, Li[Mn2-xRux]O4 (x=0, 0.1, and 0.25)||Authors:||Reddy, M.V.
Subba Rao, G.V.
|Issue Date:||2009||Citation:||Reddy, M.V., Manoharan, S.S., John, J., Singh, B., Subba Rao, G.V., Chowdari, B.V.R. (2009). Synthesis, characterization, and electrochemical cycling behavior of the Ru-doped spinel, Li[Mn2-xRux]O4 (x=0, 0.1, and 0.25). Journal of the Electrochemical Society 156 (8) : A652-A660. ScholarBank@NUS Repository. https://doi.org/10.1149/1.3139013||Abstract:||Pure and Ru-doped Li[Mn2-xRux]O4 (x=0.1 and 0.25) spinel compounds are prepared by the high temperature solid-state reaction and characterized by X-ray diffraction (XRD), scanning electron microscopy, Brunauer, Emmett, and Teller surface area, density, IR, Raman spectroscopy, and X-ray absorption spectroscopy. XRD studies show single-phase compounds with the cubic spinel structure and a decrease in (Mn-O) and an increase in (Li-O) bond lengths on Ru doping. The electrochemical cycling behavior of Li[Mn2-xRux]O4 is examined by galvanostatic cycling and cyclic voltammetry (CV). The CV shows that the Mn 3+Mn4+ couple lies in the range from ∼4.0 to ∼4.2 V and the spinel-to-double-hexagonal (S-DH) transition at ∼4.5 V in agreement with results in the literature. The Ru4+ Ru5+ redox couple operates at ∼4.3 V vs Li in the spinel structure. The S-DH phase transition is suppressed on Ru doping. Charge-discharge cycling, up to 25 or 40 cycles, in the voltage ranges 3.5-4.3 and 3.5-4.6 V vs Li at 0.14C rate gave initial charge capacities ranging from 118 to 139 mAh g-1 for various x. Compositions with x=0.1 and 0.25 showed smaller initial capacity loss and smaller capacity fading during cycling as compared to x=0. For x=0.25 in the voltage range 3.5-4.6 V and 2-25 cycles, the capacity fade is only 9% thereby showing the beneficial effect of Ru doping, by way of suppression of S-DH transition, participation of Ru-redox couple, and better electronic conductivity of the compound during cycling, in comparison to pure Li Mn2 O4. © 2009 The Electrochemical Society.||Source Title:||Journal of the Electrochemical Society||URI:||http://scholarbank.nus.edu.sg/handle/10635/98200||ISSN:||00134651||DOI:||10.1149/1.3139013|
|Appears in Collections:||Staff Publications|
Show full item record
Files in This Item:
There are no files associated with this item.
checked on Jan 14, 2021
WEB OF SCIENCETM
checked on Jan 14, 2021
checked on Jan 17, 2021
Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.