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Title: Anodic properties of tin oxides with pyrochlore structure for lithium ion batteries
Authors: Sharma, N. 
Subba Rao, G.V. 
Chowdari, B.V.R. 
Keywords: Electrochemical properties
Li-ion batteries
Tin oxides
Issue Date: 13-Sep-2006
Citation: Sharma, N., Subba Rao, G.V., Chowdari, B.V.R. (2006-09-13). Anodic properties of tin oxides with pyrochlore structure for lithium ion batteries. Journal of Power Sources 159 (1 SPEC. ISS.) : 340-344. ScholarBank@NUS Repository.
Abstract: Mixed tin oxides, M2Sn2O7 (M = Y, Nd), with cubic pyrochlore structure were synthesized and characterized by X-ray diffraction and SEM. Galvanostatic cycling versus Li metal in the voltage range, 0.005-1.0 V at the current density of 60 mA g-1 showed that the first-discharge capacities are 913 and 722 mA hg-1 whereas the first-charge capacities are 350 and 265 (±3) mA hg-1, for M = Y and Nd, respectively. The corresponding number of moles of recyclable Li are 3.4 and 3.2 for M = Y and Nd. Crystal structure destruction occurs during the first-discharge leading to the formation of nano-particles of Sn-metal and finally Li4.4Sn in a matrix of Li-M-O. After 50 cycles, both compounds showed a capacity-retention of 89 (±1)% of the 10th cycle reversible capacity. The coulombic efficiency is ∼98%. The average charge and discharge voltages in both compounds are 0.5 and 0.25 V, respectively. Cyclic voltammograms complement the galvanostatic results and showed that a good operating voltage range is 0.005-1.0 V. The electrodic performances of M2Sn2O7 have been compared with those exhibited by other crystalline ternary tin oxides. © 2006 Elsevier B.V. All rights reserved.
Source Title: Journal of Power Sources
ISSN: 03787753
DOI: 10.1016/j.jpowsour.2006.04.050
Appears in Collections:Staff Publications

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