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Title: Carbon-Coated Nanophase CaMoO4 as Anode Material for Li Ion Batteries
Authors: Sharma, N. 
Shaju, K.M. 
Subba Rao, G.V. 
Chowdari, B.V.R. 
Dong, Z.L.
White, T.J.
Issue Date: 10-Feb-2004
Citation: Sharma, N., Shaju, K.M., Subba Rao, G.V., Chowdari, B.V.R., Dong, Z.L., White, T.J. (2004-02-10). Carbon-Coated Nanophase CaMoO4 as Anode Material for Li Ion Batteries. Chemistry of Materials 16 (3) : 504-512. ScholarBank@NUS Repository.
Abstract: Pure and carbon (C)-coated CaMoO4 were synthesized by solution precipitation and sol-gel methods, and their electrochemical properties were studied vs Li by galvanostatic cycling and cyclic voltammetry (CV). Combined X-ray diffraction, SEM, and TEM results revealed the formation of nanocrystalline particles with the scheelite structure, the morphology being a function of the synthetic procedure. TEM of 10% C-coated CaMoO4 shows the amorphous nature of carbon on the crystalline particles with a thickness of 8-12 nm. Galvanostatic data in the voltage range of 0.005-2.5 V up to 50 cycles at a rate of 60 mA/g revealed that the 10% C-coated CaMoO 4 gave the highest reversible capacities. At the 20th discharge cycle, the capacity values (mA h/g) are as follows: solution precipitated, 190; sol-gel, 268; 5% C-coated, 401; and 10% C-coated, 508. The latter value corresponds to 3.8 mol of recyclable Li. The improvement in the interparticle electronic conductivity imparted by the C-coating led to superior performance. The Coulombic efficiency for all the compositions is >98%. Galvanostatic cycling results are supplemented by the CV data. A plausible mechanism for charge-discharge cycling has been proposed.
Source Title: Chemistry of Materials
ISSN: 08974756
DOI: 10.1021/cm0348287
Appears in Collections:Staff Publications

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