Carbon-coated nanophase CaMoO4 as anode material for Li ion batteries
Pure and carbon (C)-coated CaMoO4 were synthesized by solution precipitation and solgel methods, and their electrochemical properties were studied vs Li by galvanostatic cycling and cyclic voltammetry (CV). Combined X-ray diffraction, SEM...
| Main Authors: | , , , , , |
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| Other Authors: | |
| Format: | Journal Article |
| Language: | English |
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2012
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| Online Access: | https://hdl.handle.net/10356/94292 http://hdl.handle.net/10220/7447 |
| _version_ | 1811697512038268928 |
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| author | Sharma, N. Shaju, K. M. Rao, G. V. Subba Chowdari, Bobba V. R. Dong, Zhili White, Timothy John |
| author2 | School of Materials Science & Engineering |
| author_facet | School of Materials Science & Engineering Sharma, N. Shaju, K. M. Rao, G. V. Subba Chowdari, Bobba V. R. Dong, Zhili White, Timothy John |
| author_sort | Sharma, N. |
| collection | NTU |
| description | Pure and carbon (C)-coated CaMoO4 were synthesized by solution precipitation and solgel
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 CaMoO4 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. |
| first_indexed | 2024-10-01T07:56:26Z |
| format | Journal Article |
| id | ntu-10356/94292 |
| institution | Nanyang Technological University |
| language | English |
| last_indexed | 2024-10-01T07:56:26Z |
| publishDate | 2012 |
| record_format | dspace |
| spelling | ntu-10356/942922020-06-01T10:01:38Z Carbon-coated nanophase CaMoO4 as anode material for Li ion batteries Sharma, N. Shaju, K. M. Rao, G. V. Subba Chowdari, Bobba V. R. Dong, Zhili White, Timothy John School of Materials Science & Engineering DRNTU::Engineering::Materials::Nanostructured materials Pure and carbon (C)-coated CaMoO4 were synthesized by solution precipitation and solgel 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 CaMoO4 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. 2012-01-06T03:51:08Z 2019-12-06T18:53:44Z 2012-01-06T03:51:08Z 2019-12-06T18:53:44Z 2004 2004 Journal Article Sharma, N., Shaju, K. M., Rao, G. V. S., Chowdari, B. V. R., Dong, Z. L., & White, T. J. (2004). Carbon-Coated Nanophase CaMoO4 as Anode Material for Li Ion Batteries, Chemistry of Materials, 16(3), 504-512. https://hdl.handle.net/10356/94292 http://hdl.handle.net/10220/7447 10.1021/cm0348287 en Chemistry of materials © 2004 American Chemical Society. |
| spellingShingle | DRNTU::Engineering::Materials::Nanostructured materials Sharma, N. Shaju, K. M. Rao, G. V. Subba Chowdari, Bobba V. R. Dong, Zhili White, Timothy John Carbon-coated nanophase CaMoO4 as anode material for Li ion batteries |
| title | Carbon-coated nanophase CaMoO4 as anode material for Li ion batteries |
| title_full | Carbon-coated nanophase CaMoO4 as anode material for Li ion batteries |
| title_fullStr | Carbon-coated nanophase CaMoO4 as anode material for Li ion batteries |
| title_full_unstemmed | Carbon-coated nanophase CaMoO4 as anode material for Li ion batteries |
| title_short | Carbon-coated nanophase CaMoO4 as anode material for Li ion batteries |
| title_sort | carbon coated nanophase camoo4 as anode material for li ion batteries |
| topic | DRNTU::Engineering::Materials::Nanostructured materials |
| url | https://hdl.handle.net/10356/94292 http://hdl.handle.net/10220/7447 |
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