Alanine-assisted low-temperature combustion synthesis of nanocrystalline LiMn2O4 for lithium-ion batteries
IR@CGCRI: CSIR-Central Glass and Ceramic Research Institute, Kolkata
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| Title |
Alanine-assisted low-temperature combustion synthesis of nanocrystalline LiMn2O4 for lithium-ion batteries
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| Creator |
Raja, Mir Wasim
Mahanty, Sourindra Ghosh, P Basu, Rajendra Nath Maiti, Himadri Sekhar |
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| Subject |
Electronics
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| Description |
Nanocrystalline LiMn2O4 powders have been synthesized by combustion process in a single step using a novel fuel, L-alanine. Thermogravimetric analysis and differential thermal analysis of the gel indicate a sharp combustion at a temperature as low as 149 degrees C. Quantitative phase analysis of X-ray diffraction data shows about 97% of phase purity in the as-synthesized powder, which on further calcination at 700 degrees C becomes single phase LiMn2O4. High Brunauer, Emmett, and Teller surface area values obtained for ash (53 m(2)/g) and calcined powder (23 m(2)/g) indicate the ultrafine nature of the powder. Average crystallite size is found to be similar to 60-70 nm from X-ray diffraction analysis and transmission electron microscopy. Fourier transformed infra-red spectrum shows two strong bands at 615 and 511 cm(-1) originating from asymmetrical stretching of MnO6 octahedra. A nominal composition of Li-0.88 Mn2O4 is calculated from the inductive coupled plasma analysis. From UV-vis spectroscopy, an optical band gap of 1.43 eV is estimated which is assigned to a transition between t(2g) and e(g) bands of Mn 3d. Electrochemical charge-discharge profiles show typical LiMn2O4 behavior with a specific capacity of 76 mAh/g.
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| Publisher |
Elsevier
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| Date |
2007-08-07
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| Type |
Article
PeerReviewed |
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| Format |
application/pdf
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| Identifier |
http://cgcri.csircentral.net/578/1/Mater_Res_Bull_42_(2007)_1499%E2%80%931506.pdf
Raja, Mir Wasim and Mahanty, Sourindra and Ghosh, P and Basu, Rajendra Nath and Maiti, Himadri Sekhar (2007) Alanine-assisted low-temperature combustion synthesis of nanocrystalline LiMn2O4 for lithium-ion batteries. Materials Research Bulletin, 42 (8). pp. 1499-1506. ISSN 0025-5408 |
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| Relation |
http://www.sciencedirect.com/science/journal/00255408/42/8
http://cgcri.csircentral.net/578/ |
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