Synthesis and electrochemical characterizations of nano-La{sub 2}O{sub 3}-coated nanostructure LiMn{sub 2}O{sub 4} cathode materials for rechargeable lithium batteries

Journal Article · Wed Dec 15 00:00:00 EST 2010 · Materials Research Bulletin

DOI:https://doi.org/10.1016/J.MATERRESBULL.2010.09.021· OSTI ID:22209946

Arumugam, D. ^[1]

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1. Advanced Lithium Battery Research Lab, Department of Industrial Chemistry, Alagappa University, Alagappa Puram, Karaikudi 630 003, Tamil Nadu (India)

LiMn{sub 2}O{sub 4} spinel cathode materials were coated with 1.0, 2.0 and 3.0 wt.% of La{sub 2}O{sub 3} by polymeric process, followed by calcinations at 850 {sup o}C for 6 h in air. The surface coated LiMn{sub 2}O{sub 4} cathode materials were physically characterized using X-ray diffraction, scanning electron microscopy, transmission electron microscopy and XPS. XRD patterns of La{sub 2}O{sub 3}-coated LiMn{sub 2}O{sub 4} revealed that the coating did not affect the crystal structure and space group Fd3m of the cathode materials, compared to the uncoated LiMn{sub 2}O{sub 4}. The surface morphology and particle agglomeration were investigated using scanning electron microscopy and the TEM image showed a compact coating layer on the surface of the core materials that had average thickness of about 100 nm. XPS data illustrated that the La{sub 2}O{sub 3} was completely coated over the surface of the LiMn{sub 2}O{sub 4} core cathode materials. The galvanostatic charge and discharge of the uncoated and La{sub 2}O{sub 3}-coated LiMn{sub 2}O{sub 4} cathode materials were carried out in the potential range of 3.0 and 4.5 V at 30 {sup o}C and 60 {sup o}C. Among them, 2.0 wt.% of La{sub 2}O{sub 3}-coated spinel LiMn{sub 2}O{sub 4} cathode has improved the structural stability, high reversible capacity and excellent electrochemical performances of the rechargeable lithium batteries.

• OSTI ID: 22209946
• Journal Information: Materials Research Bulletin, Vol. 45, Issue 12; Other Information: Copyright (c) 2010 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA); ISSN 0025-5408
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
AGGLOMERATION
CATHODES
CUBIC LATTICES
LANTHANUM OXIDES
LAYERS
NANOSTRUCTURES
SCANNING ELECTRON MICROSCOPY
SOL-GEL PROCESS
SPACE GROUPS
SPINELS
SYNTHESIS
THICKNESS
TRANSMISSION ELECTRON MICROSCOPY
X-RAY DIFFRACTION
X-RAY PHOTOELECTRON SPECTROSCOPY