A facile method to synthesize carbon coated Li{sub 1.2}Ni{sub 0.2}Mn{sub 0.6}O{sub 2} with improved performance

Journal Article · Fri Nov 15 00:00:00 EST 2013 · Materials Research Bulletin

DOI:https://doi.org/10.1016/J.MATERRESBULL.2013.07.024· OSTI ID:22285227

Liu, Yunjian ^[1]; Gao, Yanyong; Lv, Jun ^[1]; Chen, Long ^[2]

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1. School of Material Science and Technology Jiangsu University, Zhenjiang (China)
2. Automobile Engineering Research Institute Jiangsu University, Zhenjiang (China)

Graphical abstract: Li{sub 1.2}Ni{sub 0.2}Mn{sub 0.6}O{sub 2} powders are synthesized and then coated by decomposed carbon. The discharge capacity of carbon-coated cathode at 0.1 and 5 C are 246 and 125 mAhg{sup −1}, while those of ball-milled cathode are 222 and 49 mAhg{sup −1}. - Highlights: • A simple method was applied to synthesize carbon-coated Li{sub 1.2}Ni{sub 0.2}Mn{sub 0.6}O{sub 2}. • The discharge capacities of carbon-coated sample at 0.1 and 5.0 C rates are 246 and 125 mAh/g. • Capacity retention of carbon-coated electrode after 50 cycles is 97.5%. - Abstract: Carbon-coated Li{sub 1.2}Ni{sub 0.2}Mn{sub 0.6}O{sub 2} powders have been synthesized with Bakelite and heat process in air. The effect of carbon coating on the physical and electrochemical properties have been discussed through the characterizations of X-ray diffraction (XRD), scanning electron microscopy (SEM), electrochemical impedance spectroscopy (EIS), discharge and rate tests. The carbon-coated cathode exhibits much improved first discharge capacity and rate capability than the pristine sample. The discharge capacity at 0.1 and 5.0 C rates are 246 and 125 mAhg{sup −1}, while that of pristine are only about 222 and 49 mAhg{sup −1}, respectively. The capacity retention of Li{sub 1.2}Ni{sub 0.2}Mn{sub 0.6}O{sub 2} electrode after 50 cycles is improved from 89.8 to 97.5% after carbon coating. EIS results indicate that R{sub ct} of Li{sub 1.2}Ni{sub 0.2}Mn{sub 0.6}O{sub 2} electrode is decreased from 62 to 37 Ω after carbon coating.

• OSTI ID: 22285227
• Journal Information: Materials Research Bulletin, Vol. 48, Issue 11; Other Information: Copyright (c) 2013 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

36 MATERIALS SCIENCE
BAKELITE
CAPACITY
CARBON
CATHODES
ELECTROCHEMISTRY
PROCESS HEAT
SCANNING ELECTRON MICROSCOPY
SPECTROSCOPY
SYNTHESIS
X-RAY DIFFRACTION