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Title: 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

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 improvedmore » 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.« less
Authors:
 [1] ;  [2] ; ;  [1] ;  [3]
  1. School of Material Science and Technology Jiangsu University, Zhenjiang (China)
  2. (China)
  3. Automobile Engineering Research Institute Jiangsu University, Zhenjiang (China)
Publication Date:
OSTI Identifier:
22285227
Resource Type:
Journal Article
Resource Relation:
Journal Name: Materials Research Bulletin; Journal Volume: 48; Journal 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)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; BAKELITE; CAPACITY; CARBON; CATHODES; ELECTROCHEMISTRY; PROCESS HEAT; SCANNING ELECTRON MICROSCOPY; SPECTROSCOPY; SYNTHESIS; X-RAY DIFFRACTION