Journal
CARBON
Volume 60, Issue -, Pages 215-220Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.carbon.2013.04.014
Keywords
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Funding
- National Natural Science Foundation of China [51201002, 51071001]
- Research Grants Council of the HKSAR Government [PolyU 5236/12E]
- Hong Kong Polytechnic University [G-YK59, 4-ZZ7L]
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The synthesis of NiO/C nanocapsules with NiO nanoparticles as the core and onion-like carbon layers as the shell is reported. The NiO/C nanocapsules deliver an initial discharge capacity of 1689.4 mAh g(-1) at 0.5 C and maintain a high reversible capacity of 1157.7 mAh g(-1) after 50 cycles compared to the NiO nanoparticles of 383.5 mAh g(-1). As an anode material for lithium ion batteries, the NiO/C nanocapsules exhibit a remarkable discharge capacity, a high rate charge-discharge capability and an excellent cycling stability. The improvements are ascribed to the fact that the onion-like carbon shells not only can provide enough voids to accommodate the volume change of NiO nanoparticles but also can prevent the formation of solid electrolyte interface (SEI) films on the surface of the NiO nanoparticles and hence the direct contact of Ni and SEI films upon lithium extraction. (C) 2013 Elsevier Ltd. All rights reserved.
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