Journal
JOURNAL OF ALLOYS AND COMPOUNDS
Volume 530, Issue -, Pages 30-35Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2012.03.096
Keywords
Spray drying; Flake graphite/silicon/carbon composite; Spherical composite; Anode material; Li-ion battery
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Funding
- Science and Technology Programs of Hunan Province [2009FJ1002]
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Using nano-Si, glucose and flake graphite of similar to 0.5 mu m as raw materials, flake graphite/silicon/carbon composite is successfully synthesized via spray drying and subsequent pyrolysis. The samples are characterized by XRD, SEM, TEM and electrochemical measurements. The composite is composed of flake graphite, nano-Si and amorphous glucose-pyrolyzed carbon and presents good spherical appearance. Some micron pores arising from the decomposition of glucose exist on the surface of the composite particles. The composite has a high reversible capacity of 602.7 mAh/g with an initial coulombic efficiency of 69.71%, and shows nearly the same cycleability as the commercial graphite in 20 cycles. Both the glucose-pyrolyzed carbon and the micron pores play important roles in improving the cycleability of the composite. The flake graphite/silicon/carbon composite electrode is a potential alternative to graphite for high energy-density lithium ion batteries. (C) 2012 Elsevier B.V. All rights reserved.
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