Journal
ELECTROCHIMICA ACTA
Volume 118, Issue -, Pages 100-105Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2013.12.009
Keywords
Si; Electrospinning; Nanofiber; Carbon composite; Lithium rechargeable battery
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Funding
- National Research Foundation of Korea
- Ministry of Education, Science, and Technology [NRF-2010-C1AAA001-0029018]
- Fundamental R&D Program for Technology of World Premier Materials
- Ministry of Knowledge Economy [10037918]
- Korea Evaluation Institute of Industrial Technology (KEIT) [10037918] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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We demonstrate a simple electrospinning for preparing Si-carbon composite Nanofiber (NF) in which aciniform aggregates of Si particles are well encased by amorphous carbon. The Si-carbon composite NF exhibit a significantly improved electrochemical performance with a high specific capacity of 1250 mAh.g(-1) and a superior cycling performance during 50 cycles at a rate of 0.2 C. More importantly, Si-carbon composite NF maintain about 70% of initial capacity at 0.2 C and an excellent cycling stability even at 25 times higher current density compared to the initial condition, proving that it has superb kinetics compared to ever reported Si or SiOx materials. The electrochemical superiority of Si-carbon composite NF can be attributed to amorphous carbon framework accommodating the inherent volume expansion of Si during lithiation as well as the enlarged contact area between active materials and conducting agent attributed to the morphological characteristics of its one dimensional (1D) nanostructure. (C) 2013 Elsevier Ltd. All rights reserved.
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