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Uniform nano-Sn/C composite anodes for lithium ion batteries.

Nano-Sn/C composites are ideal anode materials for high energy and power density Li-ion batteries. However, because of the low melting point of Sn and the tendency of grain growth, especially during high temperature carbonization, it has been a significant challenge to create well-dispersed ultrasma... Full description

Journal Title: Nano letters February 13, 2013, Vol.13(2), pp.470-474
Main Author: Xu, Yunhua
Other Authors: Liu, Qing , Zhu, Yujie , Liu, Yihang , Langrock, Alex , Zachariah, Michael R , Wang, Chunsheng
Format: Electronic Article Electronic Article
Language: English
Subjects:
ID: E-ISSN: 1530-6992 ; DOI: 10.1021/nl303823k
Link: http://search.proquest.com/docview/1287886386/?pq-origsite=primo
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title: Uniform nano-Sn/C composite anodes for lithium ion batteries.
format: Article
creator:
  • Xu, Yunhua
  • Liu, Qing
  • Zhu, Yujie
  • Liu, Yihang
  • Langrock, Alex
  • Zachariah, Michael R
  • Wang, Chunsheng
subjects:
  • Engineering
ispartof: Nano letters, February 13, 2013, Vol.13(2), pp.470-474
description: Nano-Sn/C composites are ideal anode materials for high energy and power density Li-ion batteries. However, because of the low melting point of Sn and the tendency of grain growth, especially during high temperature carbonization, it has been a significant challenge to create well-dispersed ultrasmall Sn nanoparticles within a carbon matrix. In this paper, we demonstrate an aerosol spray pyrolysis technique, as a facile and scalable method, to synthesize a nano-Sn/C composite with uniformly dispersed 10 nm nano-Sn within a spherical carbon matrix. The discharge capacity of nano-Sn/C composite sphere anodes maintains the initial capacity of 710 mAh/g after 130 cycles at 0.25 C. The nano-Sn/C composite sphere anodes can provide ~600 mAh/g even at a high rate of 20 C. To the best of our knowledge, such high rate performance for Sn anodes has not been reported previously. The exceptional performance of the nano-Sn/C composite is attributed to the unique nano-Sn/C structure: (1) carbon matrix offers mechanical support to accommodate the stress associated with the large volume change of nano-Sn, thus alleviating pulverization; (2) the carbon matrix prevents Sn nanoparticle agglomeration upon prolonged cycling; and (3) carbon network provides continuous path for Li ions and electrons inside the nano-Sn/C composite spheres.
language: eng
source:
identifier: E-ISSN: 1530-6992 ; DOI: 10.1021/nl303823k
fulltext: fulltext
issn:
  • 15306992
  • 1530-6992
url: Link


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titleUniform nano-Sn/C composite anodes for lithium ion batteries.
creatorXu, Yunhua ; Liu, Qing ; Zhu, Yujie ; Liu, Yihang ; Langrock, Alex ; Zachariah, Michael R ; Wang, Chunsheng
contributorXu, Yunhua (correspondence author) ; Xu, Yunhua (record owner)
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descriptionNano-Sn/C composites are ideal anode materials for high energy and power density Li-ion batteries. However, because of the low melting point of Sn and the tendency of grain growth, especially during high temperature carbonization, it has been a significant challenge to create well-dispersed ultrasmall Sn nanoparticles within a carbon matrix. In this paper, we demonstrate an aerosol spray pyrolysis technique, as a facile and scalable method, to synthesize a nano-Sn/C composite with uniformly dispersed 10 nm nano-Sn within a spherical carbon matrix. The discharge capacity of nano-Sn/C composite sphere anodes maintains the initial capacity of 710 mAh/g after 130 cycles at 0.25 C. The nano-Sn/C composite sphere anodes can provide ~600 mAh/g even at a high rate of 20 C. To the best of our knowledge, such high rate performance for Sn anodes has not been reported previously. The exceptional performance of the nano-Sn/C composite is attributed to the unique nano-Sn/C structure: (1) carbon matrix offers mechanical support to accommodate the stress associated with the large volume change of nano-Sn, thus alleviating pulverization; (2) the carbon matrix prevents Sn nanoparticle agglomeration upon prolonged cycling; and (3) carbon network provides continuous path for Li ions and electrons inside the nano-Sn/C composite spheres.
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