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Issue 43, 2015
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Nitrogen-doped carbon nanofibers with effectively encapsulated GeO2 nanocrystals for highly reversible lithium storage

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Abstract

Germanium dioxide is a promising high-capacity anode material for lithium-ion batteries, but it usually exhibits poor cycling stability due to its large volume change during the lithiation/delithiation process. In this paper, homogeneous dispersive GeO2 nanocrystals encapsulated by nitrogen-doped carbon nanofibers (GeO2-CNFs) were prepared by a facile electrospinning technology. The GeO2-CNF anode material exhibited remarkable capability at a high rate and excellent cycling stability (1031 mA h gāˆ’1 at 100 mA gāˆ’1 after 200 cycles). The good electrochemical performance could be attributed to the fact that ultra-uniform CNFs act as a blocking layer and a buffer layer to effectively hold GeO2 nanocrystals and facilitate the formation of a stable solid electrolyte interphase during Li+ intake/removal. The strategy is a simple and effective method which may be extended to other high-capacity anode materials with a large volume change and low electrical conductivity.

Graphical abstract: Nitrogen-doped carbon nanofibers with effectively encapsulated GeO2 nanocrystals for highly reversible lithium storage

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Supplementary files

Article information


Submitted
30 May 2015
Accepted
29 Aug 2015
First published
02 Sep 2015

J. Mater. Chem. A, 2015,3, 21699-21705
Article type
Paper

Nitrogen-doped carbon nanofibers with effectively encapsulated GeO2 nanocrystals for highly reversible lithium storage

L. Mei, M. Mao, S. Chou, H. Liu, S. Dou, D. H. L. Ng and J. Ma, J. Mater. Chem. A, 2015, 3, 21699
DOI: 10.1039/C5TA03911H

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