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Title: Inserting Sn nanoparticles into the pores of TiO2-x-C nanofibers by lithiation
Authors: Li, XY
Chen, YM
Wang, HT
Yao, HM 
Huang, HT 
Mai, YW
Hu, N
Zhou, LM 
Keywords: Electrospinning
In situ TEM
Lithiation-induced insertion
Lithium-ion batteries
TiO2-x-C-Sn hybrid nanofibers
Issue Date: 2016
Publisher: Wiley-VCH
Source: Advanced functional materials, 2016, v. 26, no. 3, p. 376-383 How to cite?
Journal: Advanced functional materials 
Abstract: Tin holds promise as an anode material for lithium-ion batteries (LIBs) because of its high theoretical capacity, but its cycle life is limited by structural degradation. Herein, a novel approach is exploited to insert Sn nanoparticles into the pores of highly stable titanium dioxide-carbon (TiO2-x-C) nanofiber substrates that can effectively localize the postformed smaller Sn nanoparticles, thereby address the problem of structural degradation, and thus achieve improved anode performance. During first lithiation, a Li4.4Sn alloy is inserted into the pores surrounding the initial Sn nanoparticles in TiO2-x-C nanofibers by its large volume expansion. Thereafter, the original Sn nanoparticle with a diameter of about 150 nm cannot be recovered by the delithiation because of the surface absorption between inserted Sn nanoparticles and the TiO2-x-C substrate, resulting in many smaller Sn nanoparticles remaining in the pores. Batteries containing these porous TiO2-x-C-Sn nanofibers exhibit a high capacity of 957 mAh g-1 after 200 cycles at 0.1 A g-1 and can cycle over 10 000 times at 3 A g-1 while retaining 82.3% of their capacity, which represents the longest cycling life of Sn-based anodes for LIBs so far. This interesting method can provide new avenues for other high-capacity anode material systems that suffer from significant volume expansion.
ISSN: 1616-301X
DOI: 10.1002/adfm.201503711
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