Chan, Candace K. and Peng, Hailin and Twesten, Ray D. and Jarausch, Konrad and Zhang, Xiao Feng and Cui, Yi (2007) Fast, completely reversible Li insertion in vanadium pentoxide nanoribbons. NANO LETTERS, 7 (2). pp. 490-495.
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Official URL: http://dx.doi.org/10.1021/nl062883j
Layered-structure nanoribbons with efficient electron transport and short lithium ion insertion lengths are promising candidates for Li battery applications. Here we studied at the single nanostructure level the chemical, structural, and electrical transformations of V2O5 nanoribbons. We found that transformation of V2O5 into the omega-Li3V2O5 phase depends not only on the width but also the thickness of the nanoribbons. Transformation can take place within 10 s in thin nanoribbons, suggesting a Li diffusion constant 3 orders of magnitude faster than in bulk materials, resulting in a significant increase in battery power density (360 C power rate). For the first time, complete delithiation of omega-Li3V2O5 back to the single-crystalline, pristine V2O5 nanoribbon was observed, indicating a 30% higher energy density. These new observations are attributed to the ability of facile strain relaxation and phase transformation at the nanoscale. In addition, efficient electronic transport can be maintained to charge a Li3V2O5 nanoribbon within less than 5 s. These exciting nanosize effects can be exploited to fabricate high-performance Li batteries for applications in electric and hybrid electric vehicles.
|Subjects:||Physical Science > Nano objects|
Technology > Nanotechnology and energy applications
Material Science > Nanochemistry
Material Science > Nanostructured materials
|Deposited By:||Anuj Seth|
|Deposited On:||06 Jan 2009 15:49|
|Last Modified:||20 Jan 2009 10:54|
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