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Shanghai, China

Li W.-J.,Laser Chemistry Institute | Fu Z.-W.,Laser Chemistry Institute
Applied Surface Science | Year: 2010

Nanostructured WO3 thin film has been successfully fabricated by radio-frequency magnetron sputtering method and its electrochemistry with lithium was investigated for the first time. The reversible discharge capacity of WO3/Li cells cycled between 0.01 V and 4.0 V was found above 626 mAh/g during the first 60 cycles at the current density 0.02 mA/cm2. By using X-ray diffraction, X-ray photoelectron spectroscopy, transmission electron microscopy and selected-area electron diffraction measurements, the reversible conversion of WO3 into nanosized metal W and Li2O was revealed. The high reversible capacity and good recyclability of WO3 electrode made it become a promising cathode material for future rechargeable lithium batteries. © 2009 Elsevier B.V. All rights reserved. Source


Yu L.,Laser Chemistry Institute | Chen J.,Laser Chemistry Institute | Fu Z.-W.,Laser Chemistry Institute
Electrochimica Acta | Year: 2010

Li2Se-Sb2Se3 nanocomposites with a highly heterogeneous mixture have been fabricated by reactive pulsed laser deposition method. The electrochemical properties of the as-deposited Li2Se-Sb2Se3 thin film during the first charging and discharging have been investigated by the galvanostatic cycling and cyclic voltammetry measurements for the first time. By using ex situ X-ray diffraction (XRD), X-ray photoelectron spectra (XPS), scanning electron microscopy (SEM), high-resolution transmission electron microscopy (HRTEM), and selected-area electron diffraction (SAED) measurements, the decomposition of Li2Se driven by Sb2Se3 under the electrochemical potential is revealed. In the first cycle, the oxidation peaks at 2.5 V and 3.2 V and the reduction peaks at 2.0 V can be attributed to the decomposition and formation of Li2Se with the conversion reaction of Sb2Se3 into Sb2Se5. Our findings demonstrate that nanocomposite Li2Se-Sb2Se3 can possess very high electrochemical activity. These results present a special case of solid-state heterogeneous electrochemistry with both nanostructured binary materials. © 2009 Elsevier Ltd. All rights reserved. Source


Sun Q.,Laser Chemistry Institute | Li W.-J.,Laser Chemistry Institute | Fu Z.-W.,Laser Chemistry Institute
Solid State Sciences | Year: 2010

Antimony nitride thin film has been successfully fabricated by magnetron sputtering method and its electrochemistry with lithium was investigated for the first time. The reversible discharge capacity of Sb3N/Li cells cycled between 0.3 V and 3.0 V was found above 600 mAh/g. By using transmission electron microscopy and selected area electron diffraction measurements, the conversion reaction of Sb3N into Li3Sb and Li3N was revealed during the lithium electrochemical reaction of Sb3N thin film electrode. The high reversible capacity and the good cycleability made Sb3N one of promising anode materials for future rechargeable lithium batteries. © 2009 Elsevier Masson SAS. All rights reserved. Source

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