Yu, Yan and Shi, Yi and Chen, Chun-Hua (2007) Nanoporous cuprous oxide/lithia composite anode with capacity increasing characteristic and high rate capability. NANOTECHNOLOGY, 18 (5).
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Official URL: http://www.iop.org/EJ/abstract/0957-4484/18/5/0557...
Reticular nanoporous thin films of Cu2O–Li2O (Cu:Li = 1:1) composite electrodes supported on nickel foam and copper foil substrates were prepared under optimized conditions at 250 °C by the electrostatic spray deposition (ESD) technique. X-ray diffraction (XRD) and x-ray photoelectron spectroscopy (XPS) indicate that the as-deposited films are composed of Cu2O and Li2O. It is found that such a film as an electrode in lithium cells exhibits abnormal characteristics of strong and continuous capacity rise (up to 0.81% per cycle) and outstanding rate capability. Even before a long-time cycling, the specific capacity at 1, 5, 10 and 15 C is 400, 320, 310 and 305 mA h g−1 for the Cu2O–Li2O film supported on nickel foam substrate. XPS analysis and AC impedance spectroscopy suggest two mechanisms, i.e. valence-related capacity rise and surface-related capacity rise. These composite films may be useful in high power and high energy density lithium-ion batteries.
|Subjects:||Material Science > Tunnelling and microscopic phenomena|
Material Science > Nanostructured materials
|Deposited On:||10 Sep 2009 15:49|
|Last Modified:||10 Sep 2009 15:49|
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