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Study of lithium diffusion in RF sputtered Nickel/Vanadium mixed oxides thin films
 

Summary: Study of lithium diffusion in RF sputtered NickelÁ/Vanadium mixed
oxides thin films
F. Artuso a,
*, F. Bonino a
, F. Decker a
, A. Lourenco b
, E. Masetti c
a
Chemistry Department, `Istituto Nazionale di Fisica della Materia', University of Roma `La Sapienza', I-00185 Roma, Italy
b
Instituto de Fisica, University of Campinas, Sa~o Paulo, Brazil
c
ENEA-C.R. Casaccia, Via Anguillarese 301, I-00060 Roma, Italy
Received 22 June 2001; received in revised form 29 September 2001
Abstract
The kinetics of electrochemical lithium insertion inside RF sputtered Ni/V mixed oxides thin films have been investigated
employing different electrochemical techniques. The AC electrochemical impedance spectra, recorded after 10 cycles, showed three
steps clearly involved in the intercalation mechanism of lithium in the oxide films: (i) a charge transfer process to the electrolyte/
electrode interface; (ii) a solid-state diffusion of Li; and (iii) a space limited diffusion due to the finite volume of the film. This latter
portion of the impedance spectra was used to calculate the Li chemical diffusion coefficients (DLi). DLi values show an initial

  

Source: Artuso, Florinda - Department of Environment, Global Change and Sustainable Development, ENEA

 

Collections: Energy Storage, Conversion and Utilization