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Title: Li diffusion in spinel LiNi0.5Mn1.5O4 thin films prepared by pulsed laser deposition
Authors: Xia, H.
Lu, L. 
Issue Date: 2007
Citation: Xia, H., Lu, L. (2007). Li diffusion in spinel LiNi0.5Mn1.5O4 thin films prepared by pulsed laser deposition. Physica Scripta T T129 : 43-48. ScholarBank@NUS Repository.
Abstract: Spinel LiNi0.5Mn1.5O4 thin film electrodes of 0.5 μm thickness were prepared on polished stainless steel (SS) substrates by pulsed laser deposition. Kinetics and mass-transport of Li intercalation/deintercalation were investigated by means of cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS) and potentiostatic intermittent titration technique (PITT). The CV measurements indicate that there exists a small amount of Mn3 + in the film and Li transportation is controlled by diffusion at high scan rates. EIS measurements show a potential independent low charge-transfer resistance region between 4.1 and 4.7 V and a stable surface layer resistance through the full potential range. The chemical diffusion coefficients of Li in the LiNi0.5Mn1.5O 4 thin film obtained by EIS and PITT have been found to be in the range of 10-12-10-10 cm2 s-1 depending on the electrode potential. Two minima were found for from PITT at potentials close to the peak potentials of the corresponding CV. © 2007 The Royal Swedish Academy of Sciences.
Source Title: Physica Scripta T
ISSN: 02811847
DOI: 10.1088/0031-8949/2007/T129/010
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