We studied interface effects of thin film V2O5 electrodes on top of indium tin oxide (ITO) glass for Li intercalation by means of a combination of methods: depth-profiling by secondary ion mass spectroscopy (SIMS), electrochemical insertion-extraction of lithium ions by slow-scan cyclic voltammetry (SSCV) and by potentiostatic intermittent titration technique (PITT). We show that the Li+ distribution inside the oxide film is always far from homogeneous, and that different diffusion paths (parallel to interfaces as well as perpendicular to them) have to be considered in experiments with electrodes having areas of few cm(2). The exposed edge formed when cutting out coupons from the coated glass plate supporting the V2O5 electrode plays a significant role in the process, because it exposes the V2O5-ITO interface to the electrolyte.
Li+ distribution into V2O5 films resulting from electrochemical intercalation reactions / Decker, Franco; Frederique, Donsanti; Anna Maria, Salvi; Neluta, Ibris; James E., Castle; Franz, Martin; David, Alamarguy; Angela Surca, Vuk; Boris, Orel; Airton, Lourenco. - In: JOURNAL OF THE BRAZILIAN CHEMICAL SOCIETY. - ISSN 0103-5053. - 19:4(2008), pp. 667-671. (Intervento presentato al convegno 16th Brazillian Symposium of Electrochemistry and Electroanalytical Chemistry tenutosi a Aguas de Lindoia, BRAZIL nel APR 15-19, 2007) [10.1590/s0103-50532008000400009].
Li+ distribution into V2O5 films resulting from electrochemical intercalation reactions
DECKER, Franco;
2008
Abstract
We studied interface effects of thin film V2O5 electrodes on top of indium tin oxide (ITO) glass for Li intercalation by means of a combination of methods: depth-profiling by secondary ion mass spectroscopy (SIMS), electrochemical insertion-extraction of lithium ions by slow-scan cyclic voltammetry (SSCV) and by potentiostatic intermittent titration technique (PITT). We show that the Li+ distribution inside the oxide film is always far from homogeneous, and that different diffusion paths (parallel to interfaces as well as perpendicular to them) have to be considered in experiments with electrodes having areas of few cm(2). The exposed edge formed when cutting out coupons from the coated glass plate supporting the V2O5 electrode plays a significant role in the process, because it exposes the V2O5-ITO interface to the electrolyte.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
