Li+ distribution into V2O5 films resulting from electrochemical intercalation reactions

Journal of the Brazilian Chemical Society

Franco Decker²  Frederique Donsanti²  Anna Maria Salvi¹  Neluta Ibris¹  James E. Castle¹  Franz Martin¹  David Alamarguy¹  Angela Surca Vuk¹  Boris Orel¹  Airton Lourenco¹ 

[1] ,Università di Roma ‘La Sapienza’ Dipartimento di Chimica Roma,Italia

关键词: electrochromism;    V2O5;    Li insertion;    SIMS depth profile;    ITO;   

DOI  :  10.1590/S0103-50532008000400009

来源: SciELO

【 摘 要 】

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 cm². 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.

【 授权许可】

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