Li+ distribution into V2O5 films resulting from electrochemical intercalation reactions

Journal of the Brazilian Chemical Society

National Institute of Chemistry, Ljubljana, Slovenia¹  Lourenco, Airton¹  Salvi, Anna Maria¹  Università di Roma ‘La Sapienza’, Roma, Italia¹  Ibris, Neluta¹  Alamarguy, David¹  Castle, James E.¹  Universidade Estadual de Campinas, Campinas, Brazil¹  Vuk, Angela Surca¹  Decker, Franco¹  Martin, Franz¹  Universita degli Studi della Basilicata, Potenza, Italia¹  Orel, Boris¹  University of Surrey, Guildford, United Kingdom¹  Donsanti, Frederique¹ 

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

DOI  :  10.1590/S0103-50532008000400009

学科分类：化学（综合）

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】

Unknown