Nanoscale depth and lithiation dependence of V2O5 band structure by cathodoluminescence spectroscopy. Issue 23 (5th June 2020)

• Record Type: Journal Article
• Authors: Walker, Mitchell J.; Jarry, Angelique; Pronin, Nick; Ballard, Jake; Rubloff, Gary W.; Brillson, Leonard J.
• Is Part Of: Journal of materials chemistry. Volume 8:Issue 23(2020)
• Page Start: 11800
• Page End: 11810
• Publication Date: 2020-06-05
• Subjects: Materials -- Research -- Periodicals; Chemistry, Analytic -- Periodicals; Environmental sciences -- Research -- Periodicals; 543.0284
• DOI: 10.1039/d0ta03204b
• Languages: English
• ISSNs: 2050-7488

Abstract

Abstract : V2 O5 electronic band structure from cathodoluminescence reveals how lithiation creates octahedral distortion and not oxygen vacancies or conversion reactions. Abstract : Vanadium pentoxide (V2 O5 ) is a very well-known cathode material that has attracted considerable interest for its potential use in solid-state lithium-ion batteries. We pioneer the use of depth-resolved cathodoluminescence spectroscopy (DRCLS) to monitor the changes in the electronic structure of lithiated V2 O5 from the free surface to the thin film bulk several hundred nm below as a function of lithiation. DRCLS measurements of V2 O5 interband transitions are in excellent agreement with density functional theory (DFT) calculations. The direct measure of V2 O5 's electronic band structure as a function of lithiation level provided by DRCLS can help inform solid-state battery designs to further withstand degradation and increase efficiency. In particular, these unique electrode measurements may reveal physical mechanisms of lithiation that change V2 O5 irreversibly, as well as methods to mitigate them in solid-state batteries.