Effect of Superhalogen Anions on the Electrochemical Behavior of V2O5 Electrodes in Redox Reactions with Lithium in EC-DMC/Li-Salt Solutions. (18th November 2019)

• Record Type: Journal Article
• Authors: Apostolova, Raisa; Markovsky, Boris; Aurbach, Doron; Shembel, Elena
• Is Part Of: ECS transactions. Volume 95:Number 1(2019)
• Page Start: 183
• Page End: 200
• Publication Date: 2019-11-18
• Subjects: Electrochemistry -- Periodicals; Electrochemistry; Periodicals; Electronic journals; Electronic journal; 541.37
• DOI: 10.1149/09501.0183ecst
• Languages: English
• ISSNs: 1938-5862

Abstract

Abstract : It was established that the number of active sites for the insertion/extraction of lithium ions in/from the V2 O5 structure in EC-DMC/Li-salt solutions depends on superhalogen anion. Unstable sites and their dependence on superhalogen anion (PF6 –, AsF6 –, ClO4 – ) are identified during discharge-charge cycling of V2 O5 electrodes. The number of open sites in V2 O5 depends on the structure stability and conductivity of V2 O5 . To increase the structure stability in phase transitions, we propose the electrochemical doping of V2 O5 by Mn 2+ . We propose that the conductivity and rate characteristics of V2 O5 could be increased by its co-deposition with conducting polymer of polyaniline type. Using theoretical calculation simulations assumptions have been made regarding the difference in the solvation of lithium ions in an EC/DMC mixture with different ratios of the solvents.