Investigating the electrode kinetics of the Li/Li+ Couple in a wide range of room temperature ionic liquids at 298 K

Rahmat Wibowo, Sarah E.Ward Jones, Richard G. Compton

Research output: Contribution to journalArticlepeer-review

24 Citations (Scopus)

Abstract

Cyclic voltammetry experiments are carried out using a 0.1 M Li+ solution in 12 different room temperature ionic liquids (RTILs), [C 4mpyrr][NTf2], [C4dmim][NTf2], [N2,1,1,3][NTf2], [N6,2,2,2][NTf2], [C4mim][OTf], [C4mpyrr][N(CN)2], [C 2mim][NTf2], [P14,6,6,6][FAP], [C 4py][NTf2], [C4mim][PF6], [C 4mim][NTf2], and [N1,8,8,8][OTf], on a Ni microelectrode to investigate the deposition and stripping of lithium from the electrode surface. [C4mpyrr][N(CN)2], [C 2mim][NTf2], [P14,6,6,6][FAP], [C 4py][NTf2], [C4mim][PF6], [C 4mim][NTf2], and [N1,8,8,8][OTf] did not have a wide enough potential window to observe the deposition and stripping of bulk lithium. In the experimental data recorded for [C4mpyrr][NTf 2], [C4dmim][NTf2], [N2,1,1,3] [NTf2], [N6,2,2,2][NTf2], and [C 4mim][OTf], a single stripping peak for bulk lithium is seen, and kinetic data for the Li/Li+ couple are extracted by comparison with computational simulations. The electrochemical rate constant, k0, is found to have values ranging from (1.3 · 10-6 to 1.2 · 10-5) cm· s-1. Diffusion coefficients for the Li+ ion in these five RTILs are also reported.

Original languageEnglish
Pages (from-to)1374-1376
Number of pages3
JournalJournal of Chemical and Engineering Data
Volume55
Issue number3
DOIs
Publication statusPublished - 11 Mar 2010

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