Please use this identifier to cite or link to this item: https://doi.org/10.1149/1.1521754
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dc.titleElectrochemical kinetic studies of Li-ion in O2-structured Li2/3(Ni1/3Mn2/3)O2 and Li(2/3)+x(Ni1/3Mn2/3)O2 by EIS and GITT
dc.contributor.authorShaju, K.M.
dc.contributor.authorSubba Rao, G.V.
dc.contributor.authorChowdari, B.V.R.
dc.date.accessioned2014-10-16T09:23:02Z
dc.date.available2014-10-16T09:23:02Z
dc.date.issued2003-01
dc.identifier.citationShaju, K.M., Subba Rao, G.V., Chowdari, B.V.R. (2003-01). Electrochemical kinetic studies of Li-ion in O2-structured Li2/3(Ni1/3Mn2/3)O2 and Li(2/3)+x(Ni1/3Mn2/3)O2 by EIS and GITT. Journal of the Electrochemical Society 150 (1) : A1-A13. ScholarBank@NUS Repository. https://doi.org/10.1149/1.1521754
dc.identifier.issn00134651
dc.identifier.urihttp://scholarbank.nus.edu.sg/handle/10635/96403
dc.description.abstractThe kinetics of Li-ion interaction into O2 structure layered nickel-manganese oxides, Li2/3(Ni1/3Mn2/3)O2 [O2 (Li)] and Li(2/3)+x(Ni2/3Mn2/3)O2, x = 1/3 [O2 (Li + x)] were determined by electrochemical impedance spectroscopy (EIS) and galvanostatic intermittent titration technique (GITT) in conjunction with other electrochemical techniques. Modeling the EIS data with equivalent circuit approach enabled the determination of charge transfer, bulk, and surface film resistances. The formation and nature of surface film is shown to be signature for the cell performance which in turn affects the kinetics of electrode processes. The improved cycling performance of O2 (Li + x) is shown to be due to the better electrode kinetics and the formation of stable surface film. The Li-ion diffusion coefficient (DLi) was determined at different cell potentials by GITT on O2 (Li) and O2 (Li + x) and analyzing the Warburg region of the impedance plots of O2 (Li + x). The DLi values are in the range 1.0 × 10-11 to 10-10 cm2/s for both the compounds in the entire composition (voltage) range. The DLi (GITT) values are lower by a factor of two as compared for those obtained from EIS in the entire voltage range for O2 (Li + x). The irreversible phase change from the T2 to O2 structure observed during the first charging in these compounds, is reflected as minima in the DLi vs. voltage plots in the vicinity of the cyclic voltammetric peaks.
dc.description.urihttp://libproxy1.nus.edu.sg/login?url=http://dx.doi.org/10.1149/1.1521754
dc.sourceScopus
dc.typeArticle
dc.contributor.departmentPHYSICS
dc.description.doi10.1149/1.1521754
dc.description.sourcetitleJournal of the Electrochemical Society
dc.description.volume150
dc.description.issue1
dc.description.pageA1-A13
dc.description.codenJESOA
dc.identifier.isiut000180069000002
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