Please use this identifier to cite or link to this item: https://doi.org/10.1016/j.jpowsour.2004.08.044
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dc.titleEffect of AlPO4-coating on cathodic behaviour of Li(Ni 0.8Co0.2)O2
dc.contributor.authorTan, K.S.
dc.contributor.authorReddy, M.V.
dc.contributor.authorRao, G.V.S.
dc.contributor.authorChowdari, B.V.R.
dc.date.accessioned2014-10-16T09:21:43Z
dc.date.available2014-10-16T09:21:43Z
dc.date.issued2005-02-16
dc.identifier.citationTan, K.S., Reddy, M.V., Rao, G.V.S., Chowdari, B.V.R. (2005-02-16). Effect of AlPO4-coating on cathodic behaviour of Li(Ni 0.8Co0.2)O2. Journal of Power Sources 141 (1) : 129-142. ScholarBank@NUS Repository. https://doi.org/10.1016/j.jpowsour.2004.08.044
dc.identifier.issn03787753
dc.identifier.urihttp://scholarbank.nus.edu.sg/handle/10635/96290
dc.description.abstractThe cathodic behaviour and thermal stability in the charged state of bare and 1-8 wt.% AlPO4-coated layered oxide Li(Ni0.8Co 0.2)O2 are investigated. The synthesized compounds are characterized by a wide variety of techniques. X-ray diffraction analysis (XRD) shows that the hexagonal a and c lattice parameters of Li(Ni 0.8Co0.2)O2 are not affected by the AlPO 4-coating, but there are indications of an increasing number of Ni-ions occupying the Li-sites in the Li-layer with increasing amounts of the coated AlPO4. The O 1s X-ray photoelectron spectra clearly indicate two different oxygens that correspond to the coated-AlPO4 and the bare compounds. Cyclic voltammetry (2.5-4.3 V) shows that the characteristic structural phase transitions exhibited by the bare compound are suppressed by ≥5 wt.% AlPO4-coating. Galvanostatic charge-discharge cycling has been carried out at a current density of 30 mA g-1 in the range of 2.5-4.3 V up to 70 cycles and 2.5-4.5 V up to 40 cycles. Capacity-fading of the 3 and 5 wt.% AlPO4-coated Li(Ni0.8Co0.2)O 2 is much less than that shown by the bare compound, which is 21% between 10 and 70 cycles with a 4.3 V cut-off and 48% between 10 and 40 cycles with a 4.5 V cut-off. The coulombic efficiency is >98% in all cases after a few initial cycles. Impedance spectra of cells with 1 and 5 wt.% AlPO 4-coated compounds and ex situ XRD of the 3 and 5 wt.% AlPO 4-coated charged cathodes are examined and the results interpreted. Differential scanning calorimetry curves of the charged cathodes (4.3 V) reveals that the decomposition temperature of 220 °C for the bare compound is increased by ∼10 °C after 3 and 5 wt.% AlPO4-coating, and more significantly the heat evolution decreases by a factor of 5, which indicates better thermal stability. Nevertheless, this benefit comes at the expense of reversible capacities, which decrease from 202 mAh g-1 (fifth cycle, 4.3 V) for the bare compound, to 156 and 100 mAh g-1 for the 3 and 5 wt.% AlPO4-coated Li(Ni0.8Co 0.2)O2, respectively. © 2004 Elsevier B.V. All rights reserved.
dc.description.urihttp://libproxy1.nus.edu.sg/login?url=http://dx.doi.org/10.1016/j.jpowsour.2004.08.044
dc.sourceScopus
dc.subjectAlPO4-coating
dc.subjectCathode
dc.subjectLi(Ni0.8Co0.2)O2
dc.subjectLi-ion batteries
dc.subjectThermal stability
dc.typeArticle
dc.contributor.departmentPHYSICS
dc.description.doi10.1016/j.jpowsour.2004.08.044
dc.description.sourcetitleJournal of Power Sources
dc.description.volume141
dc.description.issue1
dc.description.page129-142
dc.description.codenJPSOD
dc.identifier.isiut000227046400017
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