Please use this identifier to cite or link to this item: https://doi.org/10.1016/j.electacta.2004.12.011
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dc.titleCathodic behaviour of NiO-coated Li(Ni1/2Mn1/2)O 2
dc.contributor.authorReddy, M.V.
dc.contributor.authorRao, G.V.S.
dc.contributor.authorChowdari, B.V.R.
dc.date.accessioned2014-10-16T09:17:33Z
dc.date.available2014-10-16T09:17:33Z
dc.date.issued2005-05-30
dc.identifier.citationReddy, M.V., Rao, G.V.S., Chowdari, B.V.R. (2005-05-30). Cathodic behaviour of NiO-coated Li(Ni1/2Mn1/2)O 2. Electrochimica Acta 50 (16-17) : 3375-3382. ScholarBank@NUS Repository. https://doi.org/10.1016/j.electacta.2004.12.011
dc.identifier.issn00134686
dc.identifier.urihttp://scholarbank.nus.edu.sg/handle/10635/95935
dc.description.abstractThe compound, Li(Ni1/2Mn1/2)O2 was prepared by the mixed hydroxide method at 950 °C in air. It was coated with 3 and 6 wt.% NiO by the solution method and heat treated at 450 °C in air. The compounds were characterized by X-ray diffraction, SEM, TEM, BET surface area and density. Cyclic voltammmetry of the bare and NiO-coated compounds showed redox processes at 3.69-3.95 V corresponding to the couple Ni 2+/3+/4+. Galvanostatic charge-discharge cycling was carried out at 30 mA g-1 up to 70 cycles in the voltage ranges, 2.5-4.3 and 2.5-4.5 V versus Li at room temperature. The 10th cycle discharge capacities for the bare and NiO-coated compounds are 140 ± 3 mAh g-1 which are stable up to 20-30 cycles after which capacity-fading occurs. The 6% NiO-coated compound performs better with only 11% capacity loss at the 70th cycle. In the range 2.5-4.5 V, the third cycle capacities are 175 ± 5 mAh g -1 for the bare and 3% NiO-coated compounds, but capacity-fading starts from fifth cycle onwards. The 6% NiO-coated Li(Ni1/2Mn 1/2)O2 showed a stable discharge capacity of 165 ± 3 mAh g-1 during 3-30 cycles after which it degraded, by ∼9%, at the 70th cycle. Thus, NiO-coating suppresses capacity-fading but not eliminates it in Li(Ni1/2Mn1/2)O2. The coulombic efficiency in all cases was >98%. DSC on the cathodes in the charged-state (4.3 V) show that the exothermic decomposition for the bare and 6% NiO-compound occurs at 300 and 307 (±2) °C, respectively. © Published by Elsevier Ltd.
dc.description.urihttp://libproxy1.nus.edu.sg/login?url=http://dx.doi.org/10.1016/j.electacta.2004.12.011
dc.sourceScopus
dc.subjectCathode material: Li-ion batteries
dc.subjectLi(Ni1/2Mn1/2)O2
dc.subjectNiO coating
dc.typeArticle
dc.contributor.departmentPHYSICS
dc.description.doi10.1016/j.electacta.2004.12.011
dc.description.sourcetitleElectrochimica Acta
dc.description.volume50
dc.description.issue16-17
dc.description.page3375-3382
dc.description.codenELCAA
dc.identifier.isiut000229570300022
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