Please use this identifier to cite or link to this item:
https://doi.org/10.1016/j.electacta.2004.12.011
DC Field | Value | |
---|---|---|
dc.title | Cathodic behaviour of NiO-coated Li(Ni1/2Mn1/2)O 2 | |
dc.contributor.author | Reddy, M.V. | |
dc.contributor.author | Rao, G.V.S. | |
dc.contributor.author | Chowdari, B.V.R. | |
dc.date.accessioned | 2014-10-16T09:17:33Z | |
dc.date.available | 2014-10-16T09:17:33Z | |
dc.date.issued | 2005-05-30 | |
dc.identifier.citation | Reddy, 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.issn | 00134686 | |
dc.identifier.uri | http://scholarbank.nus.edu.sg/handle/10635/95935 | |
dc.description.abstract | The 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.uri | http://libproxy1.nus.edu.sg/login?url=http://dx.doi.org/10.1016/j.electacta.2004.12.011 | |
dc.source | Scopus | |
dc.subject | Cathode material: Li-ion batteries | |
dc.subject | Li(Ni1/2Mn1/2)O2 | |
dc.subject | NiO coating | |
dc.type | Article | |
dc.contributor.department | PHYSICS | |
dc.description.doi | 10.1016/j.electacta.2004.12.011 | |
dc.description.sourcetitle | Electrochimica Acta | |
dc.description.volume | 50 | |
dc.description.issue | 16-17 | |
dc.description.page | 3375-3382 | |
dc.description.coden | ELCAA | |
dc.identifier.isiut | 000229570300022 | |
Appears in Collections: | Staff Publications |
Show simple item record
Files in This Item:
There are no files associated with this item.
Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.