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Disordered spinel LiNi0.5Mn1.5O4 cathode with improved rate performance for lithium-ion batteries
journal contribution
posted on 2016-07-10, 00:00 authored by N D Rosedhi, N H Idris, Md Mokhlesur RahmanMd Mokhlesur Rahman, M F M Din, J WangThe high voltage LiNi0.5Mn1.5O4 cathode with a disordered spinel structure is synthesized by a glycine-assisted low-temperature reaction follows by a thermal treatment at 750 °C, 850 °C, and 950 °C for 12 h. Glycine is used as a chelating agent for the first time to build required environment for shaping the precursor of LiNi0.5Mn1.5O4 materials. The microstructure and morphology of the LiNi0.5Mn1.5O4 product are characterized by X-ray diffraction, X-ray photoelectron spectroscopy, scanning electron microscopy, Brunauer-Emmett-Teller, and transmission electron microscopy. The sample prepares at 750 °C reveals small particles with well-defined crystals as confirmed by electron microscopy. Electrochemical results demonstrate that LiNi0.5Mn1.5O4 electrode anneal at 750 °C (compare to other two samples) delivers the highest reversible capacity of 110 mAh g-1 at 0.2C after 100 cycles with good rate capability. The enhanced electrochemical performance could be attributed to the smaller particle sizes as well as well-defined crystals which provide a directional and shorter diffusion path length for Li+ transportation within the crystals.
History
Journal
Electrochimica actaVolume
206Pagination
374 - 380Publisher
ElsevierLocation
Amsterdam, The NetherlandsPublisher DOI
ISSN
0013-4686Language
engPublication classification
C Journal article; C1 Refereed article in a scholarly journalCopyright notice
2016, ElsevierUsage metrics
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