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Title

Study of the structural and thermal stability of Li0.3Co 2/3Ni1/6Mn1/6O2

AuthorsMahmoud, Abdelfattah; Saadoune, Ismael; Difi, Siham; Sougrati, Moulay Tahar; Lippens, Pierre-Emmanuel; Amarilla, José Manuel
KeywordsLayered LiCo2/3Ni1/6Mn1/6O2
Battery safety
Cathode material
Lithium-ion batteries
Energy storage
Issue Date20-Jul-2014
PublisherElsevier
CitationElectrochimica Acta 135: 536-542 (2014)
AbstractThermal and structural stabilities of the delithiated positive electrode material LixCo2/3Ni1/6Mn1/6O 2were studied by X-ray diffraction, magnetic and thermogravimetric analysis. In the opposite to the classical electrode materials LiNiO2 and LiCoO2, the structural symmetry (S.G. R-3 m) of the starting material LiCo2/3Ni1/6Mn1/6O2 is preserved during the electrochemical cycling with a small variation of the unit cell parameters. Squid measurements evidenced that practically no Ni 2+ ions were present in the lithium slab even after the lithium extraction process. For the thermal stability, the highly oxidized phase Li 0.3Co2/3Ni1/6Mn1/6O2 was tested. This delithiated phase undergoes only 5.16% weight loss after heating up to 600 °C. This weight loss has no effect on the structure symmetry as the starting α-NaFeO2 type structure was preserved during the thermal treatment. The obtained results coupled to the excellent electrochemical features of LiCo2/3Ni1/6Mn1/6O 2clearly showits ability to compete with the commercialized cathode materials.
Publisher version (URL)https://doi.org/10.1016/j.electacta.2014.05.058
URIhttp://hdl.handle.net/10261/181907
Identifiersdoi: 10.1016/j.electacta.2014.05.058
issn: 0013-4686
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