Energy Storage; Lithium-ion batteries ;Battery safety; Cathode material; Layered LiCoNiMnO
Abstract :
[en] Abstract Thermal and structural stabilities of the delithiated positive electrode material LixCo2/3Ni1/6Mn1/6O2were 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-3m) 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 Ni2+ ions were present in the lithium slab even after the lithium extraction process. For the thermal stability, the highly oxidized phase Li0.3Co2/3Ni1/6Mn1/6O2 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 LiCo2/3Ni1/6Mn1/6O2clearly showits ability to compete with the commercialized cathode materials
Disciplines :
Chemistry
Author, co-author :
Mahmoud, Abdelfattah ; Université de Liège - ULiège > Département de chimie (sciences) > LCIS - GreenMAT
Saadoune, Ismael
Difi, Siham
Sougrati, Moulay Tahar
Lippens, Pierre-Emmanuel
Amarilla, José Manuel
Language :
English
Title :
Study of the structural and thermal stability of Li0.3Co2/3Ni1/6Mn1/6O2
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