Study of the structural and thermal stability of Li0.3Co2/3Ni1/6Mn1/6O2

[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

Publication date :

2014

Journal title :

Electrochimica Acta

ISSN :

0013-4686

Publisher :

Pergamon Press - An Imprint of Elsevier Science

Volume :

135

Pages :

536 - 542

Peer reviewed :

Peer Reviewed verified by ORBi

Additional URL :

http://www.sciencedirect.com/science/article/pii/S0013468614010421

Available on ORBi :

since 15 January 2018

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