On the LiCo2/3Ni1/6Mn1/6O2 positive electrode material

• Published in: Electrochimica acta Vol. 56; no. 11; pp. 4081 - 4086
• Main Authors: MAHMOUD, Abdelfattah, SAADOUNE, Ismael, MANUEL AMARILLA, José, HAKKOU, Rachid
• Format: Journal Article Web Resource
• Language: English
• Published: Kidlington Elsevier 15.04.2011; Pergamon Press - An Imprint of Elsevier Science
• Subjects: Applied sciences; Chemistry; Chimie; Combustion method; Direct energy conversion and energy accumulation; Electrical engineering. Electrical power engineering; Electrical power engineering; Electrochemical conversion: primary and secondary batteries, fuel cells; Exact sciences and technology; Layered oxide; LiCoNiMnO; Lithium-ion batteries; Physical, chemical, mathematical & earth Sciences; Physique, chimie, mathématiques & sciences de la terre; Scanning electron microscopy; Mn; Cobalt Oxides; Nickel Oxides; Lithium Oxides; Layered oxide; Secondary cell; Combustion; Electrode material; LiCo; Discharge; Surface structure; O; Lithium-ion batteries; Lamellar structure; Morphology; Preparation; Manganese Oxides; Lithion ion batteries; Ni; Combustion method; Specific capacity; Electrical characteristic
• ISSN: 0013-4686; 1873-3859
• DOI: 10.1016/j.electacta.2011.01.118

Abstract LiCo2/3Ni1/6Mn1/6O2 layered oxide was synthesized by the combustion method that led to a crystalline phase with good homogeneity and low particles size. The structural properties of the prepared positive electrode material were investigated by performing XRD Rietveld refinement. Practically no Li/Ni mixing was detected evidencing that the studied compound adopts almost an ideal α-NaFeO2 type structure. The Li||LiCo2/3Ni1/6Mn1/6O2 cell showed a discharge capacity of 199mAhg−1 when cycled in the 2.7–4.6V potential range while the best cycling performances were recorded when the upper cut off is fixed at 4.5V. Structural changes in LixCo2/3Ni1/6Mn1/6O2 with lithium electrochemical de-intercalation were studied using X-ray diffraction. This study clearly shows the existence of a solid solution domain in the 0.1<x<1.0 composition range while for x=0.1, a new phase appears explaining the decrease of the electrochemical performance when the cell is cycled at high upper cut off voltage.