Electron diffraction study of the layered Liy(Ni0.425Mn0.425Co0.15)0.88O2 materials reintercalated after two different states of charge

François Weill (1, 2) , Nicolas Tran (1) , Nelly Martin (1) , Laurence Croguennec (1) , Claude Delmas (1)

1 ICMCB - Institut de Chimie de la Matière Condensée de Bordeaux
2 Centre de Ressources en Microscopie Electronique et Microanalyse

A long and irreversible plateau is observed for Li1.12(Ni0.425Mn0.425Co0.15)0.88O2. The layered Liy(Ni0.425Mn0.425Co0.15)0.88O2 (y=0.93 and 0.73) materials were prepared by discharging to 3.2 V Li//Liy(Ni0.425Mn0.425Co0.15)0.88O2 cells charged up to 4.4 V (beginning of the plateau) and 4.8 V (end of the plateau), respectively. The structure was investigated using the combination of X-ray and electron diffraction experiments to study a possible structural evolution upon cycling of the superstructure observed for the pristine material. The disappearance of the superlattice lines in the 19.5–34° (2fCu) range in the X-ray diffraction pattern as well as that of the diffuse disorder scattering lines (or the extra spots) in the electron diffraction patterns were clearly observed for Li0.73(Ni0.425Mn0.425Co0.15)0.88O2...

Mots clés: Layered oxides; Cation ordering; X-ray diffraction; Electron diffraction; Lithium-ion battery

Domaines: Matériaux

François Weill, Nicolas Tran, Nelly Martin, Laurence Croguennec, Claude Delmas. Electron diffraction study of the layered Liy(Ni0.425Mn0.425Co0.15)0.88O2 materials reintercalated after two different states of charge. Electrochemical and Solid-State Letters, 2007, 10 (8), pp.A194-A197. ⟨10.1149/1.2746516⟩. ⟨hal-00180349⟩