Effect of cobalt substitution on cationic distribution in LiNi1 − y CoyO2 electrode materials

✍ Scribed by A. Rougier; I. Saadoune; P. Gravereau; P. Willmann; C. Delmasa

• Book ID: 104296291
• Publisher: Elsevier Science
• Year: 1996
• Tongue: English
• Weight: 629 KB
• Volume: 90
• Category: Article
• ISSN: 0167-2738
• DOI: 10.1016/s0167-2738(96)00370-0

✦ Synopsis

A crystal chemistry study of LiNi, _,Co,O, phases, used as positive electrode in lithium batteries, is presented. These materials crystallize in the rhombohedral system (space group: R3m) with a layered structure. Rietveld profile refinement of the X-ray data shows that for low substitution amounts (y 5 0.20) extra-nickel ions are always present leading to the Li,_ZNi ,+z_-rC~,OZ (t = y(1 + z)) formula (z >O), while for y 20.30, a pure 2D structure is obtained (z = 0). The stabilization of the 2D character of the structure by cobalt substitution in lithium nickelate leads to the improvement of the electrochemical properties.