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Effect of cobalt substitution on cationic distribution in LiNi1 − y CoyO2 electrode materials |
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| Authors: | A. Rougier I. Saadoune P. Gravereau P. Willmann C. Delmasa |
| Affiliation: | a Institut de Chimie de la Matière Condensée de Bordeaux and Ecole Nationale Supérieure de Chimie et Physique de Bordeaux, av. Dr. A. Schweitzer, 33608, Pessac cedex, France b Centre National d'Etude Spatiale (CNES), 18, av. Ed. Belin, 31055, Toulouse cedex, France |
| Abstract: | A crystal chemistry study of LiNi1 − yCoyO2 phases, used as positive electrode in lithium batteries, is presented. These materials crystallize in the rhombohedral system (space group: Rm) with a layered structure. Rietveld profile refinement of the X-ray data shows that for low substitution amounts ( ≤ 0.20) extra-nickel ions are always present leading to the Li1 − zNi1 + z − tCotO2 (t = y(1 + z)) formula (z * > 0), while for y ≥ 0.30, 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. |
| Keywords: | Subsitution effects Cationic distribution Lithium nickelate — cobalt substituted Electrode materials Crystal structure |
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