Low‐Temperature Synthesis of LiNiO2 : Reaction Mechanism, Stability, and Electrochemical Properties
| Autor: | Maria Rosa Palacín, N. Sac‐Epée, Dominique Larcher, Glenn G. Amatucci, A. Audemer, J. M. Tarascon |
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| Rok vydání: | 1997 |
| Předmět: |
Degree (graph theory)
Renewable Energy Sustainability and the Environment Chemistry Analytical chemistry Order (ring theory) Infrared spectroscopy Condensed Matter Physics Electrochemistry Surfaces Coatings and Films Electronic Optical and Magnetic Materials Phase (matter) X-ray crystallography Materials Chemistry Hydrothermal synthesis Thermal analysis |
| Zdroj: | Journal of The Electrochemical Society. 144:4226-4236 |
| ISSN: | 1945-7111 0013-4651 |
| DOI: | 10.1149/1.1838171 |
| Popis: | A thorough study was made concerning the formation of LiNiO{sub 2} by a low-temperature ion-exchange reaction under hydrothermal conditions. LiNiO{sub 2} with a low degree of cationic mixing and good electrochemical performance was prepared either from pure {beta}-NiOOH, {gamma}-NiOOH, or a mixture of both where the {gamma} phase was the majority. The synthesized product (LT-LiNiO{sub 2}) presents electrochemical properties similar to LiNiO{sub 2} prepared by conventional powder synthesis (HT-LiNiO{sub 2}) in spite of the difference in Brunauer, Emmett, and Teller (BET) surfaces, around 20 m{sup 2}/g for LT-LiNiO{sub 2} and 0.7 m{sup 2}/g for HT-LiNiO{sub 2}. This moisture instability was found (1) to be intrinsic to LiNiO{sub 2}, since ground HT-LiNiO{sub 2} samples presented a similar behavior, (2) to be enhanced by decreasing the LiNiO{sub 2} particle size, and (3) to be much larger than that of LiCoO{sub 2}. In view of electrochemical applications, cobalt-substituted products should be used in order to ensure the stability against both reduction-delithiation and hydrolysis. |
| Databáze: | OpenAIRE |
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