Malonic acid-assisted synthesis of LiNi0.8Co0.2O2 cathode active material for lithium-ion batteries
| Autor: | T. Prem Kumar, G. Ting-Kuo Fey, Zhi-Feng Wang |
|---|---|
| Rok vydání: | 2002 |
| Předmět: |
Aqueous solution
Coordination sphere General Chemical Engineering Inorganic chemistry General Engineering General Physics and Astronomy chemistry.chemical_element Malonic acid Electrochemistry Cathode law.invention Solvent chemistry.chemical_compound chemistry law General Materials Science Calcination Lithium |
| Zdroj: | Ionics. 8:351-359 |
| ISSN: | 1862-0760 0947-7047 |
| DOI: | 10.1007/bf02376048 |
| Popis: | Polycrystalline LiNi0.8Co0.2O2 was synthesized by a solution route with malonic acid as the complexing agent. The effects of temperature, duration of heat treatment, pH of the precursor solution, and the nature of the solvent employed on the performance characteristics of the product were studied. It was observed that a 12-hour 800 °C heat treatment protocol was necessary to obtain products with optimal electrochemical characteristics. Furthermore, an excess lithium stoichiometry of 1.05 was found to be detrimental to the performance of the cathode material. The beneficial effect of ethanol as a solvent over water on the product characteristics is explained by the presence of solvent molecules in the coordination sphere of the cations. A pH of 7, at which malonic acid is complexed completely with the cations without interference from other nucleophiles, was found to be ideal for the synthesis of the cathode active material from aqueous solutions. With ethanol as the medium, the product formed by a 12-h calcination at 800 °C yielded a first-cycle capacity of 173 mAh/g and a tenth-cycle capacity of 169 mAh/g. |
| Databáze: | OpenAIRE |
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