A study of the electrochemical lithium intercalation behavior of porous LiNiO2 electrodes prepared by solid-state reaction and sol–gel methods
| Autor: | Seong-In Moon, Yoo-Eup Hyung, Su-Il Pyun, Young-Min Choi |
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| Rok vydání: | 1998 |
| Předmět: |
Renewable Energy
Sustainability and the Environment Chemistry Inorganic chemistry Oxide Energy Engineering and Power Technology Electrolyte Thermal diffusivity Electrochemistry Dielectric spectroscopy chemistry.chemical_compound Phase (matter) Electrode Electrical and Electronic Engineering Physical and Theoretical Chemistry Sol-gel |
| Zdroj: | Journal of Power Sources. 72:83-90 |
| ISSN: | 0378-7753 |
| DOI: | 10.1016/s0378-7753(97)02677-3 |
| Popis: | The electrochemical lithium intercalation behavior of porous LiNiO 2 electrodes prepared by solid-state reaction and sol–gel methods is investigated by using X-ray diffractometry (XRD), a galvanostatic intermittent charge–discharge experiment, electrochemical impedance spectroscopy(EIS), and a charge–discharge cycling test. The ultrafine LiNiO 2 powder is prepared by the sol–gel method in order to overcome the disadvantage of the conventional solid-state reaction method. From the results of XRD, the layered LiNiO 2 phase proves to be stable above 400°C. The conventional oxide electrode suffers a larger capacity loss, a greater instantaneous IR drop during the first intermittent discharge, and a smaller chemical diffusivity than the gel-derived electrode. The results are discussed with respect to the marked cation mixing effect in the former electrode. Furthermore, the charge–discharge cycling test shows that the cell Li/organic electrolyte/gel-derived LiNiO 2 electrode displays improved performance, i.e., an initial specific capacity of 150 Ah kg −1 and a specific energy density above 500 Wh kg −1 . |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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