Role of the composition of lithium-rich layered oxide materials on the voltage decay
| Autor: | Pierre Feydi, Loïc Simonin, Frédéric Fabre, Mohamed Chakir, Jean-François Colin, Justin Bouvet, David Peralta, Sébastien Patoux, Marlène Chapuis, Adrien Boulineau |
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| Rok vydání: | 2015 |
| Předmět: |
Materials science
Renewable Energy Sustainability and the Environment Coprecipitation Analytical chemistry Oxide Energy Engineering and Power Technology chemistry.chemical_element High voltage Electrochemistry Cathode law.invention chemistry.chemical_compound Partial charge chemistry Chemical engineering law Lithium Electrical and Electronic Engineering Physical and Theoretical Chemistry Voltage |
| Zdroj: | Journal of Power Sources. 280:687-694 |
| ISSN: | 0378-7753 |
| DOI: | 10.1016/j.jpowsour.2015.01.146 |
| Popis: | Lithium-rich layered oxide is known to be one of the most promising positive electrode materials for high energy Li-ion batteries. Some publications report specific capacities higher than 250 mAh/g but the fade of the average potential during electrochemical cycling is an important drawback for commercial use of this material. The objective of this work is to study the origin of this potential decay during cycling of lithium-rich compounds. For this purpose, the electrochemical behavior of xLi 2 MnO 3 ·(1−x)LiNi 0.5 Mn 0.5 O 2 (with x = 1, 0.7, 0.5, 0.27) materials synthesized using coprecipitation route have been compared. For this study, complete or partial charge and discharge cycles have been performed in the 2.5 V–4.8 V voltage range. The results can be briefly summarized as follows: the potential decay is mainly provoked by several phenomena occurring at low potential, this growth being induced by the charging of lithium-rich at high voltage (>4.15 V). Whatever the compositions, same phenomena are involved, only the kinetics is modified. |
| Databáze: | OpenAIRE |
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