Protective Spinel Coating for Li1.17Ni0.17Mn0.50Co0.17O2 Cathode for Li-Ion Batteries through Single-Source Precursor Approach
| Autor: | Anatolii V. Morozov, Nellie R. Khasanova, Andrey Shevtsov, Jesse C. Carozza, Iaroslava Shakhova, Artem M. Abakumov, Haixiang Han, Evgeny V. Dikarev, Aleksandra A. Savina, Evgeny V. Antipov |
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| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
Materials science
cathode for Li-ion battery protective layer General Chemical Engineering Thermal decomposition Spinel Li-rich NMC core–shell engineering.material Article Cathode law.invention lcsh:Chemistry Coating Chemical engineering Electron diffraction lcsh:QD1-999 law Scanning transmission electron microscopy engineering capacity fade General Materials Science Crystallite voltage fade Faraday efficiency |
| Zdroj: | Nanomaterials, Vol 10, Iss 1870, p 1870 (2020) Nanomaterials Volume 10 Issue 9 |
| ISSN: | 2079-4991 |
| Popis: | The Li1.17Ni0.17Mn0.50Co0.17O2 Li-rich NMC positive electrode (cathode) for lithium-ion batteries has been coated with nanocrystals of the LiMn1.5Co0.5O4 high-voltage spinel cathode material. The coating was applied through a single-source precursor approach by a deposition of the molecular precursor LiMn1.5Co0.5(thd)5 (thd = 2,2,6,6-tetramethyl-3,5-heptanedionate) dissolved in diethyl ether, followed by thermal decomposition at 400 ° C inair resulting in a chemically homogeneous cubic spinel. The structure and chemical composition of the coatings, deposited on the model SiO2 spheres and Li-rich NMC crystallites, were analyzed using powder X-ray diffraction, electron diffraction, high angle annular dark-field scanning transmission electron microscopy (HAADF-STEM), and energy-dispersive X-ray (EDX) mapping. The coated material containing 12 wt.% of spinel demonstrates a significantly improved first cycle Coulombic efficiency of 92% with a high first cycle discharge capacity of 290 mAhg&minus 1. The coating also improves the capacity and voltage retention monitored over 25 galvanostatic charge&ndash discharge cycles, although a complete suppression of the capacity and voltage fade is not achieved. |
| Databáze: | OpenAIRE |
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