| Autor: |
Shevtsov A; Center for Energy Science and Technology, Skolkovo Institute of Science and Technology, Nobel str. 3, 143026 Moscow, Russia.; Department of Chemistry, Lomonosov Moscow State University, 119991 Moscow, Russia., Han H; Department of Chemistry, University at Albany, Albany, NY 12222, USA.; Department of Materials Science and Engineering, Cornell University, Ithaca, NY 14850, USA., Morozov A; Center for Energy Science and Technology, Skolkovo Institute of Science and Technology, Nobel str. 3, 143026 Moscow, Russia.; Department of Chemistry, Lomonosov Moscow State University, 119991 Moscow, Russia., Carozza JC; Department of Chemistry, University at Albany, Albany, NY 12222, USA., Savina AA; Center for Energy Science and Technology, Skolkovo Institute of Science and Technology, Nobel str. 3, 143026 Moscow, Russia., Shakhova I; Center for Energy Science and Technology, Skolkovo Institute of Science and Technology, Nobel str. 3, 143026 Moscow, Russia., Khasanova NR; Department of Chemistry, Lomonosov Moscow State University, 119991 Moscow, Russia., Antipov EV; Center for Energy Science and Technology, Skolkovo Institute of Science and Technology, Nobel str. 3, 143026 Moscow, Russia.; Department of Chemistry, Lomonosov Moscow State University, 119991 Moscow, Russia., Dikarev EV; Department of Chemistry, University at Albany, Albany, NY 12222, USA., Abakumov AM; Center for Energy Science and Technology, Skolkovo Institute of Science and Technology, Nobel str. 3, 143026 Moscow, Russia. |
| Abstrakt: |
The Li 1.17 Ni 0.17 Mn 0.50 Co 0.17 O 2 Li-rich NMC positive electrode (cathode) for lithium-ion batteries has been coated with nanocrystals of the LiMn 1.5 Co 0.5 O 4 high-voltage spinel cathode material. The coating was applied through a single-source precursor approach by a deposition of the molecular precursor LiMn 1.5 Co 0.5 (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 SiO 2 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 -1 . The coating also improves the capacity and voltage retention monitored over 25 galvanostatic charge-discharge cycles, although a complete suppression of the capacity and voltage fade is not achieved. |
