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Protective Spinel Coating for Li1.17Ni0.17Mn0.50Co0.17O2 Cathode for Li-Ion Batteries through Single-Source Precursor Approach.

ABSTRACT: 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-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.

SUBMITTER: Shevtsov A 

PROVIDER: S-EPMC7558323 | biostudies-literature | 2020 Sep

REPOSITORIES: biostudies-literature

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Protective Spinel Coating for Li<sub>1.17</sub>Ni<sub>0.17</sub>Mn<sub>0.50</sub>Co<sub>0.17</sub>O<sub>2</sub> Cathode for Li-Ion Batteries through Single-Source Precursor Approach.

Shevtsov Andrey A   Han Haixiang H   Morozov Anatolii A   Carozza Jesse C JC   Savina Aleksandra A AA   Shakhova Iaroslava I   Khasanova Nellie R NR   Antipov Evgeny V EV   Dikarev Evgeny V EV   Abakumov Artem M AM  

Nanomaterials (Basel, Switzerland) 20200918 9

The Li<sub>1.17</sub>Ni<sub>0.17</sub>Mn<sub>0.50</sub>Co<sub>0.17</sub>O<sub>2</sub> Li-rich NMC positive electrode (cathode) for lithium-ion batteries has been coated with nanocrystals of the LiMn<sub>1.5</sub>Co<sub>0.5</sub>O<sub>4</sub> high-voltage spinel cathode material. The coating was applied through a single-source precursor approach by a deposition of the molecular precursor LiMn<sub>1.5</sub>Co<sub>0.5</sub>(thd)<sub>5</sub> (thd = 2,2,6,6-tetramethyl-3,5-heptanedionate) dissolved i  ...[more]

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