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Electrochemical Performance of (MgCoNiZn)1–x Li x O High-Entropy Oxides in Lithium-Ion Batteries

Lökçü, Ersu ; Toparli, Çiğdem ; Anik, Mustafa

ACS applied materials & interfaces, 2020-05, Vol.12 (21), p.23860-23866 [Periódico revisado por pares]

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Título:
Electrochemical Performance of (MgCoNiZn)1–x Li x O High-Entropy Oxides in Lithium-Ion Batteries
Autor: Lökçü, Ersu ; Toparli, Çiğdem ; Anik, Mustafa
É parte de: ACS applied materials & interfaces, 2020-05, Vol.12 (21), p.23860-23866
Descrição: High-entropy oxides (HEOs), which are a new class of single-phase solid solution materials, have recently attracted significant attention as an anode material for lithium-ion batteries (LIBs). In this study, (MgCoNiZn)1–x Li x O (x = 0.05, 0.15, 0.25, and 0.35) HEOs were synthesized and their electrochemical performances as the anode material were observed in LIBs. X-ray photoelectron spectroscopy (XPS) analysis showed that the increase in the lithium cation concentration causes generation of more oxygen vacancies, which greatly affected the electrochemical performance of (MgCoNiZn)1–x Li x O HEO anodes, in the structure. The more the oxygen vacancy concentration in the anode, the higher the discharge capacity in the LIB. The (MgCoNiZn)0.65Li0.35O anode had 1930 mA h g–1 initial and 610 mA h g–1 stable (after 130 cycles) discharge capacities at a current density of 1000 mA g–1. This work clearly indicated that designing a HEO with abundant oxygen vacancies in the structure was a very efficient strategy to improve the electrochemical performance of the HEO electrode for LIBs.
Editor: United States: American Chemical Society
Idioma: Inglês

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