Electrochemical Performance of (MgCoNiZn)1-xLixO High-Entropy Oxides in Lithium-Ion Batteries

被引:136
作者
Lokcu, Ersu [1 ]
Toparli, Cigdem [2 ]
Anik, Mustafa [1 ]
机构
[1] Eskisehir Osmangazi Univ, Dept Met & Mat Engn, TR-26040 Eskisehir, Turkey
[2] MIT, Dept Nucl Sci & Engn, 77 Massachusetts Ave, Cambridge, MA 02139 USA
关键词
high-entropy oxides; conversion-type anode; Li-ion battery; oxygen vacancies; charge compensation; NANOSTRUCTURED ANODE MATERIALS; OF-THE-ART; STORAGE; DESIGN; CO3O4;
D O I
10.1021/acsami.0c03562
中图分类号
TB3 [工程材料学];
学科分类号
0805 ; 080502 ;
摘要
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)LixO (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)LixO HEO anodes, in the structure. The more the oxygen vacancy concentration in the anode, the higher the discharge capacity in the LIB. The (MgCoNiZn)(0.65)Li0.35O 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.
引用
收藏
页码:23860 / 23866
页数:7
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