Journal
JOURNAL OF MATERIALS SCIENCE
Volume 56, Issue 13, Pages 8127-8142Publisher
SPRINGER
DOI: 10.1007/s10853-021-05805-5
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Funding
- Natural Science Foundation of Anhui Province [2008085ME125]
- Open Fund Project of Key Laboratory of Metallurgical Emission Reduction & Resources Recycling (Anhui University of Technology), Ministry of Education [JKF20-6]
- National Natural Science Foundation of China [51971001]
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Transition-metal-based high-entropy oxides, prepared through solution combustion synthesis with high concentration of oxygen vacancies, show enhanced electrochemical properties as anode materials for lithium ion batteries, attributed to improved Li+ intercalation space, structural stability, electronic conductivity, and Li+ diffusivity.
Owing to their entropy stabilization and multi-principal effect, transition-metal-based high-entropy oxides are attracting extensive attention as an effective family of anode materials for lithium ion batteries (LIBs). Herein, spinel-type (Al0.2CoCrFeMnNi)(0.58)O4-delta HEO nanocrystalline powder with high concentration of oxygen vacancies is successfully prepared by the method of solution combustion synthesis (SCS), and explored as a novel anode active material for LIBs. As compared to (CoCrFeMnNi)(0.6)O4-delta, the inactive Al3+-doped (Al0.2CoCrFeMnNi)(0.58)O4-delta anode provides more than twice the reversible specific capacity of 554 mAh g(-1) after 500 cycles at a specific current of 200 mA g(-1), accompanied with good rate capability (634 mAh g(-1) even at 3 A g(-1)) and cycling performance. The enhanced electrochemical properties can be attributed to that inactive Al3+-doping resulted into the more space for Li+ intercalation and deintercalation, enhanced structural stability, and the improved electronic conductivity and Li+ diffusivity. [GRAPHICS] .
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