Owing to their entropy stabilization and multi-principal effect, transition-metalbased high-entropy oxides are attracting extensive attention as an effective family of anode materials for lithium ion batteries (LIBs). Herein, spinel-type (Al 0.2 CoCrFeMnNi) 0.58 O 4-d 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 O 4-d , the inactive Al 3? -doped (Al 0.2-CoCrFeMnNi) 0.58 O 4-d 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 Al 3? -doping resulted into the more space for Li ? intercalation and deintercalation, enhanced structural stability, and the improved electronic conductivity and Li ? diffusivity.
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