Porous spinel-type (Al0.2CoCrFeMnNi)0.58O4-δ high-entropy oxide as a novel high-performance anode material for lithium-ion batteries


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)0.58O4-δ 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)0.6O4-δ, the inactive Al3+-doped (Al0.2CoCrFeMnNi)0.58O4-δ 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.

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This work was supported by Natural Science Foundation of Anhui Province (Grant No. 2008085ME125), the Open Fund Project of Key Laboratory of Metallurgical Emission Reduction & Resources Recycling (Anhui University of Technology), Ministry of Education (Grant No. JKF20-6), and National Natural Science Foundation of China (Grant No. 51971001).

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Correspondence to Aiqin Mao or Cui-Hong Zheng.

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Xiang, HZ., Xie, HX., Chen, YX. et al. Porous spinel-type (Al0.2CoCrFeMnNi)0.58O4-δ high-entropy oxide as a novel high-performance anode material for lithium-ion batteries. J Mater Sci 56, 8127–8142 (2021). https://doi.org/10.1007/s10853-021-05805-5

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