Chem. J. Chinese Universities ›› 2020, Vol. 41 ›› Issue (8): 1801.doi: 10.7503/cjcu20200263

• Physical Chemistry • Previous Articles     Next Articles

Synthesis and Electrochemical Performance of Spinel-type High-entropy Oxides

XIANG Houzheng2, XIE Hongxiang2, LI Wenchao2, LIU Xiaolei2, MAO Aiqin1,2, YU Haiyun1,2   

  1. 1. Key Laboratory of Metallurgical Emission Reduction&Resources Recycling, Ministry of Education, Anhui University of Technology, Ma'anshan 243002, China;
    2. School of Materials Science and Engineering, Key Laboratory of Green Fabrication and Surface Technology of Advanced Metal Materials, Ministry of Education, Anhui University of Technology, Ma'anshan 243002, China
  • Received:2020-05-11 Online:2020-08-10 Published:2020-07-31
  • Supported by:
    Supported by the China Postdoctoral Science Foundation(Nos.2019M652249, 2019M662229).

Abstract: The spinel-type high-entropy oxides(HEOs),(Cr0.2Fe0.2Mn0.2Ni0.2M0.2)3O4(M=Co, Zn, and Mg) nanocrystalline powders with chemical homogeneity were synthesized by solution combustion method, and explored for the first time as anode materials for lithium-ion batteries. The effects of active transition-metal ions Co, Zn and inactive Mg ion on the structural and electrochemical performance were investigated. The results show that all the synthesized anode materials exhibit excellent cycle stability due to the entropy-stabilized crystal structure. The (Cr0.2Fe0.2Mn0.2Ni0.2Mg0.2)3O4 containing inactive Mg ion not only delivers a high initial specific capacity of 1300 mA·h/g at a specific current of 200 mA/g, but also exhibits a good rate capacity of 450 mA·h/g even at 3 A/g. Furthermore, the value of Li+ diffusion coefficient of (Cr0.2Fe0.2Mn0.2Ni0.2Mg0.2)3O4 after 500 cycles is more 3 times than that of the other two high-entropy oxides. The improved electrochemical performance is attributed to the inactive Mg2+ in the entropy-stabilized (Cr0.2Fe0.2Mn0.2Ni0.2Mg0.2)3O4 anode material, which not only avoids agglomeration of active materials but also increases the Li+ diffusivity during the de/lithiation process.

Key words: Lithium-ion battery, High-entropy oxide, Spinel-type, Electrochemical performance, Inactive Mg ion

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