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

doi:10.7503/cjcu20200263

Abstract

Abstract: The spinel-type high-entropy oxides(HEOs),(Cr_0.2Fe_0.2Mn_0.2Ni_0.2M_0.2)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 (Cr_0.2Fe_0.2Mn_0.2Ni_0.2Mg_0.2)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 (Cr_0.2Fe_0.2Mn_0.2Ni_0.2Mg_0.2)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 (Cr_0.2Fe_0.2Mn_0.2Ni_0.2Mg_0.2)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

CLC Number:

O646

TrendMD:

XIANG Houzheng, XIE Hongxiang, LI Wenchao, LIU Xiaolei, MAO Aiqin, YU Haiyun. Synthesis and Electrochemical Performance of Spinel-type High-entropy Oxides[J]. Chem. J. Chinese Universities, 2020, 41(8): 1801.

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