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Research Article | Open Access

Ultrafast high-temperature sintering of high-entropy oxides with refined microstructure and superior lithium-ion storage performance

Yuhang Baia,b,cJinrui LiaHai LuaJia LiuaCuiying MaaBin Wangb( )Xing Zhaoa( )Jun Dengc
School of Material Science and Engineering, Xi’an University of Science and Technology, Xi’an 710054, China
Department of Mechanical Engineering, City University of Hong Kong, Hong Kong 999077, China
School of Safety Science and Engineering, Xi’an University of Science and Technology, Xi’an 710054, China
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Abstract

High-entropy oxides (HEOs) have received significant attention because of their tunable mechanical properties and wide range of functional applications. However, the conventional method used for sintering HEOs requires prolonged processing time, which results in excessive grain growth, thereby compromising their performance. Here, an ultrafast high-temperature sintering (UHS) strategy was adopted, and rock-salt composite (Mg0.2Co0.2Ni0.2Cu0.2Zn0.2)O was selected as model materials. Experimental parameters were tuned to illustrate the influence of applied current and soaking time on the densification process and resulting grain size. Additionally, the electrochemical performance of UHS-synthesized microparticles as anode materials in lithium-ion batteries was investigated. The results show that the ultrafast heating rate results in fine grains with a diameter of ~6–8 μm and density of 95%, which are much smaller and similar to those obtained using the conventional sintering method (25 μm and 96%). Moreover, the high surface area and reactivity of the microparticles, as well as their sluggish diffusion effect and structural stability, contribute to outstanding performance with high capacity (336 mA·h/g at 1 A/g) and ultralong cyclability (1000 cycles). This novel technique offers valuable insights into the densification process of HEOs and other materials and can thus broaden their application range.

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Journal of Advanced Ceramics
Pages 1857-1871
Cite this article:
Bai Y, Li J, Lu H, et al. Ultrafast high-temperature sintering of high-entropy oxides with refined microstructure and superior lithium-ion storage performance. Journal of Advanced Ceramics, 2023, 12(10): 1857-1871. https://doi.org/10.26599/JAC.2023.9220793

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Received: 16 May 2023
Revised: 30 July 2023
Accepted: 02 August 2023
Published: 12 October 2023
© The Author(s) 2023.

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