Interface ion-exchange strategy of MXene@FeIn2S4 hetero-structure for super sodium ion half/full batteries

Mengqi Wang; Binyang Qin; Shimei Wu; Yining Li; Chilin Liu; Yufei Zhang; Lingxing Zeng; Haosen Fan

doi:10.1016/j.jcis.2023.07.071

Interface ion-exchange strategy of MXene@FeIn₂S₄ hetero-structure for super sodium ion half/full batteries

J Colloid Interface Sci. 2023 Nov 15;650(Pt B):1457-1465. doi: 10.1016/j.jcis.2023.07.071. Epub 2023 Jul 16.

Authors

Mengqi Wang¹, Binyang Qin¹, Shimei Wu¹, Yining Li¹, Chilin Liu¹, Yufei Zhang², Lingxing Zeng³, Haosen Fan⁴

Affiliations

¹ School of Chemistry and Chemical Engineering, Guangzhou University, Guangzhou 510006, China.
² School of Chemistry and Chemical Engineering, Guangzhou University, Guangzhou 510006, China; College of Materials Science and Metallurgy Engineering, Guizhou University, Guiyang 550025, China. Electronic address: yfzhang@gdut.edu.cn.
³ College of Environmental Science and Engineering, Fujian Normal University, Fuzhou, Fujian 350007, China. Electronic address: zenglingxing@fjnu.edu.cn.
⁴ School of Chemistry and Chemical Engineering, Guangzhou University, Guangzhou 510006, China; College of Materials Science and Metallurgy Engineering, Guizhou University, Guiyang 550025, China. Electronic address: hsfan@gzhu.edu.cn.

PMID: 37481783
DOI: 10.1016/j.jcis.2023.07.071

Abstract

Herein, a well-designed hierarchical architecture of bimetallic transition sulfide FeIn₂S₄ nanoparticles anchoring on the Ti₃C₂ MXene flakes has been prepared by cation exchange and subsequent high-temperature sulfidation processes. The introduction of MXene substrate with excellent conductivity not only accelerates the migration rate of Na⁺ to achieve fast reaction dynamics but provides abundant deposition sites for the FeIn₂S₄ nanoparticles. In addition, this hierarchical structure of MXene@FeIn₂S₄ can effectively restrain the accumulation of MXene to guarantee the maximized exposure of redox active sites into the electrolyte, and simultaneously relieve the volume expansion in the repeated discharging/charging processes. The MXene@FeIn₂S₄ displays outstanding rate capability (448.2 mAh g^-1 at 5 A g^-1) and stable long cycling performance (428.1 mAh g^-1 at 2 A g^-1 after 200 cycles). Moreover, the Na_y-In₆S₇ phase detected by ex-situ XRD and XPS characterization may be regarded as a "buffer" to maintain the stability of the Fe-based components and enhance the reversibility of the electrochemical reaction. This work confirms the practicability of constructing the hierarchical structure bimetallic sulfides with the promising electrochemical performance.

Keywords: Full battery; Heterostructure; Ion-exchange; MXene@FeIn(2)S(4); Sodium-ion batteries.