Journal
JOURNAL OF MAGNESIUM AND ALLOYS
Volume 9, Issue 1, Pages 78-89Publisher
KEAI PUBLISHING LTD
DOI: 10.1016/j.jma.2020.12.001
Keywords
Magnesium sulfur batteries; MXene; Co3S4; Electrochemical sulfur conversion; Mg ion diffusion
Categories
Funding
- National Natural Science Foundation of China [21603019]
- Opening Project of State Key Laboratory of High Performance Ceramics and Superfine Microstructure [SKL201807SIC]
- Hundred Talents Program of Chongqing University
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In this study, a Co3S4@MXene heterostructure was proposed as an effective sulfur host for reversible Mg-S batteries, improving battery performance by enhancing magnesium ion diffusion dynamics and electrochemical redox kinetics. The developed Mg-S batteries using Co3S4@MXene-S as the cathode material exhibited high sulfur utilization, specific capacity of 1220 mAh g(-1), retention of 528 mAh g(-1) after 100 cycles, and satisfactory rate performance even at 2 C. This work sheds light on advanced cathode design for reversible high energy Mg-S batteries.
The rechargeable Mg-S batteries are attractive because of their resource abundances of Mg and S, high volumetric energy density, and less dendrite property of Mg anodes. However, the development is barred by the intrinsic low electronic conductivity of S and the discharge products as well as the lack of understanding the hidden electrochemical kinetics. Here, a Co3S4@MXene heterostructure is proposed as effective sulfur host for reversible Mg-S batteries. XPS results and density functional theory (DFT) calculation confirm that the chemical interaction between the decorated Co3S4 nanocrystals host and polysulfide intermediates could well absorb and catalyze the polysulfides conversion, thus improve the electrochemical redox kinetics. Meanwhile, the MXene matrix could promote Mg ion diffusion dynamics greatly. As a result, the developed Mg-S batteries using the Co3S4@MXene-S as the cathode material could demonstrate high sulfur utilization with specific capacity of 1220 mAh g(-1) and retain a capacity of 528 mAh g(-1) after 100 cycles, together with a satisfactory rate performance even at 2 C. This work shed light on the advanced cathode design for reversible high energy Mg-S batteries. (C) 2020 Published by Elsevier B.V. on behalf of Chongqing University.
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