期刊
CHEMICAL ENGINEERING JOURNAL
卷 417, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2021.129328
关键词
Mo doping; Sulfur vacancies; Interlayer spacing expansion; Cathode materials; Magnesium ion batteries
资金
- National Natural Science Foundation of China [51672144, 51572137, 51702181, 52072196, 52002199, 52002200]
- Major Basic Research Program of Natural Science Foundation of Shandong Province [ZR2020ZD09]
- Shandong Provincial Key Research and Development Program (SPKRDP) [2019GGX102055]
- Natural Science Foundation of Shandong Province [ZR2019BEM042]
- Innovation and Technology Program of Shandong Province [2020KJA004]
- Guangdong Basic and Applied Basic Research Foundation [2019A1515110933]
- China Postdoctoral Science Foundation [2020M683450]
- Taishan Scholars Program of Shandong Province [ts201511034]
Mo-doping in VS4 shortens the diffusion path for fast reaction kinetics, maintains the structure stability, and provides more active sites for increasing reversible capacity, resulting in excellent electrochemical properties. This design strategy of metal ion doping provides a favorable reference for developing various alkali metal ion batteries.
Magnesium ion batteries (MIBs) are considered as the next potential candidate due to the low reduction potential, high theoretical volumetric capacity, economicaland low degree of dendrite formation. However, it is still a great challenge for enhancing its electrochemical properties by decorating cathode materials. Herein, Modoped VS4 with various Mo content has been synthesized via one-step hydrothermal method. The characterization results show that Mo-doping not only regulate the morphology and enhance the electrical conductivity, but also expand the interlayer spacing and generate rich sulfur vacancies. Based on the synergistic effect of above various factors, Mo-doping has shortened the diffusion path for fast reaction kinetics, maintained the structure stability and provided more active sites for the increasing of reversible capacity, resulting in the excellent electrochemical properties. As for Mo-doped VS4 with various Mo content, 3% Mo-VS4 exhibits the superior cycling stability with the high specific capacity about 120 mAh g(-1) at 50 mA g(-1) over 350 cycles and excellent rate performance under the high current density of 500 mA g(-1). In addition, pesudocapaticance-like contribution analysis as well as galvanostatic intermittent titration technique (GITT) further confirm that rich sulfur vacancies and hollow flower-like microsphere are beneficial for the fast Mg2+ diffusion and enhanced reaction kinetics. Our design strategy of the metal ion doping provides a favorable reference for developing various alkali metal ion batteries.
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