Journal
ENERGY STORAGE MATERIALS
Volume 27, Issue -, Pages 591-598Publisher
ELSEVIER
DOI: 10.1016/j.ensm.2019.12.016
Keywords
Potassium-ion batteries; Dual anionic vacancies; MoSSe; Carbon nanofiber membrane; Density functional theory
Funding
- National Natural Science Foundation of China [51873198, 51503184]
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In spite of the low-cost and abundant potassium resources, the potential commercialization of potassium-ion batteries (PIBs) is still confined by the large-sized K+ ions and sluggish kinetic process. A flexible free-standing advanced anode for PIBs is synthesized by tactfully incorporating dual anionic vacancies on MoSSe arrays in combination of carbon nanofiber membrane (v-MoSSe@CM). The vacancy-rich MoSSe arrays in v-MoSSe@CM dramatically enhance the adsorption of K+ ions, leading to a higher capacity of 370.6 mAh g(-1) at 0.1 A g(-1) over 60 cycles as compared with that 168.5 mAh g(-1) of vacancy-free MoSSe@CM. Meanwhile, the density functional theory (DFT) calculations demonstrate a facilitated ability for K+ insertion into v-MoSSe interlayers with a much more negative adsorption value of -1.74 eV than that (0.53 eV) of vacancy-free MoSSe. The thousands of carbon nanofiber-supported three-dimensional frameworks can not only inhibit the agglomeration of MoSSe nanosheets, but also remit the volume expansion and avoid possible collapse of the nanostructures during cycling, resulting into a high capacity retention of 220.5 mAh g(-1) at 0.5 A g(-1) after 1000 cycles. Therefore, this work uncovers the relationship between vacancy engineering and potassium-ion storage performance, guiding a feasible route to develop potential materials for potassium-ion battery.
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