Journal
CHEMICAL ENGINEERING JOURNAL
Volume 428, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2021.131113
Keywords
1T-MoS2; N-doping carbon; Composite; Potassium ion batteries; Sodium ion batteries
Categories
Funding
- National Natural Science Foundation of China [52072328]
- Natural Science Foundation of Shandong Province [ZR2020QB108]
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1 T-MoS2/MoOx@NC modified by hierarchical N-doped carbon exhibits excellent rate capability and long-term cycle life as an anode material for potassium-ion batteries. Additionally, it shows high reversible capacity and outstanding cyclic stability as an anode material for sodium-ion batteries.
Metallic MoS2 (1 T-MoS2) is expected as a new anode to effectively storage K+/Na+ due to the merits of high capacity, large layer distance and good metallic conductivity. The main bottleneck of 1 T-MoS2 anode stems from the structure pulverization caused by the large volume changes upon cycling, leading to the rapid capacity fading. Herein, hierarchical N-doped carbon modified 1 T-MoS2/MoOx microspheres (1 T-MoS2/MoOx@NC) assembled by some primary nanoparticles are first fabricated by a facile solvothermal synthesis and followed annealing treatment. As anode materials for potassium-ion batteries, 1 T-MoS2/MoOx@NC delivers the outstanding rate capability (257.9/128.8 mAh g-1 at 0.05/0.5 A g-1) and exceptional long-term cycle life up to 400 cycles. 1 T-MoS2/MoOx@NC as anode materials for sodium-ion batteries also shows high reversible capacity and outstanding cyclic stability (473.8 mAh g-1 over 1300 cycles at 2 A g-1). The related kinetics tests have been used to explain the excellent potassium/sodium storage performances. Meanwhile, the 1 T-MoS2/MoOx@NC// Na3V2(PO4)3 full cell for SIBs has been assembled, which exhibits good electrochemical performances. The discharge capacity can keep at 163.5 mAh g-1 after 300 cycles at 0.5 A g-1. The excellent potassium/sodium storage performances are mainly attributed to the particular hierarchical structure as well as the synergistic effect of 1 T-MoS2, MoOx and N-doped carbon.
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