Journal
JOURNAL OF COLLOID AND INTERFACE SCIENCE
Volume 593, Issue -, Pages 408-416Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcis.2021.03.015
Keywords
FeS nanodots; Anode; Potassium ion batteries; DFT calculation
Categories
Funding
- National Natural Science Foundation of China [51974114, 51672075, 21908049]
- China Postdoctoral Science Foundation [2020 M682560]
- science and technology innovation Program of Hunan Province [2020RC2024]
- Hunan Provincial Natural Science Foundation of China [2020JJ4175]
- Fundamental Research Funds for the Central Universities
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Potassium-ion batteries (PIBs) are considered a promising alternative to Lithium-ion batteries (LIBs) due to their low cost and abundant potassium resources. FeS@SPC structure is beneficial for potassium-ion storage, as it helps reduce agglomeration and volume expansion of FeS, resulting in improved electrochemical performance.
Potassium-ion batteries (PIBs) is one of the most promising alternatives for Lithium-ion batteries (LIBs) due to the low-cost and abundant potassium reserves. However, the electrochemical performances of PIBs were seriously hindered by the larger radius of potassium ions, resulting in a slow kinetic during the electrochemical reaction, especially in the PIB anodes. In the study, we propose FeS nanodots embedded S-doped porous carbon (FeS@SPC) synthesized by a simple self-template method for the storage of potassium-ions. The FeS nanodots with an average diameter of 5 nm are uniformly distributed in S doped porous carbon nanosheets. When the FeS@SPC was used as the anode in PIBs, the unique structure of FeS@SPC can relieve the agglomeration and volume expansion of FeS effectively during the charge-discharge process. Even after 3000 cycles, the FeS nanodots are still uniformly embedded in porous carbon without agglomeration. Ascribed to the merits, the FeS@SPC exhibits a reversible capacity of 309 mAh g(-1) at 0.1 A g(-1) after 100 cycles and 232 mAh g(-1) at 1 A g(-1) after 3000 cycles. The excellent electrochemical performance of FeS@SPC is attributed to the synergistic effects of FeS nanodots and S-doped porous carbon, which facilitated the diffusion of electrolyte and accelerated the migration of potassium ions. Moreover, theoretical calculation results also suggest that the van der waals heterostructure of FeS@SPC displays higher adsorption energy for potassium ions than that of S-doped graphene, indicating the suitability of FeS@SPC for K storage. (C) 2021 Elsevier Inc. All rights reserved.
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