Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 10, Issue 43, Pages 36988-36995Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.8b12662
Keywords
NbSe2; transition metal dichalcogenides; lithium and magnesium storage mechanisms; magnesium ion batteries; microwave-assisted synthesis
Funding
- National Key Research and Development Program of China [2016YFA0202603, 2016YFA0202601]
- National Natural Science Fund for Distinguished Young Scholars [51425204]
- National Natural Science Foundation of China [51521001, 51602239]
- Programme of Introducing Talents of Discipline to Universities [B17034]
- Hubei Provincial Natural Science Foundation of China [2016CFB267]
- International Science AMP
- Technology Cooperation Program of China [2013DFA50840]
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As a novel and potential transition metal dichalcogenide (TMDC), NbSe2 has low ion diffusion barrier when applied in energy-storage systems, such as traditional lithium-ion batteries and novel magnesium-ion batteries (MIBs). In this work, we have developed a novel hexagonal NbSe2 material with a nanosized surface via a facile microwave-hydrothermal method. The Li+-storage mechanism of NbSe2 with surface conversion and internal intercalation is thoroughly revealed by in situ X-ray diffraction (XRD), ex situ high-resolution transmission electron microscopy, and ex situ scanning electron microscopy. Besides, Mg2+ intercalation mechanism is confirmed via ex situ XRD and ex situ X-ray photoelectron spectroscopy for the first time. In addition, as the cathode for MIBs, NbSe2 with a nanosized surface exhibits a high rate capacity of 101 mA h g(-1) at 200 mA g(-1) with a high discharge plateau at 1.30 V. Our work builds a deep understanding of ion-storage mechanisms in TMDCs and provides guidance for designing new electrode materials with high electrochemical performances.
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