Journal
ACS NANO
Volume 9, Issue 11, Pages 11296-11301Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsnano.5b04950
Keywords
sodium-ion battery; in situ TEM; phase transition; molybdenum disulfide; transition metal dichalcogenide
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Funding
- National Natural Science Foundation of China [51502007, 51522201, 11474006, 91433102]
- National Program for Thousand Young Talents of China
- University of Electronic Science and Technology of China [Y02002010301080]
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For alkali-metal-ion batteries, probing the dynamic processes of ion transport in electrodes is critical to gain insights into understanding how the electrode functions and thus how we can improve it. Here, by using in situ high-resolution transmission electron microscopy, we probe the dynamics of Na transport in MoS2 nanostructures in real-time and compare the intercalation kinetics with previous lithium insertion. We find that Na intercalation follows the two-phase reaction mechanism, that is, trigonal prismatic 2H-MoS2 -> octahedral 11-NaMoS2, and the phase boundary is similar to 2 nm thick. The velocity of the phase boundary at <10 nm/s is 1 order smaller than that of lithium diffusion, suggesting sluggish kinetics for sodium intercalation. The newly formed 1T-NaMoS2 contains a high density of defects and series superstructure domains with typical sizes of similar to 3-5 nm. Our results provide valuable insights into finding suitable Na electrode materials and understanding the properties of transition metal dichalcogenide MoS2.
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