Journal
NANO LETTERS
Volume 15, Issue 8, Pages 5214-5220Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.5b02483
Keywords
Liquid cell TEM; electrochemical liquid cell; solid electrolyte interface; MoS2; lithium-ion batteries
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Funding
- U.S. Department of Energy (DOE) [DE-AC02-05CH11231]
- National Basic Research Program of China [2013CB632101]
- China Scholarship Council [201406190080]
- Austrian Science Fund (FWF) [J3397]
- DOE Office of Science Early Career Research Program
- Austrian Science Fund (FWF) [J 3397] Funding Source: researchfish
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We report the observation of lithiation/delithiation of MoS2 nanosheets in a LiPF6/EC/DEC commercial electrolyte for the application of lithium-ion batteries using electrochemical liquid cell transmission electron microscopy (TEM). Upon discharge in a voltage range of 1.8-1.2 V, MoS2 on the Ti electrode underwent irreversible decomposition resulting in fragmentation of the MoS2 nanosheets into 5-10 nm MoS2 nanoparticles. Repeated experiments also show that some MoS2 nanosheets do not decompose upon lithiation. Instead, lithiation induced structural expansion and deformation has been observed. A solid-electrolyte interface (SEI) was formed on the anode side of the Ti electrode in contact with Li metal. The SEI layer is composed of LiF nanocrystals distributed within the entire layer with the constituent elements C, O, and F. However, no passivation film was observed on the cathode side of the Ti electrode with MoS2 nanosheets on it. Such an in situ electrochemical liquid cell TEM study sheds light on battery degradation mechanisms.
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