am6b01671_si_004.avi (2.53 MB)
New Insights into Electrochemical Lithiation/Delithiation Mechanism of α‑MoO3 Nanobelt by in Situ Transmission Electron Microscopy
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posted on 2016-03-23, 00:00 authored by Weiwei Xia, Qiubo Zhang, Feng Xu, Litao SunThe α-MoO3 nanobelt
has great potential for application as anode of lithium ion batteries
(LIBs) because of its high capacity and unique one-dimensional layer
structure. However, its fundmental electrochemical failure mechanism
during first lithiation/delithiation process is still unclear. Here,
we constructed an electrochemical setup within α-MoO3 nanobelt anode inside a transmission electron microscope to observe
in situ the mircostructure evolution during cycles. Upon first lithiation,
the α-MoO3 nanobelt converted into numerous Mo nanograins
within the Li2O matrix, with an obvious size expansion.
Interestingly, α-MoO3 nanobelt was found to undergo
a two-stage delithiation process. Mo nanograins were first transformed
into crystalline Li1.66Mo0.66O2 along
with the disappearance of Li2O and size shrink, followed
by the conversion to amorphous Li2MoO3. This
irreversible phase conversion should be responsible for the large
capacity loss in first cycle. In addition, a fully reversile phase
conversion between crystalline Mo and amorphous Li2MoO3 was revealed accompanying the formation and disapperance
of the Li2O layer during the subsequent cycles. Our experiments
provide direct evidence to deeply understand the distinctive electrochemical
lithiation/delithiation behaviors of α-MoO3 nanobelt,
shedding light onto the development of α-MoO3 anode
for LIBs.
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LIBphase conversionLi 2 Olithium ion batteriesSitu Transmission Electron Microscopynanobeltsize expansionLi 1.66 Mo 0.66 O 2Mo nanograinselectrochemical setupLi 2 O layerNew Insightsreversile phase conversionfundmental electrochemical failure mechanismtransmission electron microscopemo nanograinslayer structurecapacity lossLi 2 MoO 3Li 2 O matrixmircostructure evolution
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