Interconnected
Vertically Stacked 2D-MoS2 for Ultrastable Cycling of Rechargeable
Li-Ion Battery
Posted on 2019-05-31 - 21:15
A two-dimensional
(2D) layer-structured material is often a high-capacity
ionic storage material with fast ionic transport within the layers.
This appears to be the case for nonconversion layer structure, such
as graphite. However, this is not the case for conversion-type layered
structure such as transition-metal sulfide, in which localized congestion
of ionic species adjacent to the surface will induce localized conversion,
leading to the blocking of the fast diffusion channels and fast capacity
fading, which therefore constitutes one of the critical barriers for
the application of transition-metal sulfide layered structure. In
this work, we report the tackling of this critical barrier through
nanoscale engineering. We discover that interconnected vertically
stacked two-dimensional-molybdenum disulfide can dramatically enhance
the cycling stability. Atomic-level in situ transmission electron
microscopy observation reveals that the molybdenum disulfide (MoS2) nanocakes assembled with tangling {100}-terminated nanosheets
offer abundant open channels for Li+ insertion through
the {100} surface, featuring an exceptional cyclability performance
for over 200 cycles with a capacity retention of 90%. In contrast,
(002)-terminated MoS2 nanoflowers only retain 10% of original
capacity after 50 cycles. The present work demonstrates a general
principle and opens a new route of crystallographic design to enhance
electrochemical performance for assembling 2D materials for energy
storage.
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Sun, Congli; Zhao, Kangning; He, Yang; Zheng, Jianming; Xu, Wangwang; Zhang, Chenyu; et al. (2019). Interconnected
Vertically Stacked 2D-MoS2 for Ultrastable Cycling of Rechargeable
Li-Ion Battery. ACS Publications. Collection. https://doi.org/10.1021/acsami.9b02359
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AUTHORS (11)
CS
Congli Sun
KZ
Kangning Zhao
YH
Yang He
JZ
Jianming Zheng
WX
Wangwang Xu
CZ
Chenyu Zhang
XW
Xiang Wang
MG
Mohan Guo
LM
Liqiang Mai
CW
Chongmin Wang
MG
Meng Gu