10.1021/acs.nanolett.5b00388.s001
Yanliang Liang
Yanliang
Liang
Hyun Deog Yoo
Hyun Deog
Yoo
Yifei Li
Yifei
Li
Jing Shuai
Jing
Shuai
Hector
A. Calderon
Hector
A.
Calderon
Francisco Carlos Robles Hernandez
Francisco
Carlos Robles Hernandez
Lars C. Grabow
Lars C.
Grabow
Yan Yao
Yan
Yao
Interlayer-Expanded Molybdenum Disulfide Nanocomposites
for Electrochemical Magnesium Storage
American Chemical Society
2015
Mg diffusion behavior
Mg storage materials
novel intercalation chemistry
MoS 2
report interlayer expansion
Electrochemical Magnesium StorageMg
interlayer expansion approach
expansion boosts Mg diffusivity
divalent Mg ion
2015-03-11 00:00:00
Journal contribution
https://acs.figshare.com/articles/journal_contribution/Interlayer_Expanded_Molybdenum_Disulfide_Nanocomposites_for_Electrochemical_Magnesium_Storage/2187859
Mg
rechargeable batteries (MgRBs) represent a safe and high-energy battery
technology but suffer from the lack of suitable cathode materials
due to the slow solid-state diffusion of the highly polarizing divalent
Mg ion. Previous methods improve performance at the cost of incompatibility
with anode/electrolyte and drastic decrease in volumetric energy density.
Herein we report interlayer expansion as a general and effective atomic-level
lattice engineering approach to transform inactive intercalation hosts
into efficient Mg storage materials without introducing adverse side
effects. As a proof-of-concept we have combined theory, synthesis,
electrochemical measurement, and kinetic analysis to improve Mg diffusion
behavior in MoS<sub>2</sub>, which is a poor Mg transporting material
in its pristine form. First-principles simulations suggest that expanded
interlayer spacing allows for fast Mg diffusion because of weakened
Mg–host interactions. Experimentally, the expansion was realized
by inserting a controlled amount of poly(ethylene oxide) into the
lattice of MoS<sub>2</sub> to increase the interlayer distance from
0.62 nm to up to 1.45 nm. The expansion boosts Mg diffusivity by 2
orders of magnitude, effectively enabling the otherwise barely active
MoS<sub>2</sub> to approach its theoretical storage capacity as well
as to achieve one of the highest rate capabilities among Mg-intercalation
materials. The interlayer expansion approach can be leveraged to a
wide range of host materials for the storage of various ions, leading
to novel intercalation chemistry and opening up new opportunities
for the development of advanced materials for next-generation energy
storage.