Exploring
robust
electrode
materials
which
could
permit
fast
and
reversible
insertion/extraction
of
large
K+
is
a
crucial
challenge
for
potassium-ion
batteries
(PIBs).
Smart
interfacial
design
facilitate
charge
transport
as
well
assure
the
integrity
electrode.
Herein,
Cetyltrimethylammonium
bromide
(CTAB)
was
found
to
play
bifunctional
roles
in
construction
Nb2CTx@MoSe2
heterostructure.
Firstly,
functionalization
CTAB
on
surface
Nb2CTx
influence
subsequent
growth
MoSe2
by
electrostatic
effect,
stereochemical
effect
synergetic
Lewis
acid-base
interaction,
leading
formation
with
tiled
Secondly,
interlayer
spacing
expanded
from
0.77
1.21
nm
owing
pillar
CTAB.
As
excepted,
capacity
(406
mA
h
g-1)
retention
80%
100
g-1
1000
concerning
rate
capability
specific
maintains
at
240
(at
2000
over
300
cycles.
The
calculated
DK
values
(from
GITT
measurement)
titled
C-T-Nb2CTx@MoSe2@C
two
orders
magnitude
larger
than
traditional
T-Nb2CTx@MoSe2@C
electrode,
further
confirming
intimate
interface
between
provide
convenient
channels
diffusion
kinetics.
Finally,
ex-situ
characterizations
different
charging
discharging
voltage
stages,
including
XRD/Raman/HRTEM/XPS,
have
been
carried
out
reveal
potassium
storage
mechanism
This
work
provides
facile
strategy
regulation
engineering
assist
extend
other
MXenes-TMCs
hybrid
electrodes.
Energy & Environmental Science,
Год журнала:
2023,
Номер
16(10), С. 4191 - 4250
Опубликована: Янв. 1, 2023
The
design
strategies
and
internal
mechanisms
of
MXene-based
materials
in
flexible
energy
storage
devices
are
comprehensively
introduced.
Besides,
the
current
trends,
limitations,
future
outlooks
proposed.
Angewandte Chemie International Edition,
Год журнала:
2024,
Номер
63(35)
Опубликована: Июнь 13, 2024
Abstract
The
inevitable
shuttling
and
slow
redox
kinetics
of
lithium
polysulfides
(LiPSs)
as
well
the
uncontrolled
growth
Li
dendrites
have
strongly
limited
practical
applications
lithium‐sulfur
batteries
(LSBs).
To
address
these
issues,
we
innovatively
constructed
carbon
nanotubes
(CNTs)
encapsulated
Co
nanoparticles
in
situ
grown
on
TiN‐MXene
nanosheets,
denoted
TiN‐MXene‐Co@CNTs,
which
could
serve
simultaneously
both
sulfur/Li
host
to
kill
“three
birds
with
one
stone”
(1)
efficiently
capture
soluble
LiPSs
expedite
their
conversion,
(2)
accelerate
nucleation/decomposition
solid
2
S,
(3)
induce
homogeneous
deposition.
Benefiting
from
synergistic
effects,
TiN‐MXene‐Co@CNTs/S
cathode
a
sulfur
loading
2.5
mg
cm
−2
show
high
reversible
specific
capacity
1129.1
mAh
g
−1
after
100
cycles
at
0.1
C,
ultralong
cycle
life
over
1000
1.0
C.
More
importantly,
it
even
achieves
areal
6.3
50
under
8.9
low
E/S
ratio
5.0
μL
.
Besides,
TiN‐MXene‐Co@CNTs
deliver
stable
plating/striping
behavior
h.
ACS Applied Materials & Interfaces,
Год журнала:
2024,
Номер
16(3), С. 3888 - 3900
Опубликована: Янв. 10, 2024
The
severe
shuttle
effect
and
the
depletion
of
active
sulfur
result
in
performance
deterioration,
presenting
two
formidable
issues
that
must
be
overcome
to
achieve
high-mass-loading
lithium–sulfur
batteries.
Herein,
we
reported
a
composite
separator
by
introducing
carbon
photonic
crystals
with
hierarchically
ordered
porous
structure
on
commercial
separator.
interconnected
hierarchical
macro–meso–micropore
network
facilitate
efficient
trapping
polysulfides
rapid
transport
lithium
ions.
high
ion
diffusivity
promotes
conversion
enhancing
utilization
mitigating
occurrence
"dead
sulfur"
surface
Impressively,
under
loading
3
mg
cm–2,
battery
displayed
reversible
capacity
1582
mA
h
g–1
at
0.1
C
an
excellent
long-term
cycling
decay
rate
as
low
0.033%
per
cycle
over
1500
cycles
1
C.
Surprisingly,
represented
935
0.2
even
6.71
cm–2.
design
underscores
pivotal
role
architecture
improving
brings
bright
prospect
enable
commercialization
Angewandte Chemie,
Год журнала:
2024,
Номер
136(35)
Опубликована: Июнь 13, 2024
Abstract
The
inevitable
shuttling
and
slow
redox
kinetics
of
lithium
polysulfides
(LiPSs)
as
well
the
uncontrolled
growth
Li
dendrites
have
strongly
limited
practical
applications
lithium‐sulfur
batteries
(LSBs).
To
address
these
issues,
we
innovatively
constructed
carbon
nanotubes
(CNTs)
encapsulated
Co
nanoparticles
in
situ
grown
on
TiN‐MXene
nanosheets,
denoted
TiN‐MXene‐Co@CNTs,
which
could
serve
simultaneously
both
sulfur/Li
host
to
kill
“three
birds
with
one
stone”
(1)
efficiently
capture
soluble
LiPSs
expedite
their
conversion,
(2)
accelerate
nucleation/decomposition
solid
2
S,
(3)
induce
homogeneous
deposition.
Benefiting
from
synergistic
effects,
TiN‐MXene‐Co@CNTs/S
cathode
a
sulfur
loading
2.5
mg
cm
−2
show
high
reversible
specific
capacity
1129.1
mAh
g
−1
after
100
cycles
at
0.1
C,
ultralong
cycle
life
over
1000
1.0
C.
More
importantly,
it
even
achieves
areal
6.3
50
under
8.9
low
E/S
ratio
5.0
μL
.
Besides,
TiN‐MXene‐Co@CNTs
deliver
stable
plating/striping
behavior
h.
Nano Letters,
Год журнала:
2024,
Номер
24(26), С. 7992 - 7998
Опубликована: Июнь 17, 2024
The
development
of
advanced
cathode
materials
able
to
promote
the
sluggish
redox
kinetics
polysulfides
is
crucial
bringing
lithium–sulfur
batteries
market.
Herein,
two
electrode
materials:
namely,
Zr2PS2
and
Zr2PTe2,
are
identified
through
screening
several
hundred
thousand
compositions
in
Inorganic
Crystal
Structure
Database.
First-principles
calculations
performed
on
these
materials.
These
structures
similar
that
classical
MXenes.
Concurrently,
show
Zr2PTe2
possess
high
electrical
conductivity,
Li
ion
diffusion,
have
excellent
electrocatalytic
activity
for
Li–S
reaction
particularly
Li2S
decomposition.
Besides,
mechanisms
behind
predicted
performance
elucidated
electron
localization
function,
charge
density
difference,
localized
orbital
locator.
This
work
not
only
identifies
candidate
sulfur
additives
but
may
also
serve
as
a
reference
identification
additional
new
generations
batteries,
cathodes.
