Small Methods,
Journal Year:
2024,
Volume and Issue:
unknown
Published: Oct. 9, 2024
Graphene
(Gr)
and
carbon
nanotubes
(CNTs),
the
two
intriguing
nanomaterials,
have
presented
great
potential
in
serving
as
high-performance
electrocatalysts
lithium-sulfur
(Li-S)
chemistry.
The
concurrent
management
of
both
materials
would
achieve
a
promoted
synergistic
effect.
Nevertheless,
there
still
remains
lack
an
effective
material
synthesis
route.
Herein,
single-step
plasma-enhanced
chemical
vapor
deposition
(PECVD)
strategy
is
devised
to
prepare
Gr@CNTs
heterostructures
with
strong
bonded
connections.
In
PECVD
system,
damaged
sidewalls
generated
CNT
tubes
can
serve
appropriate
nucleation
sites
for
further
Gr
growth.
formation
mechanisms
are
thoroughly
explored
aspects
experimental
characterizations
theoretical
calculations.
To
confirm
validity
this
approach,
thus-constructed
architectures
employed
sulfur
host,
enabling
boosted
redox
kinetics
polysulfides.
This
project
provides
fundamental
insight
into
mechanism
exploration
growth
heterostructure,
hence
promoting
practical
application
prospect
nanomaterials
toward
Li-S
systems.
Small,
Journal Year:
2024,
Volume and Issue:
20(44)
Published: July 6, 2024
The
conductive
carbon-based
interlayer,
as
the
secondary
current
collector
in
self-dissolving
battery
system,
can
effectively
capture
escaping
cathode
active
materials,
inducing
deep
release
of
remaining
capacity.
In
multi-step
reactions
Li─S
batteries,
environmental
tolerance
interlayer
to
polysulfides
determines
inhibition
shuttle
effects.
Here,
a
modified
metal-organic
framework
(Mn-ZIF67)
is
utilized
obtain
nitrogen-doped
carbon-coated
heterogeneous
Co-MnO
(Co-MnO@NC)
with
dual
catalytic
center
for
functional
materials.
synergistic
coupling
mechanism
NC
and
achieves
rapid
deposition
conversion
free
polysulfide
fragmented
sulfur
on
collector,
reducing
capacity
loss
cathode.
Co-MnO@NC/PP
separator
maintains
an
initial
1050
mAh
g
Advanced Functional Materials,
Journal Year:
2024,
Volume and Issue:
unknown
Published: Oct. 10, 2024
Abstract
The
intrinsically
sluggish
sulfur
reduction
reaction
kinetics
and
serious
shuttle
effect
of
soluble
lithium
polysulfides
(LiPSs)
severely
impede
the
practical
commercialization
lithium‐sulfur
(Li‐S)
batteries.
Herein,
self‐supported
tungsten
nitride
carbide
heterostructures
with
vanadium
doping
that
are
directly
grown
on
carbon
cloth
substrate
(CC@V‐W
2
N/WC
1‐
x
)
creatively
designed
for
Li‐S
batteries,
which
can
tandemly
catalyze
liquid–liquid
conversion
liquid–solid
polysulfide
intermediate
free
any
interference
from
polymer
binders
conductive
additives.
Noteworthy,
rich
heterointerfaces
beneficial
rapid
charge
transfer,
strong
chemical
adsorption
toward
LiPSs,
massive
exposed
catalytically
active
sites,
remarkable
catalytic
activities.
Consequently,
batteries
assembled
CC@V‐W
/S
cathodes
exhibit
high
utilization,
superior
rate
capability,
decent
long‐term
cycling
stability.
Furthermore,
experimental
analyses
theoretical
calculations
jointly
substantiate
V‐W
N
component
is
more
effective
in
catalyzing
long‐chain
while
V‐WC
benefits
favorable
Li
S
deposition
kinetics.
More
importantly,
pouch
cells
also
fabricated
to
demonstrate
their
feasibility
applications.
This
work
not
only
highlights
significance
tandem
catalysis
consecutive
LiPSs
but
provides
a
feasible
avenue
developing
highly
efficient
electrocatalysts
high‐performance
Lithium–sulfur
batteries
(LSBs)
offer
high
specific
energy
at
low
cost
but
are
hindered
by
the
shuttle
effect,
which
reduces
capacity
and
cycle
life
due
to
sluggish
sulfur
(S)
redox
kinetics.
Although
issue
can
be
addressed
modifying
separator
with
metal–nitrogen–carbon
(M–N–C)
materials,
detailed
explanations
often
lacking.
In
this
study,
cobalt-embedded
nitrogen-doped
carbon
nanotubes
(Co-NCNTs)
were
used
functionalize
separator.
X-ray
photoelectron
spectroscopy
shows
that
Li+
from
lithium
polysulfides
(LiPSs)
interacts
N–C
framework
in
Co-NCNTs
during
discharge,
accompanied
electron
injection
maintain
charge
balance.
This
exchange
is
more
pronounced
Co
N
sites
throughout
charge/discharge
cycle.
facilitate
rate-determining
conversion
between
Li2S
upon
interaction
Co-NCNTs.
As
a
result,
our
modified
LSBs
delivered
1496.9
501.1
mA
h
g–1
discharge
rates
of
0.1
5
C,
respectively,
maintaining
stability
over
100
cycles
without
significant
effect.
work
provides
valuable
insights
into
designing
high-energy,
long-life
through
modification.
ACS Nano,
Journal Year:
2025,
Volume and Issue:
unknown
Published: March 11, 2025
Covalent
organic
frameworks
(COFs)
have
shown
promise
as
bifunctional
catalysts
to
simultaneously
mitigate
shuttle
effects
and
Li
dendrite
issues
of
lithium–sulfur
(Li–S)
batteries.
However,
the
inherent
low
conductivity
COFs
has
significantly
limited
their
catalytic
activity
stability.
Herein,
durability
COF/MXene
heterostructure
are
activated
by
tuning
surface
curvatures
interfaced
with
MXene.
The
increased
curvature
could
induce
enhanced
electron
delocalization
alter
geometry,
which
in
turn
strengthens
lithium
polysulfide
adsorption,
lowers
energy
barriers,
stabilizes
sites
promote
sulfur
redox
reactions.
Concurrently,
hierarchical
structure
improves
electrolyte
penetration
wettability,
facilitates
rapid
ion
transport,
homogenizes
Li-ion
flux
distribution,
thus
achieving
uniform
deposition.
Consequently,
1D-COF/MXene
Li–S
batteries
demonstrate
a
high-rate
capacity
926
mA
h
g–1
at
4C,
stable
cycling
performance
reversible
589
3C
after
500
cycles,
high
604
cm–2
loading
3.5
mg
under
electrolyte-to-sulfur
ratio
10
μL
mg–1.
This
work
offers
an
efficacious
approach
regulate
stability
catalysts.
