ACS Applied Materials & Interfaces,
Год журнала:
2024,
Номер
16(43), С. 59077 - 59087
Опубликована: Окт. 21, 2024
Because
of
the
high
theoretical
energy
density
2600
Wh
kg-1,
lithium-sulfur
batteries
(LSBs)
are
anticipated
to
be
among
next
generation
high-energy-density
storage
technologies.
However,
practical
application
LSBs
has
been
severely
hampered
by
significant
shuttle
effect
and
slow
redox
kinetics
polysulfides
(LiPSs).
To
address
above
problems,
in
this
paper,
concept
quantum
dots
(QDs)
was
introduced
design
synthesize
Mo2N
QD-modified
N-doped
graphene
nanosheets
(marked
as
Mo2N-QDs@NG),
which
were
used
separator
modification
materials
for
LSBs.
The
experimental
results
demonstrated
that
introduction
QDs
avoids
stacking
sheets
provides
more
active
sites
conversion
LiPSs.
Moreover,
enhances
chemical
fixation
catalyzes
liquid-solid
soluble
LiPSs
forming
Mo-S
Li-N
bonds
with
Additionally,
establishing
Mo-C
Mo2N,
can
facilitate
transport
electrons
ions
physically
prevent
diffusion
LiPSs,
thus
creating
a
highly
conducting
carbon
structure
support
electrochemical
reactions.
Benefiting
from
synergistic
immobilization
catalysis
physical
confinement
NG,
Mo2N-QDs@NG-PP
exhibit
enhanced
performance.
Advanced Functional Materials,
Год журнала:
2025,
Номер
unknown
Опубликована: Фев. 7, 2025
Abstract
The
slow
redox
kinetics
and
severe
shuttle
effect
caused
by
the
diffusion
of
lithium
polysulfides
(LiPSs)
severely
hinder
practical
application
lithium–sulfur
(Li–S)
batteries.
construction
utilization
catalytic
electrode
materials
are
promising
strategies
to
effectively
suppress
accelerate
sulfur
species.
This
work
reports
a
simple
hydrothermal‐ultrasonic
combined
method
construct
conductive
titanium
carbide
quantum
dots
(Ti
3
C
2
QDs)
supported
on
carbon
nanotubes
(CNTs)
QDs@CNTs
composites)
as
efficient
electrocatalysts
for
Li–S
Based
analysis
dynamic
evolutions
Ti
QDs
catalysts
species,
3+
4+
species
can
be
identified
active
that
Li
S
nucleation
dissociation.
Due
abundant
sites
from
QDs,
catalyze
conversion
LiPSs.
Moreover,
CNTs
matrix
significantly
enhance
charge
transport,
allowing
rapid
+
/electron
transfer.
As
result,
QDs@CNTs/S
exhibits
high
initial
capacity,
good
rate
capability,
improved
long‐term
cyclability.
provides
strategy
introduce
into
cathode
battery
achieve
better
electrochemical
performance.
Lithium-sulfur
(Li-S)
batteries
have
emerged
as
one
of
the
most
attractive
alternatives
for
post-lithium-ion
battery
energy
storage
systems,
owing
to
their
ultrahigh
theoretical
density.
However,
large-scale
application
Li-S
remains
enormously
problematic
because
poor
cycling
life
and
safety
problems,
induced
by
low
conductivity
,
severe
shuttling
effect,
reaction
kinetics,
lithium
dendrite
formation.
In
recent
studies,
catalytic
techniques
are
reported
promote
commercial
batteries.
Compared
with
conventional
sites
on
host
materials,
quantum
dots
(QDs)
ultrafine
particle
size
(<10
nm)
can
provide
large
accessible
surface
area
strong
polarity
restrict
excellent
effect
enhance
kinetics
redox
reactions,
well
abundant
lithiophilic
nucleation
regulate
Li
deposition.
this
review,
intrinsic
hurdles
S
conversion
stripping/plating
reactions
first
summarized.
More
importantly,
a
comprehensive
overview
is
provided
inorganic
QDs,
in
improving
efficiency
stability
batteries,
strategies
including
composition
optimization,
defect
morphological
engineering,
design
heterostructures,
so
forth.
Finally,
prospects
challenges
QDs
discussed.
Advanced Science,
Год журнала:
2024,
Номер
unknown
Опубликована: Июль 19, 2024
Integration
of
solar
cell
and
secondary
battery
cannot
only
promote
energy
application
but
also
improve
the
electrochemical
performance
battery.
Lithium-sulfur
(LSB)
is
an
ideal
candidate
for
photoassisted
batteries
owing
to
its
high
theoretical
capacity.
Unfortunately,
researches
related
combination
LSB
are
relatively
lacking.
Herein,
a
freestanding
photoelectrode
developed
lithium-sulfur
(PALSB)
by
constructing
heterogeneous
structured
Au@N-TiO
Inorganic Chemistry Frontiers,
Год журнала:
2023,
Номер
10(19), С. 5719 - 5725
Опубликована: Янв. 1, 2023
Ultrafine
Ni
12
P
5
nanoparticle-embedded
carbon
nanospheres
are
used
as
separator
modifiers
for
Li–S
batteries.
The
uNi
/C//PP
modified
can
effectively
trap
polysulfides
by
polar
interaction
and
enhance
the
kinetic
conversion
of
LiPSs.
Advanced Science,
Год журнала:
2024,
Номер
unknown
Опубликована: Дек. 4, 2024
Abstract
Lithium–sulfur
(Li‐S)
batteries
represent
a
promising
solution
for
achieving
high
energy
densities
exceeding
500
Wh
kg
−1
,
leveraging
cathode
materials
with
theoretical
up
to
2600
.
These
are
also
cost‐effective,
abundant,
and
environment‐friendly.
In
this
study,
an
innovative
approach
is
proposed
utilizing
highly
oxidized
single‐walled
carbon
nanotubes
(Ox‐SWCNTs)
as
conductive
fibrous
scaffold
functional
interlayer
in
sulfur
cathodes
separators,
respectively,
demonstrate
large‐area
ultra‐flexible
Li‐S
enhanced
density.
The
free‐standing
the
cells
exhibit
density
maintaining
806
mAh
g
even
after
100
charge‐discharge
cycles.
Additionally,
oxygen‐containing
groups
on
SWCNTs
significantly
improve
electrochemical
performance
by
promoting
adsorption
of
lithium
polysulfides.
Employing
Ox‐SWCNTs
both
interlayers,
study
achieves
high‐capacity
pouch
that
consistently
deliver
capacity
1.06
Ah
909
over
50
This
strategy
not
only
enhances
but
maintains
excellent
mechanical
flexibility
under
severe
deformation,
positioning
Ox‐SWCNT‐based
architecture
viable,
light‐weight,
storage
suitable
commercializing
rechargeable
batteries.
