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:
2024,
Номер
unknown
Опубликована: Авг. 5, 2024
Abstract
The
unstable
solid
electrolyte
interface
(SEI)
formed
on
the
surface
of
Li
metal
can
induce
dendrite
growth,
resulting
in
capacity
fading,
battery
short
circuit,
and
other
problems,
thus
hindering
practical
application
battery.
In
order
to
obtain
stable
effective
SEI,
it
is
an
strategy
construct
ideal
artificial
SEI
(ASEI)
by
regulating
composition
structure
interface.
Among
inorganic
materials
used
construction
ASEI,
carbon
quantum
dots
(CQDs)
stand
out
as
promising
material
due
their
small
size
abundant
active
sites.
Herein,
benefiting
from
fluidity,
smoothness,
high
reactivity
liquid
metal,
combined
with
use
N‐doped
CQDs
dispersing
particles,
a
modification
method
achieve
uniform
dispersion
particles
within
proposed.
This
technique
offers
low‐cost
solution
for
achieving
little
quantities
(single
dose
<
0.1
mg
cm
−2
)
while
ensuring
enhanced
adhesion
realize
dense,
strong
ASEI.
corresponding
symmetrical
cells
show
lower
voltage
polarization
outstanding
cycling
stability
than
bare
electrode.
