ACS Applied Materials & Interfaces,
Год журнала:
2025,
Номер
unknown
Опубликована: Март 3, 2025
Coal-based
carbons
have
garnered
interest
as
cost-effective
anodes
for
sodium-ion
batteries
(SIBs)
owing
to
their
widespread
availability
and
economic
practicality.
However,
the
inherent
limitations
in
microstructure,
including
insufficient
active
sites
Na-ion
storage,
restrict
potential
high-performance
applications.
Herein,
a
pitch-assisted
coating
treatment
through
confined
carbonization
is
employed
transform
open
micropores
coal-based
activated
carbon
into
closed
pores,
resulting
more
compact
efficient
storage.
Complementary
ex
situ
Raman
X-ray
photoelectron
spectroscopy
analyses
elucidate
that
Na
filling
within
pores
significantly
influences
low-voltage
plateau
capacity,
validating
critical
role
of
enhancing
sodium
storage
efficiency.
The
engineered
demonstrate
capacity
290.0
mAh
g-1
an
initial
coulombic
efficiency
78.0%,
along
with
exceptional
cycling
stability
rate
performance.
In
combination
O3-NaNi1/3Fe1/3Mn1/3O2
cathode,
assembled
full
cell
achieves
remarkable
energy
density
251.2
Wh
kg-1,
determined
by
using
total
mass
cathode
anode.
This
work
provides
novel
perspectives
on
structural
engineering
materials,
establishing
foundation
commercialization
SIBs.
ACS Nano,
Год журнала:
2024,
Номер
18(18), С. 11941 - 11954
Опубликована: Апрель 23, 2024
Closed
pores
play
a
crucial
role
in
improving
the
low-voltage
(<0.1
V)
plateau
capacity
of
hard
carbon
anodes
for
sodium-ion
batteries
(SIBs).
However,
lack
simple
and
effective
closed-pore
construction
strategies,
as
well
unclear
formation
mechanism,
has
severely
hindered
development
high
anodes.
Herein,
we
present
an
strategy
by
one-step
pyrolysis
zinc
gluconate
(ZG)
elucidate
corresponding
mechanism
formation.
The
during
ZG
mainly
involves
(i)
precipitation
ZnO
nanoparticles
etching
on
under
1100
°C
to
generate
open
0.45-4
nm
(ii)
graphitic
domains
shrinkage
partial
at
1100-1500
convert
closed
pores.
Benefiting
from
considerable
content
suitable
microstructure,
optimized
achieves
ultrahigh
reversible
specific
481.5
mA
h
g
Journal of Materials Chemistry A,
Год журнала:
2024,
Номер
12(20), С. 12015 - 12025
Опубликована: Янв. 1, 2024
Closed
pore
architectures
with
exceptional
Na-storage
performance
have
been
successfully
fabricated
from
ultra-micropores
the
assistance
of
polypropylene.
Advanced Energy Materials,
Год журнала:
2024,
Номер
14(24)
Опубликована: Апрель 1, 2024
Abstract
Hard
carbon
(HC)
is
subjected
to
low
initial
Coulombic
efficiency
(ICE)
and
unsteady
solid
electrolyte
interphase
(SEI),
which
limits
the
energy
density
cycling
performance.
Meanwhile,
studies
related
emerging
chemical
presodiation
have
specifically
focused
on
proper
redox
potential
overlooked
its
safety
hazard.
To
address
these
drawbacks
of
HC
presodiation,
a
series
high‐safety
solutions
based
tetraethylene
glycol
dimethyl
ether
(TEGDME)
are
proposed
for
uniform
fast
Bi
anodes.
Among
them,
Na‐4‐methylbiphenyl
in
TEGDME
solution
exhibits
lowest
(0.146
V
vs
Na
+
/Na),
achieves
inhibition
irreversible
sodium
uptake.
Meantime,
potential‐driven
decomposition
fluoroethylene
carbonate
endows
presodiated
(pNa‐HC)
fast‐ion
conducting
robust
F‐rich
SEI.
Accordingly,
pNa‐HC
delivers
an
ideal
ICE
99.1%
compared
(65.28%).
significantly
enhanced
rate
performance
life
(193.39
mAh
g
−1
after
2300
cycles
at
1000
mA
)
benefiting
from
reduced
kinetic
barriers.
When
pairs
with
3
2
(PO
4
cathode,
full
cell
demonstrates
desirable
91.25%.
This
work
provides
novel
universal
solvent
design
strategy
realize
pre‐metallation.
Abstract
Hard
carbon
(HC)
materials
are
suitable
anodes
for
sodium‐ion
batteries
(SIBs)
but
still
suffer
from
insufficient
initial
Coulombic
efficiency
(ICE).
Promoting
sodium
storage
via
the
pore
filling
mechanism
is
an
effective
way
to
improve
ICE,
and
key
here
regulating
structures
of
HC.
In
this
work,
coal‐derived
HC
successfully
engineered
with
abundant
accessible
closed
nanopores
by
treating
coal
precursors
a
facile
destructive
oxidation
strategy.
Investigations
demonstrate
that
strategy
can
not
only
introduce
oxygen‐containing
functional
groups
(OFGs)
also
decrease
size
graphitic
microcrystals.
Thus,
OFGs
significantly
enhance
crosslinking
small
microcrystals
stimulate
formation
during
carbonization,
which
eventually
improves
ICE
promoting
mechanism.
The
optimized
exhibits
so
far
highest
(92.2%)
among
SIB
anode
materials,
together
considerable
capacity
328.5
mAh
g
−1
at
90
mA
retention
95.1%
after
150
cycles.
results
provide
guidelines
developing
high‐performance
toward
large‐scale
application
SIBs,
great
significance
future
energy
systems.
Advanced Functional Materials,
Год журнала:
2025,
Номер
unknown
Опубликована: Фев. 24, 2025
Abstract
The
trade‐off
between
initial
coulombic
efficiency
(ICE)
and
rate
performance
of
hard
carbon
anodes
remains
a
challenge
in
their
practical
applications,
which
is
highly
related
to
complex
active
surface
porous
properties.
In
this
work,
high‐performance
anode
prepared
using
xylose
as
the
source
with
Co
2+
‐assisted
catalysis,
exhibits
an
excellent
91.6%,
high
capacity
396.4
mA
h
g
−1
,
superior
(176.3
at
5
A
),
outstanding
cycling
stability.
Cobalt‐ion
treatment
forms
“expanded”
graphite
segments,
facilitating
intercalation
desolvated
sodium
ions.
Additionally,
intersection
these
segments
creates
“nanocaves”,
enabling
rapid
sodium‐ion
transport
stage.
Using
combination
atomic‐resolution
structural
characterization
three‐dimensional
electron
tomography
via
transmission
microscopy,
it
observed
that
initially
isolated
nanoporous
holes
collapsed
into
interconnected
pancake‐like
pores
during
later
cycling.
reconstructed
narrow
but
connected
pore
structure
provides
abundant
storage
sites
charge
transfer
pathways,
effectively
accommodating
stress
This
work
presents
innovative
strategy
for
designing
commercial
advanced
architectures
also
new
insight
evolution
