The
rate
performance
of
biomass-based
hard
carbon
has
always
been
one
the
obstacles
to
its
large-scale
use.
There
are
various
challenges
in
improving
rapid
conduction
sodium
ions
at
interface
and
realizing
efficient
utilization
inactive
large
current.
In
this
study,
a
disorder-in-ordered
nanostructure
front-face
coated
with
which
forms
heterogeneous
is
prepared
by
coulomb
adsorption
methylene
blue
alkalized
kapok
fiber.
A
study
on
material
formation
proposed
incorporating
heteroatoms
different
carbonization
temperatures.
When
current
density
increases
10
g
Due
to
its
unique
structure
and
high
capacity,
bamboo-based
hard
carbon
is
often
regarded
as
the
most
promising
anode
material
for
sodium-ion
batteries.
However,
low
sodium
storage
ability
poor
Na+
transportation
limit
development
of
bamboo-derived
carbon.
In
this
study,
bamboo
powder
(BP)
was
pretreated
with
acidic
potassium
permanganate,
in
which
strong
oxidizing
properties
introduced
more
oxygen-containing
functional
groups
into
skeleton.
addition,
two-step
carbonization
process
facilitated
formation
hierarchical
pore
structures
(BP-A-P).
Electrochemical
measurements
demonstrated
that
BP-A-P
exhibited
superior
activity
stability.
Under
current
multiplication
0.1
C,
a
reversible
specific
capacity
338
mAh/g
achieved
first
Coulombic
efficiency
81.7%.
The
excellent
performance
mainly
attributed
rich
micropores
abundant
closed
pores,
are
induced
by
permanganate.
Moreover,
exhibits
stability
maintained
at
273
after
100
cycles.
Thus,
permanganate
treatment
provides
new
strategy
achieving
complex
pores
high-performance
Advanced Functional Materials,
Год журнала:
2025,
Номер
unknown
Опубликована: Апрель 15, 2025
Abstract
The
inevitable
graphitization
of
bituminous
coal
during
carbonization
suppresses
its
application
as
a
carbon
anode
precursor
for
sodium‐ion
batteries
(SIBs).
In
this
paper,
heterogeneous
cross‐linking
strategy
is
proposed
to
regulate
the
microstructure
coal‐based
carbon.
experimental
results
display
that
C(O)‐O
structure
generated
by
oxygen‐containing
groups
between
and
theabrownin
plays
steric
hindrance
effect
on
inhibiting
long‐range
ordered
development
graphite
microcrystals.
prepared
possesses
large
interlayer
spacing
ample
closed
pores.
As
SIBs,
as‐obtained
BTC‐10%
releases
an
eminent
initial
reversible
capacity
290
mAh
g
−1
with
coulombic
efficiency
72.7%.
Its
low‐voltage
(<0.1
V)
plateau
discharge
high
239
.
addition,
series
electrochemical
measurements
characterization
reveals
sodium
storage
mainly
originates
from
intercalation
Na
+
into
pseudo‐graphite
layer
filling
pores
in
region.
This
work
supplies
effective
pathway
developing
high‐performance
attractive‐cost
anodes
SIBs.
