Nanoscale,
Journal Year:
2025,
Volume and Issue:
unknown
Published: Jan. 1, 2025
Pitch-derived
hard
carbon
materials
are
considered
one
of
the
most
promising
anodes
for
sodium-ion
batteries
(SIBs)
due
to
their
low
cost
and
high
yields.
However,
they
largely
limited
by
inferior
specific
capacity
rate
capability,
resulting
from
easy
graphitization
pitch
precursor
during
high-temperature
carbonization.
Herein,
a
simple
bromination
modification
coupled
with
pyrolysis
strategy
was
proposed
fabricate
pitch-derived
(BHC-x),
aiming
engineer
microstructure
optimize
electrochemical
performance
SIBs.
The
detailed
experimental
investigations
demonstrated
that
brominated
obtained
via
hydrothermal
treatment
underwent
cross-linking
polycondensation
in
presence
bromine
species
at
350
°C,
thereby
forming
unique
disordered
closed
structure
process.
As
result,
optimized
BHC-1500,
rich
defect
sites
suitable
interlayer
spacing
0.358
nm,
exhibited
reversible
250.0
mA
h
g-1
0.1
A
an
initial
coulombic
efficiency
(ICE)
79.8%.
It
still
maintained
150.0
5
g-1,
outperforming
unbrominated
counterparts
(152.1
g-1).
This
work
proposes
new
insights
into
optimization
pitch-based
high-performance
Angewandte Chemie International Edition,
Journal Year:
2024,
Volume and Issue:
unknown
Published: Aug. 21, 2024
The
closed
pores
play
a
critical
role
in
improving
the
sodium
storage
capacity
of
hard
carbon
(HC)
anode,
however,
their
formation
mechanism
as
well
efficient
modulation
strategy
at
molecular
level
polymer-derived
HCs
is
still
lacking.
In
this
work,
steric
hindrance
effect
has
been
proposed
to
create
for
first
time
through
grafting
aromatic
rings
within
and
between
main
chains
precursor.
experimental
data
theoretical
calculation
demonstrate
that
steric-hindrance
from
ring
side
group
can
increase
backbone
rigidity
internal
free
volumes
polymer
precursor,
which
prevent
over
graphitization
facilitate
during
carbonization
process.
As
result,
as-prepared
HC
anode
exhibits
remarkably
enhanced
discharge
340.3
mAh/g
0.1
C,
improved
rate
performance
(210.7
5
C)
boosted
cycling
stability
(86.4
%
1000
cycles
2
C).
This
work
provides
new
insight
into
mechanisms
via
engineering,
shed
light
on
development
high-performance
sodium-ion
batteries.
Nano-Micro Letters,
Journal Year:
2024,
Volume and Issue:
17(1)
Published: Oct. 4, 2024
Abstract
Na
3
V
2
(PO
4
)
(NVP)
has
garnered
great
attentions
as
a
prospective
cathode
material
for
sodium-ion
batteries
(SIBs)
by
virtue
of
its
decent
theoretical
capacity,
superior
ion
conductivity
and
high
structural
stability.
However,
the
inherently
poor
electronic
sluggish
diffusion
kinetics
NVP
give
rise
to
inferior
rate
performance
unsatisfactory
energy
density,
which
strictly
confine
further
application
in
SIBs.
Thus,
it
is
significance
boost
sodium
storage
material.
Up
now,
many
methods
have
been
developed
optimize
electrochemical
In
this
review,
latest
advances
optimization
strategies
improving
are
well
summarized
discussed,
including
carbon
coating
or
modification,
foreign-ion
doping
substitution
nanostructure
morphology
design.
The
highlighted,
involving
Na,
V,
PO
3−
sites,
include
single-site
doping,
multiple-site
single-ion
multiple-ion
so
on.
Furthermore,
challenges
prospects
high-performance
also
put
forward.
It
believed
that
review
can
provide
useful
reference
designing
developing
toward
large-scale
Advanced Materials,
Journal Year:
2024,
Volume and Issue:
unknown
Published: Oct. 30, 2024
Abstract
The
closed‐pore
structure
of
hard
carbons
holds
the
key
to
high
plateau
capacity
and
rapid
diffusion
kinetics
when
applied
as
sodium‐ion
battery
(SIB)
anodes.
However,
understanding
establishing
structure‐electrochemistry
relationship
still
remains
a
significant
challenge.
This
work,
for
first
time,
introduces
an
innovative
deep
eutectic
solvent
(DES)
cell‐shearing
strategy
precisely
tailor
cell
natural
bamboo
consequently
in
its
derived
carbons.
DES
shearing
force
effectively
modifies
pore
architecture
by
simultaneously
dissolving
amorphous
components
form
closed
cores
with
adjustable
sizes,
well
disintegrating
crystalline
cellulose
through
generation
competing
hydrogen
bonds
elaborately
tune
wall
thickness
ordering.
optimized
featuring
appropriate
size
(∼2
nm)
ultra‐thin
(1–3
layers)
disordered
walls,
exhibits
abundant
active
sites
delivers
ion
reaction
reversibility.
Consequently,
reversible
422
mAh
g
−1
at
30
mA
along
exceptional
rate
capability
(318.6
6
A
)
are
achieved,
outperforming
almost
all
previous
reported
new
concept
chemistry
regeneration
significantly
advances
applications
biomass
materials
energy
storage.
