Carbon Neutralization,
Год журнала:
2025,
Номер
4(3)
Опубликована: Апрель 13, 2025
ABSTRACT
Sodium‐ion
batteries
have
become
a
significant
research
focus
in
academia.
As
novel
sodium
anode
material,
layered
NbOPO
4
,
consisting
of
octahedral
NbO
6
units
sharing
oxygen
atoms
with
tetrahedral
PO₄
units,
exhibits
stability
due
to
strong
phosphorus‐oxygen
covalent
bonds
that
prevent
loss
from
the
framework.
However,
its
inherently
low
electrical
conductivity
and
sluggish
charge
transfer
kinetics
limit
electrochemical
performance.
To
address
these
challenges,
we
designed
synthesized
vanadium‐doped
niobium
oxyphosphate
coated
reduced
graphene
oxide
(V‐NbOPO
@rGO)
via
microwave
hydrothermal
method
followed
by
calcination.
Vanadium
doping
effectively
modulated
electronic
structure
significantly
enhanced
conductivity,
as
corroborated
density
functional
theory
(DFT)
calculations.
Consequently,
V
0.15
‐NbOPO
@rGO
electrode
demonstrated
exceptional
rate
capability,
achieving
418
mAh
g
−1
at
current
0.1
A
maintaining
reversible
capacity
exceeding
100
even
an
ultrahigh
50
.
Furthermore,
storage
mechanism
was
validated
through
in‐situ
XRD,
TEM,
XPS
analyses.
This
study
provides
effective
strategy
for
improving
performance
based
anodes
deepens
understanding
V‐doped
emphasizing
potential
practical
application
sodium‐ion
batteries.
Advanced Functional Materials,
Год журнала:
2024,
Номер
unknown
Опубликована: Сен. 3, 2024
Abstract
The
intrinsic
low
conductivity,
tap
density,
and
huge
volume
expansion
during
lithium
storage
severely
restrict
the
practicality
of
micron‐silicon
suboxide
(m‐SiO
x
).
Here,
a
carbon
MXene
dual
confinement
dense
structural
engineering
strategy
is
proposed
to
construct
m‐SiO
composites
@C/MXene)
through
in
situ
coating
electrostatic
self‐assembly
process.
This
integrated
achieves
conductivity
157
S
cm
−1
for
@C/MXene,
which
7
2
orders
magnitude
higher
than
(5.3
×
10
−5
)
@C
(2.9
),
respectively.
density
@C/MXene
reaches
1.35
g
−3
,
significantly
greater
that
(0.82
(0.75
29%
much
lower
228%
162%
@C.
synergistic
effect
above
advantages
enables
exhibit
excellent
rate
performance
cycle
stability.
When
assembled
into
full
cell
with
LiFePO
4
(LFP)
cathode,
it
features
high
capacity
retention
energy
99.1%
380
Wh
kg
after
100
cycles
at
0.2
C.
work
provides
new
reference
stable
design
or
other
materials
storage.
Abstract
Sodium‐ion
hybrid
capacitors
(SIHCs)
represent
a
promising
option
for
cost‐effective
grid‐scale
energy
storage
due
to
their
combination
of
high
and
power
densities,
as
well
excellent
cycle
stability.
However,
the
practical
application
SIHCs
is
hindered
by
lack
advanced
anode
materials
that
exhibit
fast
ion
diffusion
kinetics
robust
structures.
Herein,
novel
design
featuring
nano‐sized
Fe
3
O
4
developed,
double‐reinforced
porous
carbon
derived
from
metal‐organic
frameworks
(MOFs)
inner
core
support
N,
P‐co‐doped
polymer
decomposition
outer
shell,
resulting
in
pencil‐like
core–shell
structural
composite
(Fe
/NPC).
The
nanograins
abundant
surface
groups
containing
N
P
reduce
charge/electron
transfer
distance
provide
numerous
pseudocapacitive
active
sites,
guaranteeing
output
superior
rate
capability.
optimized
structure
interconnected
framework
effectively
accommodate
volume
changes,
prevent
nanoparticle
agglomeration,
facilitate
ion/electron
transport,
thereby
ensuring
integrity
rapid
kinetics.
In
testing,
/NPC
demonstrated
cycling
durability,
retaining
86.6%
its
initial
capacity
after
2500
cycles
sodium‐ion
batteries
(SIBs).
Impressively,
assembled
SIHC
achieved
notable
density
147.1
W
h
kg
−1
maintained
92%
8000
cycles.
The Journal of Chemical Physics,
Год журнала:
2025,
Номер
162(7)
Опубликована: Фев. 18, 2025
Carbonaceous
materials
have
demonstrated
extensive
potential
as
anodes
for
sodium
ion
batteries
(SIBs).
Nevertheless,
large-scale
commercial
use
is
severely
hampered
by
the
slow
reaction
kinetics
and
rapid
capacity
fading.
Heteroatom
doping
can
create
abundant
active
sites
to
improve
adsorption
properties
of
carbon
materials.
Here,
we
report
a
novel
nitrogen/boron
co-doped
nanosheet
(NB-CN)
with
N–B
bonds
efficient
Na+
storage.
B-doped
MIL-68
precursor
not
only
achieve
uniform
B
but
also
serve
nitrogen
site
form
bonds.
N,
co-doping
could
promote
improved
hydrophilicity,
while
2D
porous
structure
accelerate
transfer
kinetics.
Benefitting
from
synergistic
effect
dual-doping
hierarchical
porosity,
NB-CN
shows
storage
performance,
displays
high
307.1
mA
h
g−1
in
SIBs
at
0.1
A
g−1,
still
has
reversible
157
4
after
8000
cycles.
Moreover,
assembled
NB-CNs//Na3V2(PO4)3/C
full
cell
exhibits
application
prospect.
This
work
provides
an
insight
designing
dual-doped
high-performance
SIBs.
ACS Applied Materials & Interfaces,
Год журнала:
2025,
Номер
17(9), С. 13928 - 13940
Опубликована: Фев. 24, 2025
Sodium-ion
batteries
(SIBs)
face
challenges
in
practical
applications
due
to
substantial
volume
expansion
of
anode
materials
and
unstable
solid–electrolyte
interphases
(SEIs),
limiting
their
cycling
life,
rate
performance,
reaction
kinetics.
Here,
we
report
the
successful
synthesis
unique
N-doped
carbon-coated
WS2
hexahedral
nanoporous
core–shell
structures
(WS2@NC)
combined
with
a
Na+-solvation
strategy
for
high
capacity
long-life
sodium
storage.
Nanoporous
architecture
facilitates
sufficient
electrolyte
infiltration
buffers
expansion.
The
uniform
carbon
shell
improves
conductivity,
stable
inorganic-rich
SEI
cycle
stability,
Na+-solvent
cointercalation
partially
avoids
desolvation
process
realizes
rapid
Unique
structural
design
excellent
compatibility
electrolytes
give
WS2@NC
electrode
unprecedented
long
life
capability
SIBs
(207.7
mAh
g–1
after
10,000
cycles
at
20
A
343
50
g–1).
This
work
provides
critical
insights
into
performance
enhancement
mechanisms,
offering
crucial
theoretical
basis
SIB
applications.
