Energy & Fuels,
Journal Year:
2024,
Volume and Issue:
38(17), P. 16957 - 16965
Published: Aug. 22, 2024
Nanoporous
carbon
materials
have
attracted
considerable
attention
as
highly
promising
anodes
for
lithium-ion
batteries
(LIBs)
and
sodium-ion
(SIBs).
In
this
work,
N-doped
nanoporous
(NPC)
particles
with
different
sizes
are
synthesized
from
metal–organic
frameworks
(MOFs)
through
a
straightforward
process.
When
applied
anode
LIBs
SIBs,
these
NPCs
exhibit
excellent
performance
in
the
storage
of
Li+
Na+
ions.
For
LIBs,
NPC
an
average
diameter
200
nm
demonstrate
retained
capacities
1503
mAh
g–1
at
0.1
mA
after
100
cycles
738
2
A
1000
cycles.
50
high
508
500
238.5
5
The
electrochemical
both
SIBs
is
mainly
attributed
to
small
size,
nitrogen-containing,
mesoporous,
microporous
features.
These
findings
indicate
that
derived
MOFs
offer
effective
synthesis
method
expand
application
potential
carbon-based
materials.
Small,
Journal Year:
2024,
Volume and Issue:
20(43)
Published: July 7, 2024
Abstract
Metal
phosphides
with
easy
synthesis,
controllable
morphology,
and
high
capacity
are
considered
as
potential
anodes
for
sodium‐ion
batteries
(SIBs).
However,
the
inherent
shortcomings
of
metal
phosphating
materials,
such
conductivity,
kinetics,
volume
strain,
etc
not
satisfactory,
which
hinders
their
large‐scale
application.
Here,
a
CoP@carbon
nanofibers‐composite
containing
rich
Co─N─C
heterointerface
phosphorus
vacancies
grown
on
carbon
cloth
(CoP
1‐x
@MEC)
is
synthesized
SIB
anode
to
accomplish
extraordinary
ultra‐long
cycle
life.
The
hybrid
composite
nanoreactor
effectively
impregnates
defective
CoP
active
reaction
center
while
offering
layer
buffer
expansion
during
charge–discharge
process.
These
vast
interfaces,
favored
electrolyte
infiltration,
well‐structured
ion‐electron
transport
network
synergistically
improve
Na
+
storage
electrode
kinetics.
By
virtue
these
superiorities,
@MEC
binder‐free
delivers
superb
SIBs
performance
including
areal
(2.47
mAh
cm
−2
@0.2
mA
),
rate
capability
(0.443
@6
long
cycling
stability
(300
cycles
without
decay),
thus
holding
great
promise
inexpensive
anode‐based
practical
applications.
ACS Applied Materials & Interfaces,
Journal Year:
2024,
Volume and Issue:
16(17), P. 22055 - 22065
Published: April 18, 2024
Nb2O5
has
been
viewed
as
a
promising
anode
material
for
lithium-ion
batteries
by
virtue
of
its
appropriate
redox
potential
and
high
theoretical
capacity.
However,
it
suffers
from
poor
electric
conductivity
low
ion
diffusivity.
Herein,
we
demonstrate
the
controllable
fabrication
Cu-doped
with
orthorhombic
(T-Nb2O5)
monoclinic
(H-Nb2O5)
phases
through
annealing
solvothermally
presynthesized
precursor
under
different
temperatures
in
air,
Cu
doping
amount
can
be
readily
controlled
concentration
solution,
whose
effect
on
lithium
storage
behaviors
is
thoroughly
investigated.
H-Nb2O5
shows
obvious
peaks
(Nb5+/Nb4+
Nb4+/Nb3+)
much
higher
capacity
better
cycling
stability
than
those
widely
investigated
T-Nb2O5.
When
introducing
doping,
optimized
H-Cu0.1-Nb2O5
electrode
greatly
enhanced
lower
diffusion
barrier
revealed
calculations
electrochemical
characterizations,
delivering
reversible
203.6
mAh
g-1
retention
140.8
after
5000
cycles
at
1
A
g-1,
initial
Coulombic
efficiency
91%
rate
144.2
4
g-1.
As
demonstration
full-cell
application,
H-Cu0.1-Nb2O5||LiFePO4
cell
displays
good
performance,
exhibiting
135
200
0.2
More
importantly,
this
work
offers
new
synthesis
protocol
phase
improved
reaction
kinetics.
