ACS Applied Energy Materials,
Год журнала:
2024,
Номер
7(14), С. 5977 - 5985
Опубликована: Июль 11, 2024
Metal–organic
frameworks
(MOFs)
have
received
extreme
attention
for
their
applications
in
lithium-ion
batteries
due
to
large-specific
surface
area
and
adjustable
composition.
However,
the
limited
active
sites
low-ion
diffusion
of
MOF
limit
its
practical
applications.
In
this
article,
coordination
structure
SA–Cu–SQ
is
modulated
by
partially
substituting
acetic
acid
squaric
(SQ),
thereby
creating
unsaturated
exposing
some
metal's
sites.
The
electrochemical
tests
show
that
introduction
enables
possess
a
higher
capacity
(1012.5
mA
h
g–1
after
100
cycles
at
0.1
A
g–1)
than
Cu–SQ.
Furthermore,
kinetic
ex-situ
characterization
indicate
not
only
facilitates
Li+
but
also
generates
additional
Further
introducing
strategy
into
rhodizonic
(RA)
gave
SA–Cu–RA,
which
obtained
1126.9
g–1.
This
work
provides
avenues
construct
high-performance
materials.
Electrochemical
reconstruction
(ER)
is
crucial
for
optimizing
aqueous
electrode
materials,
yet
the
underlying
regulatory
mechanisms
remain
largely
unexplored.
In
this
study,
we
developed
a
stepwise
ER
technique
encompassing
both
pre-ER
and
sub-ER
stages
to
enhance
performance
of
Bi-based
anode
materials.
During
process,
uncovered
influence
Bi-ion
concentration
in
electrolyte
on
process.
This
regulation
led
distinct
dynamic
evolution
significantly
superior
electrochemical
compared
unregulated
samples.
charge
discharge
cycling,
regulated
sample
exhibited
complex
but
remarkably
stable
characterized
by
reversible
morphological
from
rigid
nanoflakes
flexible
rods-a
transformation
akin
blooming
closing
flowers.
ER-induced
rigid-to-flexible
materials
enhanced
compatibility
with
redox
reactions,
achieving
rate
capability
88.7%
capacity
retention
at
20
A
g-1
ultralong
cyclability
103.4%
after
7000
cycles.
marks
pioneering
achievement
controllable
process
paves
new
path
towards
rationally
exploring
material.
Advanced Energy Materials,
Год журнала:
2024,
Номер
unknown
Опубликована: Дек. 26, 2024
Abstract
Optimizing
electrochemical
kinetics
by
regulation
ion/charge
transfer
efficiency
and
stabilizing
the
electrode
structure
of
materials
is
crucial
to
maximize
rapid
charging
long
cycling
sodium‐ion
storage.
Herein,
VS
2
/Bi
S
3
spring‐type
heterointerfaces
hollow
microspheres
with
spatial
confinement
sulfur
vacancy
defects
are
synthesized
as
a
fast‐charging
anode
for
hybrid
capacitors
(SIHCs).
The
experimental
studies
coupled
density
functional
theory
calculations
verify
that
strong
coupling
between
Bi
induces
stable
built‐in
electric
field,
largely
promoting
charge
efficiency.
Sulfur
at
produce
additional
pseudocapacitive
storage,
which
improves
reversible
capacity
large‐rate
fast
performance
electrode.
Finite
element
analysis
in
situ
expansion
test
confirm
heterostructured
formed
flat‐morphology
zigzag‐morphology
stacking
mitigate
lattice
contraction
during
insertion/extraction,
accommodate
mechanical
stresses,
maintain
integrity
heterojunction
interface.
When
employed
coin
SIHC,
it
achieves
high
energy/power
135
Wh
kg
−1
/22
kW
,
an
ultralong
life
50
000
cycles;
assembled
pouch
SIHC
(1
Ah)
demonstrates
specific
energy
120
10
C,
95.5%
retention
after
1000
cycles.
Molecules,
Год журнала:
2024,
Номер
29(13), С. 2996 - 2996
Опубликована: Июнь 24, 2024
Rechargeable
potassium
ion
batteries
have
long
been
regarded
as
one
alternative
to
conventional
lithium
because
of
their
resource
sustainability
and
cost
advantages.
However,
the
compatibility
between
anodes
electrolytes
remains
be
resolved,
impeding
commercial
adoption.
In
this
work,
K-ion
storage
properties
Bi
nanoparticles
encapsulated
in
N-doped
carbon
nanocomposites
examined
two
typical
electrolyte
solutions,
which
show
a
significant
effect
on
insertion/removal
processes.
KFSI-based
electrolyte,
N-C@Bi
exhibit
high
specific
capacity
255.2
mAh
g−1
at
0.5
A
g−1,
245.6
after
50
cycles,
corresponding
retention
rate
96.24%.
KPF6-based
209.0
71.5
an
inferior
only
34.21%.
Post-investigations
reveal
formation
KF
interphase
derived
from
salt
decomposition
intact
rod-like
morphology
cycling
K2
electrolytes,
are
responsible
for
better
properties.
ACS Applied Energy Materials,
Год журнала:
2024,
Номер
7(14), С. 5977 - 5985
Опубликована: Июль 11, 2024
Metal–organic
frameworks
(MOFs)
have
received
extreme
attention
for
their
applications
in
lithium-ion
batteries
due
to
large-specific
surface
area
and
adjustable
composition.
However,
the
limited
active
sites
low-ion
diffusion
of
MOF
limit
its
practical
applications.
In
this
article,
coordination
structure
SA–Cu–SQ
is
modulated
by
partially
substituting
acetic
acid
squaric
(SQ),
thereby
creating
unsaturated
exposing
some
metal's
sites.
The
electrochemical
tests
show
that
introduction
enables
possess
a
higher
capacity
(1012.5
mA
h
g–1
after
100
cycles
at
0.1
A
g–1)
than
Cu–SQ.
Furthermore,
kinetic
ex-situ
characterization
indicate
not
only
facilitates
Li+
but
also
generates
additional
Further
introducing
strategy
into
rhodizonic
(RA)
gave
SA–Cu–RA,
which
obtained
1126.9
g–1.
This
work
provides
avenues
construct
high-performance
materials.
