ACS Applied Energy Materials,
Год журнала:
2024,
Номер
unknown
Опубликована: Ноя. 18, 2024
Poly(4,4′-biophenylene-1,3,4-oxadiazole)
(b-POD)
is
an
n-type
conductive
polymer
(CP)
with
a
high
specific
capacitance
and
excellent
rate
performance.
However,
its
practical
application
in
pseudocapacitors
hindered
by
severe
cycling
performance
decay.
Electrolytes,
as
crucial
components,
significantly
influence
the
electrochemical
of
pseudocapacitors.
Therefore,
selecting
appropriate
electrolyte
essential
for
improving
stability
b-POD,
thoroughly
investigated
this
study.
Larger
cations
lower
surface
charge
densities
require
smaller
driving
force
injection
into
b-POD
electrode,
resulting
more
positive
doping
potential.
Particularly,
Bu4N+
well-delocalized
electronic
structure
forms
weaker
interaction
negatively
charged
polarons,
facilitating
dissociation
from
thereby
ensuring
good
reversibility
stability.
In
Bu4NBF4
electrolyte,
exhibits
retention
93.2%
after
10
000
cycles,
coupled
Coulombic
efficiency
close
to
100%.
Furthermore,
it
demonstrates
outstanding
performance,
maintaining
272
F
g–1
even
at
20
A
g–1,
which
87.2%
tested
1
g–1.
Finally,
high-performance
asymmetric
pseudocapacitor
energy
power
has
been
fabricated.
This
study
aims
offer
insights
design
next-generation
POD-derived
Advanced Functional Materials,
Год журнала:
2025,
Номер
unknown
Опубликована: Май 2, 2025
Abstract
Graphite
has
been
considered
as
the
most
promising
anode
material
for
potassium‐ion
batteries
(PIBs)
commercialization
due
to
its
high
theoretical
specific
capacity
and
favorable
charge‐discharge
platform.
Nevertheless,
in
conventional
KPF
6
‐based
electrolytes,
practical
implementation
is
hindered
by
sluggish
(K
+
)
transport
through
solid
electrolyte
interphase
(SEI),
leading
poor
rate
capability
inferior
cycling
durability.
A
nanostructured
SiO
2
modification
layer
constructed
on
a
graphite
surface
(SiO
‐Graphite)
regulate
interfacial
kinetics,
which
can
enable
faster
K
diffusion
lower
migration
barrier.
Notably,
‐Graphite
exhibits
initial
Coulombic
efficiency
(84.1%),
excellent
stability
(400
cycles
with
retention
of
71%),
high‐rate
(213
mAh
g
−1
at
current
density
500
mA
electrolyte.
In
addition,
PB||SiO
full
cell
also
demonstrates
good
(90%
after
600
cycles)
performance
(high
2000
),
outperforms
that
previously
reported
PIBs
systems.
This
kinetics
regulation
strategy
provides
new
insights
into
improving
electrodes.
The
solid
electrolyte
interphase
(SEI)
is
intimately
associated
with
the
solvation
structure
in
lithium
metal
batteries
(LMBs),
but
it
difficult
to
incorporate
anions
into
structure.
In
this
work,
bis(trimethylsilyl)
sulfate
(BTMSS)
introduced
as
a
bifunctional
additive
bridge
cation-anion
bond
modulate
and
modify
SEI
composition.
First,
can
simultaneously
complex
Li+
PF6-
form
Li+-BTMSS-PF6-
complex,
thereby
promoting
more
enter
sheath.
Moreover,
BTMSS
has
lower
LUMO
energy
level
(-0.58
eV)
thus
allows
preferential
decomposition
generate
Li2SO3.
dual
function
ultimately
forms
LiF/Li2SO3-rich
SEI.
Consequently,
BTMSS-modified
exhibits
stable
cycling
for
than
600
h
symmetric
cells.
Furthermore,
after
450
cycles
at
1
C,
Li//LiFePO4
(7.13
mg
cm-2)
cell
maintains
80%
capacity
retention.
This
study
presents
an
effective
strategy
advancing
highly
reversible
LMBs.
Advanced Energy Materials,
Год журнала:
2024,
Номер
unknown
Опубликована: Окт. 18, 2024
Abstract
Lithium
iron
phosphate
(LFP)
cathode
is
renowned
for
high
thermal
stability
and
safety,
making
them
a
popular
choice
lithium‐ion
batteries.
Nevertheless,
on
one
hand,
the
fast
charge/discharge
capability
fundamentally
constrained
by
low
electrical
conductivity
anisotropic
nature
of
sluggish
lithium
ion
(Li
+
)
diffusion.
On
other
interface
internal
structural
degradation
occurs
when
subjected
to
high‐rate
condition.
Herein,
multifunctional
boron‐doping
graphene/lithium
carbonate
(BG/LCO)
nanointerfacial
layer
surface
commercial
LiFePO
4
particles
designed,
in
which
BG
catalyzes
rapid
reaction
Li
2
CO
3
‐LiPF
6
homogeneous
mechanically
robust
inorganic
LiF‐rich
structure
across
cathode‐electrolyte
interphase
(CEI),
forms
conductive
network
significantly
enhance
both
electron
transport,
strengthens
FeO
bonding
minimize
Fe
loss
formation
Fe‐Li
antisite
defects.
Correspondingly,
modified
LFP
achieves
113.2
mAh
g
−1
at
10
C
extraordinary
cyclic
with
88.0%
capacity
retention
over
1000
cycles
as
compared
pristine
only
94.0
64.6%
retention.
It
also
exhibits
great
enhancements
20.1%
3.7%
higher‐rate
condition
(room
temperature/15
C)
temperature
(−10
°C/1
C),
respectively.
ACS Applied Energy Materials,
Год журнала:
2024,
Номер
unknown
Опубликована: Ноя. 18, 2024
Poly(4,4′-biophenylene-1,3,4-oxadiazole)
(b-POD)
is
an
n-type
conductive
polymer
(CP)
with
a
high
specific
capacitance
and
excellent
rate
performance.
However,
its
practical
application
in
pseudocapacitors
hindered
by
severe
cycling
performance
decay.
Electrolytes,
as
crucial
components,
significantly
influence
the
electrochemical
of
pseudocapacitors.
Therefore,
selecting
appropriate
electrolyte
essential
for
improving
stability
b-POD,
thoroughly
investigated
this
study.
Larger
cations
lower
surface
charge
densities
require
smaller
driving
force
injection
into
b-POD
electrode,
resulting
more
positive
doping
potential.
Particularly,
Bu4N+
well-delocalized
electronic
structure
forms
weaker
interaction
negatively
charged
polarons,
facilitating
dissociation
from
thereby
ensuring
good
reversibility
stability.
In
Bu4NBF4
electrolyte,
exhibits
retention
93.2%
after
10
000
cycles,
coupled
Coulombic
efficiency
close
to
100%.
Furthermore,
it
demonstrates
outstanding
performance,
maintaining
272
F
g–1
even
at
20
A
g–1,
which
87.2%
tested
1
g–1.
Finally,
high-performance
asymmetric
pseudocapacitor
energy
power
has
been
fabricated.
This
study
aims
offer
insights
design
next-generation
POD-derived
