Macromolecular Rapid Communications,
Год журнала:
2025,
Номер
unknown
Опубликована: Апрель 10, 2025
Abstract
Lithium–sulfur
batteries
(LSBs)
are
considered
as
one
of
the
most
promising
next‐generation
energy‐storage
devices
because
their
high
energy
density.
However,
long‐term
use
LSBs
is
mainly
limited
by
polysulfide
shuttling
and
cathode
structural
degradation
caused
volume
changes
during
charging
discharging.
To
address
these
issues,
a
multifunctional,
high‐performance
aqueous
binder
developed
modifying
natural
polysaccharide
with
multi‐walled
carbon
nanotubes
(MWCNTs).
Specifically,
catechol‐conjugated
chitosan
(CCS)
acts
binder,
showing
strong
adsorption,
while
MWCNTs
covalently
bonded
to
CCS
enhance
mechanical
toughness
electronic
conductivity.
The
resulting
CCS‐MWCNTs
composite
exhibits
tensile
strength
40
MPa
strain
at
break
300%,
which
higher
than
those
CCS.
As
for
sulfur
cathodes,
demonstrates
superior
cyclic
stability
rate
capability.
At
loading
2.0
mg
cm⁻
2
,
it
delivers
an
initial
capacity
1016
mAh
g⁻¹
0.2
C
retains
690
after
100
cycles,
significantly
outperforming
commercial
polyvinylidene
difluoride
(PVDF),
sodium
carboxymethylcellulose/styrene
butadiene
rubber
(CMC/SBR),
binders.
This
study
potential
applications
binders
in
metal‐sulfur
innovatively
incorporating
into
biopolymer
providing
alternative
environmentally
friendly
storage.
ACS Applied Polymer Materials,
Год журнала:
2024,
Номер
6(10), С. 5910 - 5919
Опубликована: Май 9, 2024
With
the
depletion
of
fossil
energy
and
increasingly
serious
environmental
pollution,
development
renewable
sources
is
imminent.
Exploration
high-efficiency
storage
transformation
materials
has
become
focus
in
field
research.
Covalent
organic
frameworks
(COFs),
as
a
kind
porous
crystalline
polymer,
have
attracted
extensive
attention.
In
this
work,
we
developed
composite
material
(Al2O3-G-COFSO3)
using
COFs
alumina,
which
can
serve
an
efficient
separator
lithium–sulfur
(Li–S)
batteries.
composite,
alumina
improve
transport
ability
Li+
thus
conductivity
SO3–COF
effectively
restrain
shuttle
polysulfides
by
electrostatic
repulsion.
At
current
density
0.05C,
composite-based
battery
exhibited
high
capacity
1404
mAh
g–1,
ranks
one
highest
values
among
all
COF-based
Li–S
Even
at
discharge
rate
1C,
it
also
achieve
experimental
999
g–1
with
low
decay
0.061%
over
500
cycles.
Moreover,
showed
electrochemical
stability
long-term
performance
stability.
ACS Applied Materials & Interfaces,
Год журнала:
2025,
Номер
unknown
Опубликована: Фев. 15, 2025
As
the
demand
for
safer
lithium
batteries
grows,
quality
of
solid
electrolytes,
a
critical
component
solid-state
(SSLBs)
construction,
has
become
increasingly
important.
SSLBs
typically
underperform
compared
to
conventional
with
liquid
electrolytes.
In
this
study,
two
ceramic-based
composite
electrolytes
(CSEs)
differing
dispersion
qualities
were
prepared,
consisting
dispersion-treated
and
as-received
Li6.4La3Zr1.4Ta0.6O12
(LLZTO)
particles
within
poly(vinylidene
fluoride-co-hexafluoropropylene)
(PVDF-HFP)
matrix.
These
CSEs
assembled
sulfur
cathode
into
lithium–sulfur
(SSLSBs)
assessed
using
electrochemical
impedance
spectroscopy
distribution
relaxation
times
investigate
factors
affecting
battery
performance.
To
clarify
individual
contributions
anode,
three-electrode
configuration
was
employed,
allowing
more
detailed
understanding
internal
processes
SSLSBs.
Additional
techniques,
including
current
density
testing,
in
situ
optical
microscopy
dendrite
observation,
finite
element
simulations,
utilized
evaluate
impact
LLZTO
PVDF-HFP
uniformity
on
electrolyte
cell
performances.
Results
reveal
that
low-quality
led
uneven
charge
transport
increased
formation
during
cycling,
significantly
reducing
lifespan.
Importantly,
while
can
mitigate
shuttle
effect,
uncontrolled
growth
emerged
as
primary
cause
capacity
decline
failure
batteries.
Chemical bulletin.,
Год журнала:
2025,
Номер
7(3), С. 64 - 77
Опубликована: Март 12, 2025
в
данной
работе
исследован
процесс
электрохимического
получения
диоксида
марганца
из
10%
сернокислого
электролита
выщелачивания
активной
массы
отработанных
марганцево-цинковых
химических
источников
тока.
Актуальность
темы
обусловлена
широким
применением
MnO2
современной
промышленности
и
необходимостью
разработки
эффективных
методов
его
вторичного
сырья.
Цель
исследования
состояла
изучении
влияния
температуры
ультразвукового
воздействия
на
свойства
размеры
частиц
получаемого
марганца.
Методика
эксперимента
включала
электролиз
трехэлектродной
ячейке
при
варьировании
от
30°С
до
90°С
плотности
тока
3-5
А/дм2.
Ультразвуковая
обработка
осуществлялась
частоте
20
кГц.
Полученные
образцы
исследовались
методами
сканирующей
электронной
микроскопии
рентгеновского
энергодисперсионного
анализа.
Результаты
показали,
что
повышение
ведет
к
росту
размеров
0.2
5-10
мкм.
Введение
ультразвука
позволяет
получать
высокодисперсный
с
размерами
кристаллитов
менее
50
нм.
Максимальный
выход
по
току
(92%)
обеспечивается
60°С
5
Практическая
значимость
работы
связана
возможностью
наноструктурированного
улучшенными
электрохимическими
характеристиками
отработанного
Дальнейшие
будут
направлены
оптимизацию
параметров
электролиза
ультразвуковой
обработки
для
управления
морфологией
свойствами
MnO2.
this
paper
investigates
the
process
of
electrochemical
production
manganese
dioxide
from
a
sulfuric
acid
electrolyte
leaching
active
mass
spent
manganese-zinc
chemical
power
sources.
The
relevance
topic
is
due
to
wide
application
in
modern
industry
and
need
develop
efficient
methods
for
obtaining
it
secondary
raw
materials.
aim
study
was
examine
influence
temperature
ultrasonic
treatment
on
properties
sizes
obtained
particles.
experimental
methodology
included
electrolysis
three-electrode
cell
with
variation
30°C
90°C
current
density
A/dm2.
Ultrasonic
carried
out
at
frequency
kHz.
samples
were
studied
using
scanning
electron
microscopy
X-ray
energy-dispersive
analysis.
results
showed
that
increasing
leads
an
increase
size
particles
microns.
introduction
ultrasound
allows
highly
dispersed
crystallite
less
than
nm.
maximum
yield
achieved
60°C
practical
significance
work
associated
possibility
nanostructured
improved
characteristics
Further
research
will
be
aimed
optimizing
parameters
control
morphology
