In
Li-O2
batteries,
Li2O2
serves
as
the
primary
cathodic
material
but
its
wide
band
gap
imparts
insulating
properties.
Regulating
composition
and
morphology
of
enables
construction
a
novel
structure
with
exceptional
electrochemical
performance.
Herein,
we
introduce
an
organic
salt
containing
cobalt
ions,
acetylacetonate
(Co(acac)2),
into
electrolyte.
We
exploit
cation
migration
characteristics
under
electric
field
to
facilitate
generation
decomposition
Co-doped
Li2O2,
achieving
gradient
control
optimized
growth
Li2O2.
Moreover,
Co(acac)2
molecule
stabilizes
properties
LiOx
species
mitigates
side
reaction.
situ
UV-vis
XANES
spectra
reveal
direct
interactions
between
O2-/LiO2,
highlighting
superior
reversibility
enhanced
batteries.
Both
experimental
theoretical
results
indicate
that
this
battery
system
exhibits
rapid
reaction
kinetics,
reduced
overpotential
520
mV
extended
cyclability,
surpassing
400
cycles
lower
polarization.
Advanced Energy Materials,
Год журнала:
2023,
Номер
13(28)
Опубликована: Июнь 11, 2023
Abstract
The
all‐solid‐state
lithium–sulfur
battery
is
considered
to
be
a
promising
energy
device
due
high
density
and
excellent
safety.
However,
sulfur
suffers
from
its
insulating
nature
large
volume
changes.
Employing
transition‐metal
sulfide
cathodes
an
attractive
alternative.
Herein,
sulfur‐rich
MoS
6
‐based
nanocomposite
designed,
where
nanospheres
are
homogenously
anchored
on
carbon
nanotubes
(CNTs)
by
wet‐chemical
method,
providing
improved
electronic
conductivity
reduced
In
addition,
nanosized
Li
7
P
3
S
11
electrolyte
in
situ
coated
the
surface
of
‐CNT20
realize
intimate
interface
contact
form
nanoscale
electronic/ionic
transportation
networks.
resultant
‐CNT20@15%Li
composite
shows
(1.7
×
10
−1
cm
)
ionic
(6.7
−4
),
which
eight
three
orders
magnitude
compared
those
.
Li/Li
PS
5
Cl/MoS
exhibits
initial
discharge
capacity
1034.32
mAh
g
at
0.1
A
ultrahigh
reversible
1640
Wh
kg
for
active
material
can
realized,
highest
among
all
cathodes.
Moreover,
it
550.00
0.5
after
1000
cycles,
demonstrating
that
highenergy
cathode
next‐generation
lithium
batteries.
Chemical Society Reviews,
Год журнала:
2024,
Номер
53(6), С. 3134 - 3166
Опубликована: Янв. 1, 2024
The
utilization
of
computational
approaches
at
various
scales,
including
first-principles
calculations,
MD
simulations,
multi-physics
modeling,
and
machine
learning
techniques,
has
been
instrumental
in
expediting
the
advancement
SSEs.
Abstract
Hexagonal
MAB
phases
（
h
‐MAB）
have
attracted
attention
due
to
their
potential
exfoliate
into
MBenes,
similar
MXenes,
which
are
predicted
be
promising
for
Li‐ion
battery
applications.
However,
the
high
cost
of
synthesizing
MBenes
poses
challenges
use
in
batteries.
This
study
presents
a
novel
approach
where
simple
ball‐milling
treatment
is
employed
enhance
purity
‐MAB
phase
Ti
2
InB
and
introduce
significant
indium
defects,
resulting
improved
conductivity
creation
abundant
active
sites.
The
synthesized
with
defects
(V
In
‐Ti
)
exhibits
excellent
electrochemical
properties,
particularly
exceptional
long‐cycle
stability
at
current
densities
5
A
g
−1
(5000
cycles,
average
capacity
decay
0.0018%)
10
(15
000
0.093%).
charge
storage
mechanism
V
,
involving
dual
redox
reaction,
proposed,
promote
In‐Li
alloy
reaction
Li
TiB
layer.
Finally,
full
cell
demonstrates
cycling
0.5
after
350
cycles.
work
first
accessible
scalable
application
as
anode,
unlocking
wealth
possibilities
sustainable
applications
phases.
