ACS Nano,
Journal Year:
2024,
Volume and Issue:
18(15), P. 10566 - 10581
Published: April 1, 2024
Ni-rich
layered
oxides
have
received
significant
attention
as
promising
cathode
materials
for
Li-ion
batteries
due
to
their
high
reversible
capacity.
However,
intergranular
and
intragranular
cracks
form
at
state-of-charge
(SOC)
levels
exceeding
4.2
V
(vs.
Li/Li+),
representing
a
prominent
failure
mechanism
of
oxides.
The
nanoscale
crack
formation
SOC
is
attributed
volume
change
resulting
from
phase
transition
between
the
H2
H3
phases.
Herein,
in
contrast
electrochemical
levels,
another
chemical
pit
on
directly
evidenced
fully
lithiated
(low
levels).
This
associated
with
stress
corrosion
cracking,
driven
by
elevated
temperatures.
nanoscopic
behavior
during
aging
temperatures
investigated
using
high-resolution
transmission
electron
microscopy,
revealing
that
microcracks
can
develop
through
two
distinct
mechanisms:
cycling
corrosion.
Notably,
occur
even
discharged
state
levels),
whereas
are
observed
only
levels.
finding
provides
comprehensive
understanding
complex
mechanisms
an
opportunity
improve
performance.
ACS Applied Materials & Interfaces,
Journal Year:
2023,
Volume and Issue:
15(34), P. 40385 - 40396
Published: Aug. 18, 2023
Lithium
manganese
oxide
(LiMn2O4)
is
a
prevalent
cathode
material
for
lithium-ion
batteries
due
to
its
low
cost,
abundant
sources,
and
ecofriendliness.
However,
capacity
fade,
energy
density,
fast
auto-discharge
hinders
large-scale
commercialization.
Consequently,
scientists
are
urged
achieve
high-performance
LMO
cathodes
through
doping
surface
modification
using
wide
range
of
transition
metals,
polymers,
carbon
precursors.
Few
studies
have
considered
the
potential
high-valence
metal
oxides
in
stabilizing
LMO's
cycling
process
enhancing
overall
battery
performance.
In
this
work,
we
report
synthesis
surface-modified
lithium
tungsten
(WVIO3).
Different
WO3
wt
%
were
investigated
before
settling
0.5%WO3-LMO
as
synergic
LMO.
Using
galvanostatic
charge–discharge,
0.50
WO3-LMO
exhibited
better
rate
capability
by
retaining
51%
initial
at
20C
rate,
compared
34%
pristine
Furthermore,
cyclic
voltammetry
different
scan
rates
showed
that
possesses
ion
diffusion
than
LMO,
around
10–11
10–13
cm2·s–1
respectively.
Finally,
situ
Raman
spectroscopy,
reaction
mechanisms
during
investigated,
operando
accelerating
calorimetry
(ARC)
visualized
thermal
stability
highlighted
use
safe
high-voltage
automotive
applications.
ACS Nano,
Journal Year:
2024,
Volume and Issue:
18(15), P. 10566 - 10581
Published: April 1, 2024
Ni-rich
layered
oxides
have
received
significant
attention
as
promising
cathode
materials
for
Li-ion
batteries
due
to
their
high
reversible
capacity.
However,
intergranular
and
intragranular
cracks
form
at
state-of-charge
(SOC)
levels
exceeding
4.2
V
(vs.
Li/Li+),
representing
a
prominent
failure
mechanism
of
oxides.
The
nanoscale
crack
formation
SOC
is
attributed
volume
change
resulting
from
phase
transition
between
the
H2
H3
phases.
Herein,
in
contrast
electrochemical
levels,
another
chemical
pit
on
directly
evidenced
fully
lithiated
(low
levels).
This
associated
with
stress
corrosion
cracking,
driven
by
elevated
temperatures.
nanoscopic
behavior
during
aging
temperatures
investigated
using
high-resolution
transmission
electron
microscopy,
revealing
that
microcracks
can
develop
through
two
distinct
mechanisms:
cycling
corrosion.
Notably,
occur
even
discharged
state
levels),
whereas
are
observed
only
levels.
finding
provides
comprehensive
understanding
complex
mechanisms
an
opportunity
improve
performance.
