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. 40488 - 40495
Published: Aug. 18, 2023
Dry
processing
is
a
promising
method
for
high-performance
and
low-cost
lithium-ion
battery
manufacturing
which
uses
polytetrafluoroethylene
(PTFE)
as
binder.
However,
the
electrochemical
stability
of
PTFE
binder
in
cathodes
generated
chemistry
cathode
electrolyte
interphase
(CEI)
layers
are
rarely
reported.
Herein,
CEI
properties
studied
via
cycling
high-loading
dry-processed
electrodes
electrolytes
with
LiPF6
or
LiClO4
salt.
Using
salt
can
eliminate
other
possible
F
sources,
allowing
decomposition
to
be
studied.
The
detection
LiF
cells
confirms
that
undergoes
side
reaction(s)
cathodes.
When
compared
LiClO4,
layer
much
thicker
when
used
These
results
provide
insights
into
may
potentially
enlighten
development
binders
high
efficiency
long
durability
DP-based
LIBs.
ACS Nano,
Journal Year:
2023,
Volume and Issue:
17(20), P. 20434 - 20444
Published: Oct. 13, 2023
The
solid
electrolyte
interphase
(SEI)
is
a
key
component
of
lithium-ion
battery
forming
during
the
first
few
dischage/charge
cycles
at
interface
between
anode
and
electrolyte.
SEI
passivates
anode–electrolyte
by
inhibiting
further
decomposition,
extending
battery's
cycle
life.
Insights
into
growth
evolution
in
terms
structure
composition
remain
difficult
to
access.
To
unravel
formation
layer
cycles,
operando
electrochemical
liquid
cell
scanning
transmission
electron
microscopy
(ec-LC-STEM)
employed
monitor
real
time
nanoscale
processes
that
occur
their
native
environment.
results
show
not
one-step
process
but
comprises
multiple
steps.
initiated
low
potential
charge
decomposition
leading
nucleation
inorganic
nanoparticles.
Thereafter,
continues
subsequent
an
island-like
layer.
Eventually,
dense
formed
with
mosaic
composed
larger
patches
embedded
matrix
organic
compounds.
While
model
for
generally
accepted,
our
observations
document
detail
how
complex
built
up
discharge/charge
cycling.
Angewandte Chemie International Edition,
Journal Year:
2024,
Volume and Issue:
63(41)
Published: July 16, 2024
Formation
of
LiF-rich
cathode-electrolyte
interphase
is
highly
desirable
for
wide-temperature
battery,
but
its
application
hindered
by
the
unwanted
side
reactions
associated
with
conventional
method
introducing
fluorinated
additives.
Here,
we
developed
an
additive-free
strategy
to
produce
cathode
electrolyte
(CEI)
low-temperature
formation
cycling.
Using
LiNi
Chemistry of Materials,
Journal Year:
2024,
Volume and Issue:
36(19), P. 9299 - 9319
Published: Sept. 18, 2024
With
the
promotion
of
portable
energy
storage
devices
and
popularization
electric
vehicles,
lithium-ion
battery
(LiB)
technology
plays
a
crucial
role
in
modern
systems.
Over
past
decade,
demands
for
LiBs
have
centered
around
high
density
long
cycle
life.
These
parameters
are
often
determined
by
characteristics
active
materials
electrodes.
Given
its
abundance,
environmental
friendliness,
low
cost
capacity,
magnetite
(Fe
ACS Applied Materials & Interfaces,
Journal Year:
2023,
Volume and Issue:
15(36), P. 42449 - 42459
Published: Sept. 2, 2023
Interfacial
instabilities
in
electrodes
control
the
performance
and
lifetime
of
Li-ion
batteries.
While
formation
solid-electrolyte
interphase
(SEI)
on
anodes
has
received
much
attention,
there
is
still
a
lack
understanding
cathode-electrolyte
(CEI)
cathodes.
To
fill
this
gap,
we
report
dynamic
deformations
LiFePO4
cathodes
during
charge/discharge
by
utilizing
operando
digital
image
correlation,
impedance
spectroscopy,
cryo
X-ray
photoelectron
spectroscopy.
were
cycled
either
LiPF6,
LiClO4,
or
LiTFSI-containing
organic
liquid
electrolytes.
Beyond
first
cycle,
intercalation
results
nearly
linear
correlation
between
electrochemical
strains
state
(dis)-charge,
regardless
electrolyte
chemistry.
However,
charge
LiPF6-containing
electrolyte,
distinct
irreversible
positive
strain
evolution
at
onset
anodic
current
rise
as
well
decay
around
4.0
V.
Impedance
studies
show
an
increase
surface
resistance
same
potential
window,
suggesting
CEI
layers
cathode.
The
chemistry
layer
was
characterized
LiF
detected
starting
early
3.4
V
LixPOyFz
appeared
voltages
higher
than
charge.
Our
approach
offers
insights
into
mechanism
cathode
electrodes,
which
crucial
for
development
robust
chemistries
higher-performance
