Industrial & Engineering Chemistry Research,
Год журнала:
2024,
Номер
unknown
Опубликована: Дек. 12, 2024
The
morphology
and
microstructure
of
precursors
are
the
key
to
preparation
high-quality
NCM
cathodes
due
their
inheritance
relationship.
However,
a
large
amount
sulfate
exists
in
precursors,
detriment
electrochemical
performance
Ni-rich
cathode
materials.
Herein,
an
effective
method
for
reduction
was
proposed
synthesis
Ni0.90Co0.05Mn0.05(OH)2
precursor
by
adding
0.24
M
ammonia
microreactor.
less
Ni(OH)2
with
system
is
attributed
higher
formation
energy
adsorption
(ENi(OH)2-am-SO42–
=
7.483
eV
vs
ENi(OH)2-SO42–
3.451
eV).
results
demonstrated
that
can
promote
growth
primary
particles
(81.5
nm)
reduce
content
impurity
from
0.80
0.28%
precursors.
Moreover,
prepared
materials
exhibit
high
specific
capacity
190.4
mAh
g–1
at
1C
superior
Li+
diffusion
coefficients.
This
study
sheds
light
on
role
rapid
coprecipitation
provides
guidance
process
cathodes.
This
study
examines
tungsten
(W)
doping
in
NCM811
cathodes
via
bulk
(co-precipitation)
and
surface
(solid-state)
methods.
W
enhances
charge
transfer
stabilizes
structure,
reducing
capacity
fade
(retain
92%
after
500
cycles).
Although
layered
oxides
of
LiNixCoyMnzO2
(NCM,
x
+
y
z
=
1)
are
promising
high
energy
density
cathode
materials,
they
still
face
significant
challenges
such
as
the
cracks
caused
by
anisotropic
strain
and
poor
structural
thermal
stability
upon
building
high-performance
rechargeable
lithium-ion
batteries
(LIBs)
for
scale-up
industrialization.
Under
this
circumstance,
La
Mg
elements
theoretically
experimentally
introduced
into
NCM
to
modify
primary
particles
synergistically
lattice
orientation
regulation
surface
perovskite-phase
coating.
The
synthesized
La/Mg
co-doped
delivers
a
discharge-specific
capacity
203
mAh
g-1
at
0.1
C
126.2
10
(1C
200
mA
g-1),
which
results
from
radial
grain
incorporating
trace
amount
dopants,
well
enhancements
on
both
ionic
electronic
conductivities.
Further
analysis
discloses
formation
La-based
perovskite
protective
layer
surface,
plays
key
role
in
stabilizing
oxygen
ions
cycling
increasing
stabilities
cathode.
This
one-step
co-doping
strategy
provides
rewarding
avenue
toward
developing
practical
cathodes
high-performance,
durable
Li
batteries.
ACS Applied Materials & Interfaces,
Год журнала:
2025,
Номер
unknown
Опубликована: Апрель 4, 2025
The
practical
application
of
nickel-rich
layered
transition
metal
oxide
is
hampered
by
its
fast
capacity
decay,
deriving
from
the
side
reactions
with
electrolyte,
crack
formation
caused
volume
variation,
and
phase
change
near
surface
during
charging/discharging
processes.
Here,
we
experimentally
realize
mechano-chemo-electrochemical
coupling
effect
nanolayer
on
to
greatly
improve
electrochemical
performance.
According
detailed
atomic
structure
analysis,
this
facilitates
consuming
residual
lithium
left
oxide,
suppressing
reducing
due
variation
long-term
cycles.
This
design
plays
an
in
mechanical,
chemical,
aspects
simultaneously
which
beneficial
for
their
development.
