Advanced Functional Materials,
Год журнала:
2025,
Номер
unknown
Опубликована: Март 18, 2025
Abstract
To
extend
the
lifespan
of
Ni‐rich
layered
oxide
cathodes,
doping,
coating,
and
particle‐morphology
optimization
strategies
have
been
explored,
though
these
approaches
often
result
in
reduced
reversible
capacity.
In
this
study,
a
novel
LiNi
0.92
Co
0.04
Mn
O
2
cathode
is
introduced
featuring
gradients
Li
concentration
particle
size
at
secondary‐particle
level.
By
controlling
oxygen
partial
pressure
during
synthesis,
enhanced
cycle
stability
achieved
without
compromising
capacity
unique
structure.
Contrary
to
common
knowledge,
superior
performance
materials
synthesized
under
oxygen‐deficient
conditions
reported,
delivering
remarkable
226.7
mAh
g
−1
robust
retention
87.23%
after
200
cycles.
These
electrodes
achieve
85.08%
C/0.1
C,
demonstrating
excellent
rate
performance.
Comprehensive
diffraction
microscopy
analyses
identify
secondary
particles
with
Li‐excess
structures
on
their
surfaces
(characterized
by
larger
primary
particles)
stoichiometric
core
(featuring
smaller
particles).
This
dual‐gradient
structure
enhances
suppressing
surface
reactions
stabilizing
bulk.
Furthermore,
retain
pristine
microstructure
electrochemical
cycling,
minimize
lattice
contraction
(3.86%),
suppress
H2‐to‐H3
transitions.
study
highlights
potential
using
mitigate
side
reactions,
paving
way
for
development
durable,
high‐capacity,
cost‐effective
cathodes.
ACS Nano,
Год журнала:
2024,
Номер
18(20), С. 13150 - 13163
Опубликована: Май 10, 2024
Layered
sodium
transition-metal
(TM)
oxides
generally
suffer
from
severe
capacity
decay
and
poor
rate
performance
during
cycling,
especially
at
a
high
state
of
charge
(SoC).
Herein,
an
insight
into
failure
mechanisms
within
high-voltage
layered
cathodes
is
unveiled,
while
two-in-one
tactic
localization
coherent
structures
devised
to
improve
structural
integrity
Na+
transport
kinetics,
elucidated
by
density
functional
theory
calculations.
Elevated
Jahn–Teller
[Mn3+O6]
concentration
on
the
particle
surface
sodiation,
coupled
with
intense
interlayer
repulsion
adverse
oxygen
instability,
leads
irreversible
damage
near-surface
structure,
as
demonstrated
X-ray
absorption
spectroscopy
in
situ
characterization
techniques.
It
further
validated
that
skeleton
substantially
strengthened
through
electronic
structure
modulation
surrounding
oxygen.
Furthermore,
optimized
diffusion
effectively
attainable
via
regulating
intergrown
structures,
successfully
achieved
Zn2+
inducer.
Greatly,
good
redox
reversibility
initial
Coulombic
efficiency
92.6%,
impressive
capability
(86.5
mAh
g–1
70.4%
retention
10C),
enhanced
cycling
stability
(71.6%
after
300
cycles
5C)
are
exhibited
P2/O3
biphasic
cathode.
believed
profound
comprehension
will
herald
fresh
perspectives
develop
cathode
materials
for
sodium-ion
batteries.
eScience,
Год журнала:
2024,
Номер
unknown, С. 100276 - 100276
Опубликована: Май 1, 2024
Microstructure
engineering
serves
as
a
potent
approach
to
counteract
the
mechanical
deterioration
of
Ni-rich
layered
cathodes,
stemming
from
anisotropic
strain
during
Li+
(de)intercalation.
However,
pressing
challenge
persists
in
devising
direct
method
for
fabricating
radially
aligned
cathodes
utilizing
oriented
hydroxide
precursors.
In
this
study,
we
synthesized
LiNi0.92Co0.04Mn0.04O2
oxides
boasting
superior
aligned,
size-refined
primary
particles
through
combination
strategic
precipitation
regulation
and
lithiation
tuning.
Elongated
particles,
achieved
by
stepwise
control
ammonia
concentration
pH
particle
growth,
facilitate
formation
precursor
particles.
Leveraging
our
prepared
cathode
exhibits
high
discharge
capacity
229
mAh
g−1
at
0.05
C,
alongside
excellent
cycle
stability,
retaining
93.3%
after
200
cycles
0.5
C
(30
°C)
half
cell,
86.4%
1000
1
full
cell.
Revisiting
oxide
underscores
significance
controlling
maximize
size
perpendicular
[001]
attain
suitable
along
high-temperature
calcination,
offering
valuable
insights
synthesizing
high-performance
cathodes.
Chemical Society Reviews,
Год журнала:
2024,
Номер
53(23), С. 11462 - 11518
Опубликована: Янв. 1, 2024
The
nano-rod
structure
is
a
promising
approach
for
developing
high
performance
cathode
materials.
This
review
discusses
cathodes'
origin,
physicochemical,
and
electrochemical
properties
their
application
in
next-generation
batteries.
