Advanced Materials,
Год журнала:
2024,
Номер
36(32)
Опубликована: Июнь 11, 2024
Abstract
The
cycling
stability
of
LiNi
0.8
Co
0.1
Mn
O
2
under
high
voltages
is
hindered
by
the
occurrence
hybrid
anion‐
and
cation‐redox
processes,
leading
to
oxygen
escape
uncontrolled
phase
collapse.
In
this
study,
an
interfacial
engineering
strategy
involving
a
straightforward
mechanical
ball
milling
low‐temperature
calcination,
employing
Se‐doped
FeSe
&Fe
3
‐modified
approach
proposed
design
stable
Ni‐rich
cathode.
Se
2−
are
selectively
adsorbed
within
vacancies
form
─
TM
bond,
effectively
stabilizing
lattice
oxygen,
preventing
structural
distortion.
Simultaneously,
Se‐NCM811//FeSe
//Fe
self‐assembled
electric
field
activated,
improving
charge
transfer
coupling.
Furthermore,
accelerates
Li
+
diffusion
reacts
with
Fe
SeO
.
coating
mitigates
hydrofluoric
acid
erosion
acts
as
electrostatic
shield
layer,
limiting
outward
migration
anions.
Impressively,
modified
materials
exhibit
significantly
improved
electrochemical
performance,
capacity
retention
79.7%
after
500
cycles
at
1C
4.5
V.
it
provides
extraordinary
94.6%
in
3–4.25
V
550
pouch‐type
full
battery.
This
dual‐modification
demonstrates
its
feasibility
opens
new
perspective
for
development
lithium‐ion
batteries
operating
voltages.
The
development
of
advanced
layered
Ni-rich
cathodes
is
essential
for
high-energy
lithium-ion
batteries
(LIBs).
However,
the
prevalent
are
still
plagued
by
inherent
issues
chemomechanical
and
thermal
instabilities
limited
cycle
life.
For
this,
here,
we
introduce
an
efficient
approach
combining
single-crystalline
(SC)
design
with
in
situ
high-entropy
(HE)
doping
to
engineer
ultrahigh-Ni
cobalt-free
cathode
LiNi
Advanced Functional Materials,
Год журнала:
2023,
Номер
33(27)
Опубликована: Апрель 17, 2023
Abstract
Transition
metal
doped
LiNiO
2
layered
compounds
have
attracted
significant
interest
as
cathode
materials
for
lithium‐ion
batteries
(LIBs)
in
recent
years
due
to
their
high
energy
density.
However,
a
critical
issue
of
‐based
cathodes
is
caused
particularly
at
highly
delithiated
state
by
irreversible
phase
transition,
initiation/propagation
cracks,
and
extensive
reactions
with
electrolyte.
Herein,
tungsten
boride
(WB)‐doped
single‐crystalline
LiNi
0.83
Co
0.07
Mn
0.1
O
(SNCM)
reported
that
affectively
addresses
these
drawbacks.
In
situ/ex
situ
microscopic
spectroscopic
evidence
B
3+
enters
the
bulk
SNCM,
enlarging
interlayer
spacing,
thus
facilitating
Li
+
diffusion,
while
W
forms
an
amorphous
surface
layer
consisting
x
y
z
(LWO)
(LBO),
which
aids
construction
robust
cathode‐electrolyte
interphase
(CEI)
film,
are
shown.
It
also
shown
WB
doping
effective
controlling
degree
c‐axis
contraction
release
oxygen‐containing
gases
voltages.
The
best
concentration
0.6
wt.%,
capacity
retention
rate
SNCM
reaches
93.2%
after
200
cycles
2.7–4.3
V,
morphology
structure
material
remain
largely
unchanged.
presented
modification
strategy
offers
new
way
design
stable
high‐energy‐density
LIBs.
Advanced Energy Materials,
Год журнала:
2024,
Номер
14(12)
Опубликована: Фев. 22, 2024
Abstract
Nickel‐rich
layered
oxides
are
a
class
of
promising
cathodes
for
high‐energy‐density
lithium‐ion
batteries
(LIBs).
However,
their
structural
instability
derived
from
crystallographic
planar
gliding
and
microcracking
under
high
voltages
has
significantly
hindered
practical
applications.
Herein,
resurfacing
engineering
single‐crystalline
LiNi
0.83
Co
0.07
Mn
0.1
O
2
(SNCM)
cathode
is
undertaken.
A
passivation
shell,
comprising
surface
fast
ion
conductor
Li
1.25
Al
0.25
Ti
1.5
4
(LATO)
layer
near‐surface
confined
cation
hybridization
region,
established
through
co‐infiltrating
into
SNCM,
which
can
profoundly
improve
stability.
Compelling
evidences
show
that
high‐conductivity
LATO‐overcoat
facilitates
+
conduction
resists
electrolyte
attack.
The
introduction
strong
Al─O
bonds
regions
stabilize
bulk
lattice
oxygen
respectively
during
cycling,
thus
hindering
the
formation
vacancies
occurrence
detrimental
phase
transformations,
ultimately
suppressing
nanocracking.
Subsequently,
modified
SNCM
drastically
outperforms
baseline
exhibiting
an
ultrahigh
88.9%
retention
rate
original
capacity
at
1.0C
after
400
cycles,
discharge
146.8
mAh
g
−1
with
92.6%
200
cycles
5.0C
within
voltage
window
2.7–4.3
V.
performance
demonstrated
by
multifunctional
coating
highlights
new
way
to
Ni‐rich
LIBs.
Advanced Energy Materials,
Год журнала:
2024,
Номер
unknown
Опубликована: Июнь 29, 2024
Abstract
Cathode
materials
are
the
core
components
of
lithium‐ion
batteries
owing
to
determination
practical
voltage
and
effective
energy
battery
system.
However,
advanced
cathodes
have
faced
challenges
related
cation
migration
intermixing.
In
this
review,
study
summarizes
structural
failure
mechanisms
due
mixing
cathodes,
including
Ni‐rich
Li‐rich
layered
spinel,
olivine,
disordered
rock‐salt
materials.
This
review
starts
by
discussing
degradation
caused
intermixing
in
different
focusing
on
electronic
structure,
crystal
electrode
structure.
Furthermore,
optimization
strategies
for
inhibition
rational
utilization
systematically
encapsulated.
Last
but
not
least,
remaining
proposed
perspectives
highlighted
future
development
cathodes.
The
accurate
analysis
using
characterization,
precise
control
material
synthesis,
multi‐dimensional
synergistic
modification
will
be
key
research
areas
provides
a
comprehensive
understanding
emerge
as
pivotal
controllable
factors
further
Advanced Functional Materials,
Год журнала:
2024,
Номер
34(23)
Опубликована: Фев. 10, 2024
Abstract
Oxygen
loss
is
a
serious
problem
of
lithium‐rich
layered
oxide
(LLO)
cathodes,
as
the
high
capacity
LLO
relies
on
reversible
oxygen
redox.
release
can
occur
at
surface
leading
to
formation
spinel
or
rock
salt
structures.
Also,
lattice
will
usually
become
unstable
after
long
cycling,
which
remains
major
roadblock
in
application
LLO.
Here,
it
shown
that
Zr
doping
an
effective
strategy
retain
due
affinity
between
and
O.
A
simple
sol‐gel
method
used
dope
4+
into
LLOs
adjust
local
electronic
structure
inhibit
diffusion
anions
during
cycling.
Compared
with
untreated
LLOs,
LLO–Zr
cathodes
exhibit
higher
cycling
stability,
94%
retention
100
cycles
0.4
C,
up
223
mAh
g
−1
1
88%
300
cycles.
Theoretical
calculations
show
strong
Zr–O
covalent
bonding,
energy
vacancies
has
effectively
increased
under
voltage
be
suppressed.
This
study
provides
for
developing
high‐capacity
cyclability
Li‐rich
cathode
materials
lithium‐ion
batteries.
Advanced Materials,
Год журнала:
2024,
Номер
36(16)
Опубликована: Янв. 13, 2024
Abstract
The
limited
cyclability
of
high‐specific‐energy
layered
transition
metal
oxide
(LiTMO
2
)
cathode
materials
poses
a
significant
challenge
to
the
industrialization
batteries
incorporating
these
materials.
This
limitation
can
be
attributed
various
factors,
with
intrinsic
behavior
crystal
structure
during
cycle
process
being
key
contributor.
These
factors
include
phase
induced
cracks,
reduced
Li
active
sites
due
Li/Ni
mixing,
and
slower
+
migration.
In
addition,
presence
synthesis‐induced
heterogeneous
phases
lattice
defects
cannot
disregarded
as
they
also
contribute
degradation
in
performance.
Therefore,
gaining
profound
understanding
intricate
relationship
among
material
synthesis,
structure,
performance
is
imperative
for
development
LiTMO
.
paper
highlights
pivotal
role
structural
play
provides
comprehensive
overview
how
control
influence
specific
pathways
evolution
synthesis
process.
it
summarizes
scientific
challenges
associated
diverse
modification
approaches
currently
employed
address
cyclic
failure
overarching
goal
provide
readers
insights
into
study
ACS Nano,
Год журнала:
2024,
Номер
18(11), С. 8002 - 8016
Опубликована: Март 7, 2024
Single-crystal
Ni-rich
cathodes
offer
promising
prospects
in
mitigating
intergranular
microcracks
and
side
reaction
issues
commonly
encountered
conventional
polycrystalline
cathodes.
However,
the
utilization
of
micrometer-sized
single-crystal
particles
has
raised
concerns
about
sluggish
Li+
diffusion
kinetics
unfavorable
structural
degradation,
particularly
high
Ni
content
Herein,
we
present
an
innovative
situ
doping
strategy
to
regulate
dominant
growth
characteristic
planes
precursor,
leading
enhanced
mechanical
properties
effectively
tackling
challenges
posed
by
ultrahigh-nickel
layered
Compared
with
traditional
dry-doping
method,
our
approach
possesses
a
more
homogeneous
consistent
modifying
effect
from
inside
out,
ensuring
uniform
distribution
ions
large
radius
(Nb,
Zr,
W,
etc).
This
mitigates
generally
unsatisfactory
substitution
effect,
thereby
minimizing
undesirable
coating
layers
induced
different
solubilities
during
calcination
process.
Additionally,
uniformly
dispersed
this
are
beneficial
for
alleviating
two-phase
coexistence
H2/H3
optimizing
concentration
gradient
cycling,
thus
inhibiting
formation
intragranular
cracks
interfacial
deterioration.
Consequently,
doped
demonstrate
exceptional
cycle
retention
rate
performance
under
various
harsh
testing
conditions.
Our
optimized
not
only
expands
application
elemental
but
also
offers
research
direction
developing
high-energy-density
extended
lifetime.
Advanced Functional Materials,
Год журнала:
2023,
Номер
33(23)
Опубликована: Март 15, 2023
Abstract
Ni‐rich
layered
cathode
materials
are
progressively
considered
as
the
standard
configuration
of
high‐energy
electric
vehicles
by
virtues
their
high
capacity
and
eliminated
“range
anxiety.”
However,
poor
cyclic
stability
severe
cobalt
supply
crisis
would
restrain
wide
commercial
applicability.
Here,
a
cost‐effective
single‐crystal
Co‐free
material
LiNi
0.8
Mn
0.18
Fe
0.02
O
2
(NMF),
which
outperforms
widely
polycrystalline
0.83
Co
0.11
0.06
(MNCM)
(SNCM)
is
reported.
Surprisingly,
NMF
can
compensate
for
reversible
loss
under
designed
conditions
high‐temperature
elevated‐voltage,
achieving
competitive
energy
density
compared
with
conventional
MNCM
or
SNCM.
Combining
operando
characterizations
functional
theory
calculation,
it
revealed
that
improved
dynamic
structure
evolution
largely
alleviates
mechanical
strain
issue
commonly
found
in
cathode,
reduce
formation
intragranular
cracks
improve
safety
performance.
Consequently,
this
new
achieve
perfect
equilibrium
between
cost
electrochemical
performance,
not
only
reduces
production
>15%,
but
also
demonstrates
excellent
thermal
cycling
performance..