Chemical Science,
Год журнала:
2024,
Номер
15(12), С. 4238 - 4274
Опубликована: Янв. 1, 2024
In
response
to
societal
developments
and
the
growing
demand
for
high-energy-density
battery
systems,
alkali
metal
batteries
(AMBs)
have
emerged
as
promising
candidates
next-generation
energy
storage.
Despite
their
high
theoretical
specific
capacity
output
voltage,
AMBs
face
critical
challenges
related
reactivity
with
electrolytes
unstable
interphases.
This
review,
from
perspective
of
electrolytes,
analyzes
AMB
failure
mechanisms,
including
interfacial
side
reactions,
active
materials
loss,
dendrite
growth.
It
then
reviews
recent
advances
in
innovative
electrolyte
molecular
designs,
such
ether,
ester,
sulfone,
sulfonamide,
phosphate,
salt,
aimed
at
overcoming
above-mentioned
challenges.
Finally,
we
propose
current
design
principles
future
directions
that
can
help
precise
design.
Journal of the American Chemical Society,
Год журнала:
2023,
Номер
145(15), С. 8700 - 8713
Опубликована: Апрель 7, 2023
Element
doping/substitution
has
been
recognized
as
an
effective
strategy
to
enhance
the
structural
stability
of
layered
cathodes.
However,
abundant
substitution
studies
not
only
lack
a
clear
identification
sites
in
material
lattice,
but
rigid
interpretation
transition
metal
(TM)-O
covalent
theory
is
also
sufficiently
convincing,
resulting
proposals
being
dragged
into
design
blindness.
In
this
work,
taking
Li1.2Ni0.2Mn0.6O2
prototype,
intense
correlation
between
"disordered
degree"
(Li/Ni
mixing)
and
interface-structure
(e.g.,
TM-O
environment,
slab/lattice,
Li+
reversibility)
revealed.
Specifically,
degree
disorder
induced
by
Mg/Ti
extends
opposite
direction,
conducive
sharp
differences
TM-O,
diffusion,
anion
redox
reversibility,
delivering
fairly
distinct
electrochemical
performance.
Based
on
established
paradigm
systematic
characterization/analysis,
"degree
disorder"
shown
be
powerful
indicator
modification
element
substitution/doping.
Chemical Society Reviews,
Год журнала:
2024,
Номер
53(9), С. 4707 - 4740
Опубликована: Янв. 1, 2024
The
microstructural
degradation,
stabilization,
and
characterization
of
layered
Ni-rich
cathodes
for
Li-ion
batteries
are
comprehensively
reviewed
in
this
paper.
Nature Communications,
Год журнала:
2024,
Номер
15(1)
Опубликована: Март 6, 2024
Abstract
Constraining
the
electrochemical
reactivity
of
free
solvent
molecules
is
pivotal
for
developing
high-voltage
lithium
metal
batteries,
especially
ether
solvents
with
high
Li
compatibility
but
low
oxidation
stability
(
<4.0
V
vs
+
/Li).
The
typical
concentration
electrolyte
approach
relies
on
nearly
saturated
coordination
to
molecules,
which
confronted
severe
side
reactions
under
voltages
>4.4
V)
and
extensive
exothermic
between
reactive
anions.
Herein,
we
propose
a
molecular
anchoring
restrict
interfacial
in
diluted
electrolytes.
hydrogen-bonding
interactions
from
effectively
suppress
excessive
enhances
nickel
rich
cathodes
at
4.7
V,
despite
extremely
/ether
molar
ratio
(1:9)
absence
anion-derived
interphase.
Furthermore,
processes
thermal
abuse
conditions
are
mitigated
due
reduced
anions,
postpones
battery
runaway.
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 Energy Materials,
Год журнала:
2024,
Номер
14(11)
Опубликована: Янв. 26, 2024
Abstract
Single‐crystal
Ni‐rich
LiNi
1−x−y
Co
x
Mn
y
O
2
(NCM)
cathodes
have
garnered
widespread
attention
in
the
lithium‐ion
battery
community
due
to
their
unique
advantages
mechanical
performance
and
ability
minimize
interfacial
electrochemical
side
reactions.
The
synthesis
of
single‐crystal
materials
with
monodisperse
appropriate
size,
minimal
lattice
defects,
highly
ordered
structures
is
key
for
high‐performance
batteries.
However,
achieving
this
goal
poses
challenges
lack
in‐depth
understanding
regarding
specific
experimental
parameters
solid
reaction
mechanism
during
process.
In
review,
aim
provide
an
analysis
critical
process
involved
impact
on
crystal
morphology,
structure,
performance.
Consequently,
first
section
focuses
effect
precursor
lithium
salt,
atmosphere,
sintering
procedure.
second
section,
study
delves
into
discussion
growth
mechanism.
Lastly,
it
concluded
by
highlighting
prospects
associated
application
NCM
cathodes.
ACS Applied Materials & Interfaces,
Год журнала:
2024,
Номер
16(9), С. 11377 - 11388
Опубликована: Фев. 22, 2024
Ni-rich
layered
oxides
LiNixCoyMn1–x–yO2
(NCMs,
x
>
0.8)
are
the
most
promising
cathode
candidates
for
Li-ion
batteries
because
of
their
superior
specific
capacity
and
cost
affordability.
Unfortunately,
NCMs
suffer
from
a
series
formidable
challenges
such
as
structural
instability
incompatibility
with
commonly
used
electrolytes,
which
seriously
hamper
practical
applications
on
large
scale.
Herein,
Al/Ta
codoping
modification
strategy
is
proposed
to
improve
performance
LiNi0.83Co0.1Mn0.07O2
cathode,
as-prepared
Al/Ta-modified
delivers
exceptional
cycling
stability
retention
97.4%
after
150
cycles
at
1C
an
excellent
rate
high
143.2
mAh
g–1
even
3C.
Based
experimental
study,
it
found
that
NCM
strengthened
due
regulated
coordination
oxygen
by
introducing
robust
Ta–O
covalent
bond,
prevents
structure
collapsing.
Moreover,
reconstructed
rock-salt-like
surface
capable
effectively
inhibiting
interfacial
side
reactions
well
overgrowth
cathode–electrolyte
interface.
Theoretically,
energy
Li/Ni
mixing
significantly
increased
introduction
Al
Ta
elements
in
codoped
NCM,
leading
inhibited
adverse
phase
transition
during
cycling.
A
feasible
pathway
designing
developing
advanced
materials
provided
this
work.
