Abstract
Lithium
(Li)
metal
batteries
are
deemed
as
promising
next‐generation
power
solutions
but
hindered
by
the
uncontrolled
dendrite
growth
and
infinite
volume
change
of
Li
anodes.
The
extensively
studied
3D
scaffolds
generally
lead
to
undesired
“top‐growth”
due
their
high
electrical
conductivity
lack
ion‐transporting
pathways.
Here,
reducing
increasing
ionic
scaffold,
deposition
spot
bottom
scaffold
can
be
regulated,
thus
resulting
in
a
safe
bottom‐up
plating
mode
dendrite‐free
deposition.
symmetrical
cells
with
these
scaffolds,
despite
limited
pre‐plated
capacity
5
mAh
cm
−2
,
exhibit
ultra‐stable
plating/stripping
for
over
1
year
(11
000
h)
at
current
density
3
mA
areal
.
Moreover,
full
further
demonstrate
cycling
stability
under
challenging
conditions,
including
cathode
loading
21.6
mg
low
negative‐to‐positive
ratio
1.6,
electrolyte‐to‐capacity
4.2
g
Ah
−1
ACS Nano,
Год журнала:
2024,
Номер
18(21), С. 13662 - 13674
Опубликована: Май 16, 2024
Porous
copper
(Cu)
current
collectors
show
promise
in
stabilizing
Li
metal
anodes
(LMAs).
However,
insufficient
lithiophilicity
of
pure
Cu
and
limited
porosity
three-dimensional
(3D)
porous
structures
led
to
an
inefficient
Li–Cu
composite
preparation
poor
electrochemical
performance
anodes.
Herein,
we
propose
a
Cu-CuZn
(DG-CCZ)
host
for
tackle
these
issues.
This
architecture
features
pore
size
distribution
lithiophilic-lithiophobic
characteristics
designed
gradient
from
the
inside
outside
anode
structure.
dual-gradient
exhibits
exceptional
capillary
wettability
molten
provides
high
up
66.05%.
design
promotes
preferential
deposition
interior
structure
during
battery
operation,
effectively
inhibiting
dendrite
formation.
Consequently,
all
cell
systems
achieve
significantly
improved
cycling
stability,
including
half-cells,
Li–Li
symmetric
cells,
Li-LFP
full
cells.
When
paired
synergistically
with
double-coated
LiFePO4
cathode,
pouch
configured
multiple
electrodes
demonstrates
impressive
discharge
capacity
159.3
mAh
g–1
at
1C.
We
believe
this
study
can
inspire
future
3D
enhanced
utilization
efficiency
facilitate
development
high-energy
batteries.
Energy & Environmental Science,
Год журнала:
2024,
Номер
17(19), С. 7119 - 7128
Опубликована: Янв. 1, 2024
A
single-ion
conducting
solid
polymer
electrolyte
with
enhanced
Li
+
migration
by
controlling
anion
immobilization
and
solvation
was
developed,
showcasing
superior
electrochemical
performance
industrial
compatibility.
Advanced Materials,
Год журнала:
2024,
Номер
36(19)
Опубликована: Фев. 7, 2024
Abstract
Unleashing
the
potential
of
lithium‐metal
anodes
in
practical
applications
is
hindered
by
inherent
stress‐related
challenges
arising
from
their
limitless
volume
expansion,
leading
to
mechanical
failures
such
as
electrode
cracking,
solid
electrolyte
interphase
damage,
and
dendritic
growth.
Despite
various
protective
strategies
“combat”
stress
anodes,
they
fail
address
intrinsic
issue
fundamentally.
Here,
a
unique
strategy
proposed
that
leverages
generated
during
battery
cycling
via
piezoelectric
effect,
transforming
adaptive
built‐in
electric
field
accelerate
lithium‐ion
migration,
homogenize
lithium
deposition,
alleviate
concentration.
The
mechanism
effect
modulating
electro‐chemomechanical
evolution
further
validated
decoupled
through
finite
element
method
simulations.
Inspired
this
strategy,
high
sensitivity,
fast
responsive,
strength
adaptability
polymer
used
demonstrate
feasibility
corresponding
protected
anode
shows
stability
over
6000
h
under
current
density
10
mA
cm
−2
extending
life
variety
coin
pouch
cell
systems.
This
work
effectively
tackles
issues
decoupling
also
contributes
developing
more
stable
for
future
research.
Advanced Materials,
Год журнала:
2024,
Номер
36(27)
Опубликована: Апрель 4, 2024
Abstract
The
development
of
solid‐state
electrolytes
(SSEs)
with
outstanding
comprehensive
performance
is
currently
a
critical
challenge
for
achieving
high
energy
density
and
safer
batteries
(SSBs).
In
this
study,
strategy
nano‐confined
in
situ
solidification
proposed
to
create
novel
category
molten
guest‐mediated
metal–organic
frameworks,
named
MGM–MOFs.
By
embedding
the
newly
developed
crystalline
organic
electrolyte
(ML
20
)
into
nanocages
anionic
MOF–OH,
MGM–MOF–OH,
characterized
by
multi‐modal
supramolecular
interaction
sites
continuous
negative
electrostatic
environments
within
nano‐channels,
achieved.
These
nanochannels
promote
ion
transport
through
successive
hopping
Li
+
between
neighbored
suppress
anion
movement
chemical
constraint
hydroxyl‐functionalized
pore
wall.
This
results
remarkable
conductivity
7.1
×
10
−4
S
cm
−1
transference
number
0.81.
Leveraging
these
advantages,
SSBs
assembled
MGM–MOF–OH
exhibit
impressive
cycle
stability
specific
410.5
Wh
kg
anode
cathode
under
constrained
conditions
various
working
temperatures.
Unlike
flammable
traditional
MOFs,
demonstrates
robustness
harsh
conditions,
including
ignition,
voltage,
extended
humidity.
Discontinuous
and
uneven
Li+
flux
leads
to
inhomogeneous
reactions,
accelerating
lithium
(Li)
dendrite
growth
reducing
the
utilization
of
active
materials,
which
severely
impacts
performance
metal
batteries
(LMBs).
To
address
this
challenge,
we
propose
an
effective
homogeneous
reaction
design
facilitated
by
all-aligned
nanofibrous
architecture,
establishes
continuous,
uniform,
rapid
pathways
throughout
battery.
This
enhances
diffusion
dynamics
ensures
a
uniform
distribution
current
density,
hence
promoting
Li
nucleation
at
anode
efficient
insertion/extraction
cathode.
Moreover,
architecture
exhibits
superior
mechanical
strength
flexibility,
maintaining
structural
stability
during
long-term
cycling
suppressing
growth,
thereby
minimizing
risk
short
circuits.
As
result,
LMBs
incorporating
exhibit
exceptional
electrochemical
performance.
work
provides
valuable
insights
into
reactions
for
high-performance
LMBs.
ACS Applied Materials & Interfaces,
Год журнала:
2023,
Номер
15(47), С. 54915 - 54922
Опубликована: Ноя. 16, 2023
Sodium
metal
batteries
have
garnered
significant
attention
due
to
their
high
theoretical
specific
capacity,
cost
effectiveness,
and
abundant
availability.
However,
the
propensity
for
dendritic
sodium
formation,
stemming
from
highly
reactive
nature
of
surface,
poses
safety
concerns,
uncontrollable
formation
solid–electrolyte
interphase
(SEI)
leads
large
cell
impedance
battery
failures.
In
this
study,
we
present
a
novel
approach
where
successfully
developed
stable
fluorinated
artificial
SEI
layer
on
surface
by
employing
various
weight
percentages
tin
fluoride
in
dimethyl
carbonate
solution,
utilizing
convenient,
cost-effective,
single-step
method.
The
resulting
fluoride-rich
protective
effectively
stabilized
Na
surfaces
significantly
enhanced
cycling
stability.
engineered
demonstrated
an
lifetime
symmetric
cells
over
3.5
times,
700
h
at
current
density
0.25
mA/cm2,
performance
compared
untreated
sodium,
which
is
attributed
suppression
dendrite
reduction
undesired
during
high-current
cycling.
