Lithium
(Li)
metal
has
become
a
research
hotspot
for
anodes
materials
due
to
its
ultra-high
theoretical
capacity
and
the
lowest
redox
potential.
However,
practical
application
of
Li
batteries
is
hampered
by
formation
uncontrollable
dendrites
irreversible
structural
changes
during
long-term
charge/discharge
process.
Developing
stable
anode
with
uniform
deposition
highly
desirable.
Herein,
surface
fluorination
nickel
nanowires
enabling
LiF-rich
nanoscale
solid
electrolyte
interface
was
demonstrated
anodes.
Free-standing
three-dimensional
(3D)
(NiNWs)
current
collector
decorated
lithiophilic
NiF2
nanosheets
(NiNWs@NiF2)
constructed
via
simple
scalable
strategy.
Theoretical
experimental
analysis
confirmed
that
could
reduce
nucleation
barrier,
facilitating
ion
deposition.
The
3D
conductive
NiNWs
network
enabled
fast
electron
transfer
mitigated
volume
cycling.
Additionally,
(SEI)
layer
formed
between
significantly
improved
interfacial
stability.
As
result,
as-assembled
Li-NiNWs@NiF2
symmetrical
cell
provides
superior
electrochemical
performance,
maintaining
stability
2500
h
at
1.0
mA
cm-2
900
5.0
cm-2.
Furthermore,
assembled
Li-NiNWs@NiF2||
LiFePO4
(LFP)
full
exceptional
retention
93.9%
after
2000
cycles
rate
5
C.
Overall,
unique
structure
NiNWs@NiF2
not
only
offers
straightforward
method
designing
host,
but
also
introduces
concept
engineering
through
creation
an
artificial
SEI
layer.
ACS Applied Materials & Interfaces,
Journal Year:
2024,
Volume and Issue:
16(28), P. 37052 - 37062
Published: July 5, 2024
Covalent
organic
framework
(COF)
aerogels
with
functional
groups
offer
exceptional
processability
and
functionality
for
various
applications.
These
hierarchical
porous
materials
combine
the
advantages
of
COFs
benefits
aerogels,
overcoming
limitations
conventional
insoluble
nonfusible
COF
powders.
However,
achieving
both
high
crystallinity
shape
retention
remains
a
challenge
functionalized
aerogels.
In
this
work,
we
develop
novel
general
solvent
substitution
method
one-step
synthesis
formyl-functionalized
without
harsh
vacuum
conditions.
exhibit
excellent
processing
capabilities,
superior
mechanical
strength,
enhanced
functionality.
As
proof-of-concept,
they
were
used
in
adsorption
lithium
metal
battery
applications,
significantly
maximizing
structural
COFs,
e.g.:
(i)
structure
is
fully
wetted
by
electrolyte
to
form
continuous
transport
channels;
(ii)
polar
groups,
which
are
easier
be
acquired,
help
desolvation
transfer
Li+;
(iii)
regular
pore
structures
stabilize
deposition
Li+
inhibit
growth
dendrites.
combined
contribute
lighter
improved
energy
density
safety.
Nano Letters,
Journal Year:
2024,
Volume and Issue:
24(44), P. 13972 - 13980
Published: Oct. 23, 2024
Lithium
(Li)
metal
batteries
face
challenges,
such
as
dendrite
growth
and
electrolyte
interface
instability.
Artificial
layers
alleviate
these
issues.
Here,
cellulose
nanocrystal
(CNC)
nanomembranes,
with
excellent
mechanical
properties
high
specific
surface
areas,
combine
polyvinylidene-hexafluoropropylene
(PVDF-HFP)
porous
membranes
to
form
an
artificial
solid
interphase
(SEI)
layer.
The
structure
of
PVDF-HFP
equalizes
the
electric
field
near
metallic
lithium
surfaces.
modulus
CNC
(6.2
GPa)
effectively
inhibits
growth,
ensures
uniform
flow
ions
electrode,
dendrites
during
cycling.
synergy
polarity
β-phase
poly(vinylidene
fluoride)
(PVDF)
provides
over
1000
h
stability
for
Li//Li
batteries.
Moreover,
Li//LiFePO
Interdisciplinary materials,
Journal Year:
2024,
Volume and Issue:
unknown
Published: Oct. 28, 2024
Abstract
Commercial
polyolefin
separators
in
lithium
batteries
encounter
issues
of
uncontrolled
lithium‐dendrite
growth
and
safety
incidents
due
to
their
low
Li
+
transference
numbers
()
melting
points.
To
address
these
challenges,
this
study
proposes
an
innovative
approach
by
upgrading
conventional
through
the
incorporation
metal‐organic
framework
(MOF)‐confined
polyoxometalate
(POM).
The
presence
POM
restricts
anion
diffusion
electrostatic
repulsion
while
facilitating
transport
within
MOF
nanochannels
affinity
for
ions.
Moreover,
confinement
effectively
mitigates
acidification
electrolytes
induced
POM.
As
a
proof‐of‐concept,
polypropylene
decorated
with
phosphotungstic
acid@UIO66
(denoted
as
PW
12
@UIO66‐PP)
exhibit
remarkable
lithium‐ion
conductivity
0.78
mS
cm
−1
high
0.75
at
room
temperature.
modified
also
display
excellent
thermal
stability,
preventing
significant
shrinkage
even
150°C.
Furthermore,
symmetric
cells
employing
@UIO66‐PP
stable
cycling
1000
h,
benefiting
from
rapid
Li‐ion
uniform
deposition.
Additionally,
separator
shows
promising
adaptability
industrial
manufacturing
batteries,
evidenced
assembly
4
Ah
NCM811/graphite
pouch
cell
that
retains
97%
capacity
after
350
cycles
C/3,
thus
highlighting
its
potential
practical
applications.
