Abstract
Micron‐sized
Si
anodes
garner
renewed
attention
due
to
their
advantages
of
low
cost,
small
specific
surface
area,
and
high
energy
density.
However,
micron‐sized
undergo
significant
volume
changes
during
lithiation/delithiation,
leading
particle
cracking
pulverization.
This
study
employs
the
tape
casting
method
ultrafast
high‐temperature
sintering
technology
construct
a
porous
sheet,
within
which
solid
framework
constrains
particles.
In
rate
performance
tests,
when
current
density
rises
1
A
g
−1
,
in
sheet
demonstrates
delithiation
capacity
2145
mAh
compared
113
for
pristine
Si,
showing
efficient
ion
electron
conductive
pathways
framework.
When
cycled
at
0.3
ball‐milled
is
1496
after
100
cycles,
contrast
95
Si.
The
enhanced
cycling
stability
results
from
strong
mechanical
constraint
imposed
by
framework,
suppresses
changes,
inhibits
cracking,
reduces
electrolyte
interphase
growth.
strategy
constructing
sheets
utilizing
solid‐solid
bonding
constrain
particles
represents
novel
approach
anode
modification.
Energy & Environmental Science,
Год журнала:
2025,
Номер
unknown
Опубликована: Янв. 1, 2025
Zn(CF
3
COO)
2
promotes
the
dual
reduction
of
anions
to
fluoride
and
sulfide,
forming
an
amorphous
hybrid
solid
electrolyte
interface
(SEI).
This
SEI
significantly
benefits
plating/stripping
Zn
anode
thereby
improves
battery
performance.
Nanomaterials,
Год журнала:
2025,
Номер
15(7), С. 512 - 512
Опубликована: Март 28, 2025
All-solid-state
batteries
have
garnered
significant
attention
due
to
their
potential
exceed
the
energy
density
of
conventional
lithium-ion
batteries,
particularly
when
alloying-based
materials
or
lithium
metal
anodes
are
used.
However,
achieving
compatibility
with
remains
a
persistent
bottleneck.
In
this
study,
we
shed
light
on
SnHPO3
tin
phosphite
and
Ni3.4Sn4
intermetallic
as
novel
conversion/alloying
anode
for
all-solid-state
using
Li6PS5Cl
solid
electrolyte.
The
two
Sn-based
active
were
nanostructured
by
ball-milling
demonstrate
considerable
promise
application
in
half-cells.
Galvanostatic
cycling
at
room
temperature
revealed
electrochemical
behavior
based
reactions
akin
those
observed
batteries.
Promisingly,
both
exhibited
satisfying
stability,
coulombic
efficiencies
exceeding
97%.
These
findings
indicate
that
electrolyte
is
compatible
alloying
anodes.
The
SiOx
anode
exhibits
a
high
specific
capacity
and
commendable
durability
for
lithium-ion
batteries
(LIBs).
However,
its
practical
application
is
hindered
by
significant
volumetric
fluctuations
during
lithiation/delithiation,
alongside
metastable
nature,
which
induces
mechanical
instability
irreversible
lithium
consumption,
ultimately
impairing
long-term
retention
in
full-battery
cell
configurations.
In
this
study,
we
present
phase-engineering
approach
designed
to
improve
the
structural
stability
of
anodes
LIB
applications.
By
incorporating
fluoride,
amorphous
undergoes
partial
transformation
into
quartz-like
phase,
enhances
integrity
mitigates
loss.
This
modified
demonstrates
significantly
improved
prolonged
cycle
lifespan.
Through
combination
multiscale
simulations
situ
characterizations,
elucidate
stabilization
mechanisms
conferred
quartz
providing
critical
insights
role
SiOx's
crystal
structure
influencing
degradation
pathways.
work
introduces
an
accessible
efficient
method
controlling
crystallinity
SiOx,
offering
solution
enhance
high-energy-density
LIBs.
Although
a
high
stack
pressure
(≥50
MPa)
enhances
solid-solid
contacts
in
solid-state
batteries
(SSBs),
it
poses
impracticality
for
commercialization.
This
work
proposes
self-pressure
silicon
(Si)-carbon
composite
anode
that
enables
stable
operation
under
reduced
external
(≤2
MPa).
The
features
prestress
structure
can
effectively
alleviate
the
internal
and
stress
simultaneously,
which
is
fabricated
with
ionic-conductive
poly(ethylene
oxide)
(PEO)/lithium
salt-coated
carbon
nanotubes
(CNTs)
being
compressed
by
shrinking
graphene
hydrogel.
capillary-driven
hydrogel
shrinkage
generates
pressure,
compensating
volumetric
expansion
(up
to
300%)
of
Si.
creates
dynamic
interfaces
between
CNTs/PEO
expanding
Si,
ensuring
both
mechanical
stability
ion/electron
transport.
SSBs
this
have
long
cycle
life
700
cycles
capacity
retention
79.2%
an
organic/inorganic
electrolyte
without
(0
half-cell
using
sulfide
reached
was
able
achieve
at
lowest
2
MPa
pressure.
design
resolves
interfacial
challenges
SSBs.
Batteries & Supercaps,
Год журнала:
2024,
Номер
unknown
Опубликована: Окт. 10, 2024
Abstract
The
electrolyte
additives
fluoroethylene
carbonate
(FEC)
and
vinylene
(VC)
improve
the
lifetime
of
lithium‐ion
batteries
with
silicon‐containing
anodes
by
their
reduction
yielding
a
more
stable
solid
interphase
(SEI).
However,
reductive
decomposition
mechanism
FEC
VC
has
not
yet
been
fully
clarified.
For
this
purpose,
we
investigate
in
LiNi
0.6
Co
0.2
Mn
O
2
(NCM622)/silicon‐graphite
pouch
cells
containing
either
1
M
LiPF
6
FEC:dimethyl
(DMC)
or
VC:DMC
using
high‐performance
liquid
chromatography,
gas
X‐ray
photoelectron
spectroscopy,
inductively
coupled
plasma
optical
emission
spectrometry.
Based
on
molar
consumptions
VC,
cumulative
irreversible
capacities,
show
that
three
electrons
are
consumed
for
every
reduced
molecule,
one
electron
is
molecule.
results,
reactions
proposed
LiF,
Li
CO
3
,
C
4
HCO
Li,
PEO‐type
polymer.
Furthermore,
reaction
lithium‐containing,
polymerized
VC.
During
formation,
capacity
loss
induced
lithium
trapping
x
Si
y
/Li
SiO
under
SEI
SEI.
subsequent
cycling,
only
triggers
loss.
