Angewandte Chemie International Edition,
Год журнала:
2024,
Номер
unknown
Опубликована: Окт. 10, 2024
Abstract
Free
from
strategically
important
elements
such
as
lithium,
nickel,
cobalt,
and
copper,
potassium‐ion
batteries
(PIBs)
are
heralded
promising
low‐cost
sustainable
electrochemical
energy
storage
systems
that
complement
the
existing
lithium‐ion
(LIBs).
However,
reported
performance
of
PIBs
is
still
suboptimal,
especially
under
practically
relevant
battery
manufacturing
conditions.
The
primary
challenge
stems
lack
electrolytes
capable
concurrently
supporting
both
low‐voltage
anode
high‐voltage
cathode
with
satisfactory
Coulombic
efficiency
(CE)
cycling
stability.
Herein,
we
report
a
electrolyte
facilitates
commercially
mature
graphite
(>3
mAh
cm
−2
)
to
achieve
an
initial
CE
91.14
%
(with
average
around
99.94
%),
fast
redox
kinetics,
negligible
capacity
fading
for
hundreds
cycles.
Meanwhile,
also
demonstrates
good
compatibility
4.4
V
(
vs
.
K
+
/K)
2
Mn[Fe(CN)
6
]
(KMF)
cathode.
Consequently,
KMF||graphite
full‐cell
without
precycling
treatment
electrodes
can
provide
discharge
voltage
3.61
specific
316.5
Wh
kg
−1
−(KMF+graphite),
comparable
LiFePO
4
||graphite
LIBs,
maintain
71.01
retention
after
2000
Journal of the American Chemical Society,
Год журнала:
2025,
Номер
unknown
Опубликована: Март 26, 2025
Room-temperature
sodium-sulfur
(RT
Na-S)
batteries
are
garnering
interest
owing
to
their
high
theoretical
energy
density
and
low
cost.
However,
the
notorious
shuttle
behavior
of
sodium
polysulfides
(NaPS)
uncontrollable
dendrite
growth
lead
poor
cycle
stability
RT
Na-S
cells.
In
this
work,
we
report
use
1,2-dimethoxypropane
(DMP)
1,1,2,2-tetrafluoroethyl-2,2,2-trifluoroethyl
ether
(TFTFE)
as
inner
solvent
outer
diluent,
respectively,
in
a
localized
high-concentration
electrolyte
system.
Impressively,
asymmetric
DMP
solvent,
introduced
replace
conventional
1,2-dimethoxyethane
(DME),
shields
NaPS
effectively
from
incorporation
into
solvation
structure
due
extra
methyl
groups
molecular
structure.
Furthermore,
TFTFE
which
contains
electron-withdrawing
perfluoro
segments
(-CF3-
-CF2-),
exhibits
significantly
power.
Consequently,
sheath
diluent
further
minimizes
dissolution,
thereby
enhancing
stability.
This
inner-outer
synergistic
effect
leads
formation
highly
effective
cathode-electrolyte
interphase
(CEI)
solid-electrolyte
(SEI)
layers
simultaneously,
alleviating
reducing
side
reactions
between
metal.
Remarkably,
cells
with
designed
present
long-cycling
reversibility
530
mAh
g-1
over
600
cycles
at
C/2
rate
capacity
decay
0.077%
per
cycle.
study
provides
profound
understanding
involving
offers
firm
basis
for
rational
design
electrolytes
rechargeable
metal-sulfur
battery
systems.
The Journal of Physical Chemistry Letters,
Год журнала:
2025,
Номер
unknown, С. 3879 - 3887
Опубликована: Апрель 10, 2025
Weakly
solvating
electrolyte
(WSE)
is
a
promising
and
convenient
strategy
to
regulate
Li+
solvation
structures
promote
the
formation
of
an
anion-driven
robust
solid
interface
layer.
Here,
we
outline
reasonable
workflow
realize
high-throughput
calculations
binding
energy
Li+-solvent
in
stable
conformation
molecular
polarity
index
(MPI)
solvents
replace
value
donor
number
dielectric
constants,
which
are
difficult
obtain
experimentally.
Twenty-six
common
solvent
molecules
used
verify
workflow.
Based
on
output
(binding
MPI
value),
construct
descriptor
(named
Ws)
that
suitable
screen
WSE
it
6
typical
systems
through
experiments,
dynamic
(MD)
simulations,
survival
probability
function.
This
work
demonstrates
universal
useful
distinguish
potential
for
system
can
also
be
developed
other
battery
future.
Abstract
The
thickness
and
composition
of
the
solid
electrolyte
interphase
(SEI)
on
lithium
(Li)
metal
are
critical
factors
influencing
dendrite
growth.
This
study
introduces
a
novel
selection
strategy
based
electrochemical
corrosion
principles.
By
employing
LiCl
LiNO
3
simultaneously,
itself
has
high
donor
number,
low
desolvation
energy,
Li⁺
transference
number
conductivity,
moderate
stability
window.
In
addition,
it
dynamically
reduces
SEI
reactivates
dead
Li,
forming
≈100
nm
enriched
with
LiF
Li
2
O
anode,
which
ensures
stable
cycling
symmetric
cells
for
2000
h
at
current
density
5
mA
cm⁻
.
Consequently,
using
LiFePO
4
(LFP)
as
cathode
‐LiCl‐added
exhibit
excellent
performance
1600
cycles
680
g⁻
1
Even
thin
(5
µm)|LFP
cell
retains
95%
capacity
after
70
170
universality
feasibility
this
design
also
validated
in
diverse
battery
chemistries
such
anode‐free
Cu|LFP,
Li|LiNi
0.8
Mn
0.1
Co
(NMC811),
Li|S
cells,
well
pouch
high‐loading
LFP
NMC811
cathodes,
showcasing
promising
batteries.
Angewandte Chemie International Edition,
Год журнала:
2024,
Номер
unknown
Опубликована: Окт. 10, 2024
Abstract
Free
from
strategically
important
elements
such
as
lithium,
nickel,
cobalt,
and
copper,
potassium‐ion
batteries
(PIBs)
are
heralded
promising
low‐cost
sustainable
electrochemical
energy
storage
systems
that
complement
the
existing
lithium‐ion
(LIBs).
However,
reported
performance
of
PIBs
is
still
suboptimal,
especially
under
practically
relevant
battery
manufacturing
conditions.
The
primary
challenge
stems
lack
electrolytes
capable
concurrently
supporting
both
low‐voltage
anode
high‐voltage
cathode
with
satisfactory
Coulombic
efficiency
(CE)
cycling
stability.
Herein,
we
report
a
electrolyte
facilitates
commercially
mature
graphite
(>3
mAh
cm
−2
)
to
achieve
an
initial
CE
91.14
%
(with
average
around
99.94
%),
fast
redox
kinetics,
negligible
capacity
fading
for
hundreds
cycles.
Meanwhile,
also
demonstrates
good
compatibility
4.4
V
(
vs
.
K
+
/K)
2
Mn[Fe(CN)
6
]
(KMF)
cathode.
Consequently,
KMF||graphite
full‐cell
without
precycling
treatment
electrodes
can
provide
discharge
voltage
3.61
specific
316.5
Wh
kg
−1
−(KMF+graphite),
comparable
LiFePO
4
||graphite
LIBs,
maintain
71.01
retention
after
2000
