Advanced Energy Materials,
Год журнала:
2024,
Номер
unknown
Опубликована: Июль 3, 2024
Abstract
Potassium‐ion
batteries
(PIBs)
are
considered
as
competitive
candidates
for
energy
storage
applications
due
to
their
abundant
resources
and
low
cost.
K
2
Mn[Fe(CN)
6
]
(KMnF)
is
an
ideal
cathode
PIBs
because
of
its
high
theoretical
specific
(≈600
Wh
kg
−1
).
However,
it
suffers
from
severe
Mn
dissolution
complex
phase
transitions
caused
by
Jahn–Teller
distortion,
resulting
in
rapid
capacity
decay.
Here,
a
simple,
controllable
universal
“transition
metal
(TM
2+
)
ion
exchange”
strategy
proposed
modulate
the
surface
lattice
KMnF,
not
only
stabilizing
structure
but
also
maintaining
inherent
capacity.
The
substituted
TM
,
including
Fe
Ni
Cu
or
Co
forming
heterogeneous
protection
layer.
Especially
when
modified
redox‐active
exhibits
144
mAh
g
considerable
density
560
remarkable
retention
(86%
after
1,000
cycles
at
50
mA
71%
5,000
respectively).
surface‐modified
KMnF
proved
be
effective
preventing
formation
tetragonal
distortion.
This
work
provides
simple
high‐energy
Mn‐based
cathode.
Abstract
Mn‐based
layered
oxide
is
extensively
investigated
as
a
promising
cathode
material
for
potassium‐ion
batteries
due
to
its
high
theoretical
capacity
and
natural
abundance
of
manganese.
However,
the
Jahn–Teller
distortion
caused
by
high‐spin
Mn
3+
(t
2g
3
e
g
1
)
destabilizes
host
structure
reduces
cycling
stability.
Here,
K
0.02
Na
0.55
0.70
Ni
0.25
Zn
0.05
O
2
(denoted
KNMNO‐Z)
reported
inhibit
effect
reduce
irreversible
phase
transition.
Through
implementation
Zn‐doping
strategy,
higher
valence
achieved
in
KNMNO‐Z
electrode,
resulting
reduction
amount
subsequently
leading
an
improvement
cyclic
Specifically,
after
1000
cycles,
retention
rate
97%
observed.
Density
functional
theory
calculations
reveals
that
low‐valence
2+
ions
substituting
transition
metal
position
regulated
electronic
around
MnO
bonding,
thereby
alleviating
anisotropic
coupling
between
oxidized
2−
4+
improving
structural
provided
initial
discharge
57
mAh
−1
at
100
mA
decay
only
0.003%
per
cycle,
indicating
Zn‐doped
strategy
effective
developing
high‐performance
materials
PIBs.
Angewandte Chemie,
Год журнала:
2024,
Номер
136(29)
Опубликована: Май 6, 2024
Abstract
Current
potassium‐ion
batteries
(PIBs)
are
limited
in
safety
and
lifetime
owing
to
the
lack
of
suitable
electrolyte
solutions.
To
address
these
issues,
herein,
we
report
an
innovative
non‐flammable
design
strategy
that
leverages
optimal
moderate
solvation
phosphate‐based
solvent
which
strikes
a
balance
between
capability
salt
dissociation
ability,
leading
superior
electrochemical
performance.
The
formulated
simultaneously
exhibits
advantages
low
concentration
(only
0.6
M),
viscosity,
high
ionic
conductivity,
oxidative
stability,
safety.
Our
also
promotes
formation
self‐limiting
inorganic‐rich
interphases
at
anode
surface,
alongside
robust
cathode‐electrolyte
interphase
on
iron‐based
Prussian
blue
analogues,
mitigating
electrode/electrolyte
side
reactions
preventing
Fe
dissolution.
Notably,
PIBs
employing
our
exhibit
exceptional
durability,
with
80
%
capacity
retention
after
2,000
cycles
high‐voltage
4.2
V
coin
cell.
Impressively,
larger
scale
pouch
cell,
it
maintains
over
81
its
initial
1,400
1
C‐rate
average
Coulombic
efficiency
99.6
%.
This
work
represents
significant
advancement
toward
realization
safe,
sustainable,
high‐performance
PIBs.
ACS Energy Letters,
Год журнала:
2024,
Номер
9(7), С. 3536 - 3546
Опубликована: Июнь 28, 2024
The
design
of
electrolytes
that
are
compatible
with
graphite
electrodes
and
incorporate
flame-retardant
properties
in
potassium-ion
batteries
(PIBs)
can
not
only
facilitate
their
commercialization
but
also
improve
the
safety
reliability.
However,
it
remains
challenging,
particularly
propylene
carbonate
(PC)-based
electrolytes.
Herein,
we
achieved
a
highly
reversible
K+
(de)intercalation
PC-based
by
introducing
fluoroethers.
We
identified
strength
interactions
formed
between
fluoroethers
(e.g.,
1,1,2,2-tetrafluoroethy-2,2,3,3-tetrafluoropropyl
ether
(HFE),
1,1,2,2-tetrafluoroethyl
2,2,2-trifluoroethyl
(TFTFE))
PC
heteronuclear
overhauser
effect
spectroscopy.
find
interaction
HFE
is
stronger,
which
significantly
weaken
K+-PC
interaction,
contributing
to
endowing
electrolyte
nonflammable
features.
kinetic
thermodynamic
K+-solvent-anion
complexes
proposed
interfacial
model
elucidate
electrode
stability,
enabling
as-designed
sulfur
show
high
performance.
This
discovery
offers
fresh
perspective
for
designing
advancing
PIBs
beyond.
Advanced Functional Materials,
Год журнала:
2024,
Номер
34(26)
Опубликована: Фев. 26, 2024
Abstract
The
development
of
potassium‐ion
batteries
(KIBs)
relies
on
the
exploration
stable
layer‐structured
oxide
cathode
materials
and
a
comprehensive
understanding
ion
storage
diffusion
behaviors.
A
multiphase
riveting‐structured
O3/P2/P3‐Na
0.9
[Ni
0.3
Mn
0.55
Cu
0.1
Ti
0.05
]O
2
(Tri‐NMCT)
is
employed
as
material
for
KIBs.
It
demonstrates
an
initial
discharge
specific
capacity
108
mA
g
−1
at
current
density
15
in
voltage
range
1.5–4
V.
Excellent
cyclic
stability
exhibited
well
with
high
83%
retention
after
600
cycles
higher
300
.
Based
in‐situ
XRD,
it
reveals
that
P2
phase
offers
more
triangular
prism
site
compared
to
O3
phase.
This
inhibits
undesired
transition
from
P3
during
discharge,
thereby
ensuring
long‐term
performance.
Furthermore,
Density
state
(DOS)
calculations
migration
barrier
analyses
indicate
preferential
K
+
ions
due
lower
Fermi
level.
observation
elucidates
structural
preservation
embedding.
Overall,
this
work
sheds
light
Tri‐NMCT
promising
advanced
Advanced Functional Materials,
Год журнала:
2024,
Номер
unknown
Опубликована: Июль 18, 2024
Abstract
Over
the
past
decade,
concerns
over
sustainability
of
lithium‐ion
batteries
(LIBs)
have
arisen
due
to
scarcity
critical
elements
such
as
lithium
(Li),
nickel
(Ni),
and
cobalt
(Co),
prompting
exploration
alternative
complementary
electrochemical
energy
storage
technologies.
Due
more
abundant
resources
compared
contemporary
LIBs
potentially
higher
specific
than
emerging
sodium‐ion
(SIBs),
potassium‐ion
(PIBs)
attracted
intensive
research
interest
a
promising
existing
Nevertheless,
development
practical
PIBs
remains
in
its
infancy.
In
this
perspective,
various
electrode
materials
electrolytes
reported
for
from
an
application
point
view
identifying
most
ones
with
high
are
first
concisely
discussed.
Then,
pack‐level
energy,
density,
cost
analyses
presented
several
chemistries,
which
also
representative
SIBs
demonstrate
advantages
PIBs.
After
that,
succinct
discussion
is
evaluate
practicality
potassium
metal
batteries.
Finally,
challenges
associated
commercialization
PIBs,
providing
future
fronts
high‐performance
outlined.
The
growing
market
for
sodium-ion
batteries
has
stimulated
interest
in
research
on
Prussian
blue-type
cathode
materials.
Iron
hexacyanoferrate
(FeHCF)
is
considered
a
desirable
cathode,
but
the
incomplete
electrochemical
property
of
its
low-spin
iron
sites
hinders
further
practical
application.
In
this
paper,
carboxymethyl
cellulose
demonstrated
to
have
an
appropriate
binding
energy
through
DFT
calculations,
synthesize
blue
situ,
balance
Fe3+
and
water
FeHCF,
introduce
FeIII
vacancies
activate
Fe
sites.
Thus,
at
1
C
rate,
it
achieves
initial
discharge
capacity
154.7
mAh
g–1
with
density
470.8
Wh
kg–1.
retention
70.2%
after
4000
cycles
rate
100
C.
This
work
provides
simpler
way
develop
more
cost-effective,
faster,
durable
materials
storage.
Advanced Materials,
Год журнала:
2025,
Номер
unknown
Опубликована: Янв. 22, 2025
Abstract
Potassium‐ion
batteries
(PIBs),
with
abundant
resources
and
low
cost,
are
considered
as
a
promising
alternative
to
commercial
lithium‐ion
for
low‐cost
large‐scale
applications.
Over
the
past
decade,
significant
academic
progresses
made
in
development
of
PIBs,
including
advancements
cathodes,
anodes,
electrolytes.
However,
most
improvements
achieved
under
laboratory
conditions
(e.g.,
K
metal‐based
half‐cells
mass
loading
active
materials),
performance
PIBs
full
cells
is
still
far
from
requirements
A
critical
insight
bridging
research
commercialization
urgently
needed
guide
future
this
field.
This
review
will
discuss
challenges
improvement
strategies
focusing
on
potential
practical
electrolytes,
well
their
cells.
It
aims
give
readers
clear
logical
understanding
PIBs.
The
application
analysis
also
discussed
provide
comprehensive
Finally,
perspectives
provided
