Nano Letters,
Journal Year:
2025,
Volume and Issue:
unknown
Published: April 11, 2025
Layered
transition-metal
(TM)
oxides
are
of
high
application
value
as
a
cathode
for
potassium
(K)-ion
batteries
toward
energy
density.
However,
the
inadequate
covalency
TM-O
bond
inevitably
induces
TM
migration
and
subsequent
irreversible
structural
transformation
upon
operating,
which
results
in
poor
rate
long
cycle
reliability.
To
address
this
issue,
we
employed
boron
coordination
chemistry
to
manipulate
local
electronic
structure
prototype
P2-layered
K0.5Mn0.8Ni0.15B0.05O2
(KMNBO).
The
B
ions
with
electronegativity
reside
slabs
boost
layered
by
attracting
an
tendency
surrounding
oxygen,
upgrades
tolerance
during
repeated
K-ion
(de)intercalation
process.
sluggish
intrinsic
K+
could
be
simultaneously
alleviated
reducing
Coulomb
force
between
K
O.
This
study
breaks
stereotype
crystal
lattice
provides
new
insight
into
developing
long-durability
cathodes.
Interdisciplinary materials,
Journal Year:
2024,
Volume and Issue:
unknown
Published: Sept. 29, 2024
Abstract
The
poor
electronic
conductivity
of
conversion‐type
materials
(CMs)
and
the
dissolution/diffusion
loss
transition
metal
(TM)
ions
in
electrodes
seriously
hinder
practical
applications
potassium
ion
batteries.
Simply
optimizing
electrode
or
designing
components
is
no
longer
effective
improving
performance
CMs.
Binders,
as
one
components,
play
a
vital
role
electrochemical
Here
we
rationally
designed
FeF
2
for
first
time
by
with
introduction
carbon
nanotubes
(CNTs)
combined
sodium
alginate
(SA)
binder
based
on
strong
interactions.
We
show
that
@CNTs‐SA
cathode
does
not
suffer
from
TM
dissolution
delivers
high
capacity
184.7
mAh
g
−1
at
10
mA
.
Moreover,
99.2
after
100
cycles
,
which
twofold
increase
compared
to
@CNTs‐PVDF.
After
calculating
average
decay
rate
per
cycle
them,
find
about
one‐third
lower
than
Therefore,
SA
can
be
broadly
used
comprising
several
CMs,
providing
meaningful
insights
into
mechanisms
lead
their
improved
performances.
Angewandte Chemie,
Journal Year:
2024,
Volume and Issue:
136(28)
Published: May 7, 2024
Abstract
Alkali
metals
(e.g.
Li,
Na,
and
K)
multivalent
Zn,
Mg,
Ca,
Al)
have
become
star
anodes
for
developing
high‐energy‐density
rechargeable
batteries
due
to
their
high
theoretical
capacity
excellent
conductivity.
However,
the
inevitable
dendrites
unstable
interfaces
of
metal
pose
challenges
safety
stability
batteries.
To
address
these
issues,
covalent
organic
frameworks
(COFs),
as
emerging
materials,
been
widely
investigated
regular
porous
structure,
flexible
molecular
design,
specific
surface
area.
In
this
minireview,
we
summarize
research
progress
COFs
in
stabilizing
anodes.
First,
present
origins
delve
into
advantages
based
on
physical/chemical
properties
alkali
metals.
Then,
special
attention
has
paid
application
host
design
anodes,
artificial
solid
electrolyte
interfaces,
additives,
solid‐state
electrolytes,
separator
modifications.
Finally,
a
new
perspective
is
provided
from
pore
modulation,
synthesis
COFs.
Angewandte Chemie,
Journal Year:
2024,
Volume and Issue:
136(28)
Published: April 25, 2024
Abstract
The
interfacial
electric
field
(IEF)
in
the
heterostructure
can
accelerate
electron
transport
and
ion
migration,
thereby
enhancing
electrochemical
performance
of
potassium‐ion
batteries
(PIBs).
Nevertheless,
quantification
modulation
IEF
for
high‐efficiency
PIB
anodes
currently
remains
a
blank
slate.
Herein,
we
achieve
first
time
tuning
via
amorphous
carbon‐coated
undifferentiated
cobalt‐doped
FeSe/Fe
3
Se
4
(denoted
UN‐CoFe
5
/C)
efficient
potassium
storage.
Co
doping
increase
,
improving
transport,
promoting
adsorption
capacity,
lowering
diffusion
barrier.
As
expected,
magnitude
/C
is
experimentally
quantified
as
62.84
mV,
which
3.65
times
larger
than
that
(Fe
/C).
Benefiting
from
strong
IEF,
anode
exhibits
superior
rate
capability
(145.8
mAh
g
−1
at
10.0
A
)
long
cycle
lifespan
(capacity
retention
95.1
%
over
3000
cycles
1.0
).
Furthermore,
this
strategy
universally
regulate
CoSe
2
/Co
9
8
FeS
/Fe
7
S
heterostructures.
This
work
provide
fundamental
insights
into
design
advanced
electrodes.
Energy & Environmental Science,
Journal Year:
2024,
Volume and Issue:
17(19), P. 7362 - 7371
Published: Jan. 1, 2024
Ultrasmall
high-entropy
perovskite
fluoride
nanoparticles
impregnated
in
carbon
nanofibers
are
prepared
by
electrospinning
and
pyrolysis.
The
unique
structure
prevents
the
conversion
reaction
shows
a
low-strain
intercalation
mechanism.
Advanced Energy Materials,
Journal Year:
2024,
Volume and Issue:
unknown
Published: July 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.
Angewandte Chemie,
Journal Year:
2024,
Volume and Issue:
136(35)
Published: June 13, 2024
Abstract
Metal
hexacyanoferrates
(HCFs)
are
regarded
as
promising
cathode
materials
for
potassium‐ion
batteries
(PIBs)
on
account
of
their
low
cost
and
high
energy
density.
However,
the
difficult‐to‐remove
[Fe(CN)
6
]
vacancies
crystal
water
lead
to
structural
instability
capacity
deterioration
well
stereotype
poor
thermostability
conventional
HCFs.
Herein,
we
report
(100)
face‐oriented
potassium
magnesium
hexacyanoferrate
(KMgHCF)
nanoplates
with
crystallinity,
enabling
up
550
°C,
high‐temperature
carbon
coating
elimination.
The
as‐obtained
KMgHCF/C
exhibit
superior
storage
properties,
including
a
large
reversible
84.6
mAh
g
−1
,
voltage
plateau
3.87
V,
excellent
long‐term
cycling
performance
over
15000
cycles
rate
capability
at
5
A
.
unprecedented
stability
is
attributed
synergistic
effect
highly
two‐phase
reaction,
no
water,
specially
exposed
steady
surface,
protective
coating.
This
work
provides
new
material
selection
modification
strategy
practical
application
HCFs
in
PIBs.
