Energy & Fuels,
Journal Year:
2024,
Volume and Issue:
unknown
Published: Dec. 11, 2024
The
paradigm
shift
in
energy
demands
has
mandated
the
development
of
a
feasible
alternative
and
sustainable
battery
chemistry
such
as
K-ion
batteries
that
deliver
desired
density
complement
existing
expensive
Li-ion
batteries.
Therefore,
identifying
improving
suitable
cathodes
with
promising
stability
at
high
operating
voltage
is
necessary.
In
this
context,
comprehensive
analysis
was
carried
out
to
synthesize
Ni
Fe-substituted
manganese-based
Prussian
blue
analogues.
Structural
characterizations
revealed
formation
solid
solution
by
observing
slightly
altered
unit
cell
parameters.
simultaneous
precipitation
transition
metal
ions
resulted
smaller
primary
particle
sizes
∼60
nm,
facilitating
facile
diffusion
K-ions.
Simultaneously,
local
electron
distribution
−CN–
coordination
around
M–N
bonds
(Ni
Fe)
environment
significantly
improved
electrochemical
performance.
behavior
during
(de)potassiation
under
competing
electrochemically
active
(Mn
inactive
(Ni)
substitution
mitigated
detrimental
Jahn–Teller
effect
Mn2+/3+
lowered
average
discharge
potential
from
3.75
3.72
V
vs
K/K+.
This
ultimately
rate
capability
PBMNF-712
(KxMn0.7Ni0.1Fe0.2[Fe(CN)6])
dramatically
88
mAh/g,
whereas
PBM
(KxMn[Fe(CN)6])
delivered
only
48
mAh/g
current
1000
mA/g
reduced
charge
transfer
resistance.
approach
demonstrated
robust
cycling
500
mA/g,
delivering
specific
capacity
93
even
after
300
cycles.
ACS Energy Letters,
Journal Year:
2025,
Volume and Issue:
unknown, P. 750 - 778
Published: Jan. 13, 2025
Fast-charging
technology,
which
reduces
charging
time
and
enhances
convenience,
is
attracting
attention.
Sodium-ion
batteries
(SIBs)
potassium-ion
(PIBs)
are
emerging
as
viable
alternatives
to
lithium-ion
(LIBs)
due
their
abundant
resources
low
cost.
However,
during
fast
discharging,
the
crystal
structures
of
cathode
materials
in
SIBs/PIBs
can
be
damaged,
negatively
impacting
performance,
lifespan,
capacity.
To
address
this,
there
a
need
explore
electrode
with
ultrahigh
rate
capabilities.
Prussian
Blue
its
analogues
(PB
PBAs)
have
shown
great
potential
for
both
SIBs
PIBs
unique
excellent
electrochemical
properties.
This
Review
examines
use
PBAs
PIBs,
focusing
on
fast-charging
(rate)
performance
commercialization
potential.
Through
systematic
analysis
discussion,
we
hope
provide
practical
guidance
developing
contributing
advancement
widespread
adoption
green
energy
technologies.
Research Square (Research Square),
Journal Year:
2025,
Volume and Issue:
unknown
Published: Feb. 4, 2025
Abstract
Prussian
blue
analogues
(PBAs)
with
3D
cyanide-bridged
frameworks
exhibit
significant
potential
as
cathode
materials
for
sodium-ion
batteries.
However,
the
dissolution
of
transition
metals
and
structural
distortion
often
lead
to
instability,
causing
serious
capacity
degradation
during
cycling.
Fundamental
understanding
tuning
coordination
electronic
structure
mitigate
PBAs
instability
remain
challenging.
Herein,
we
address
these
challenges
by
modulating
local
surrounding
high-spin
optimize
cyanide
environment,
enabling
a
uniform
electron
distribution
within
crystal
structure.
The
resulting
enhances
reactivity
metals,
which
helps
achieve
95.7%
theoretical
capacity.
More
importantly,
regulation
displacement
environment
significantly
improves
stability,
yielding
an
impressive
retention
91.7%
after
1000
cycles.
These
findings
provide
new
insights
into
chemistry
offer
valuable
guidance
development
advanced
Battery energy,
Journal Year:
2025,
Volume and Issue:
unknown
Published: Feb. 16, 2025
ABSTRACT
Sodium‐layered
oxides
are
a
promising
category
of
cathodes
for
sodium‐ion
batteries
with
high
energy
densities.
The
solid‐state
method
is
the
typical
approach
to
synthesizing
these
because
its
simple
procedure
and
low
cost.
Although
reaction
conditions
have
usually
been
understated,
effect
reagents
has
often
overlooked.
Thus,
fundamental
insight
into
chemical
required
perform
well.
Here
we
report
in
situ
structural
electrochemical
methods
studying
using
different
reagents.
materials
composite
structure
containing
layered
NaMnO
2
Li
MnO
3
components,
where
oxygen
anionic
redox
can
be
triggered
at
voltage
by
forming
Na–O–Li
configurations.
samples
synthesized
via
MnCO
‐based
precursors
form
phase
evaluated
temperature
better
than
those
through
precursors.
This
work
demonstrates
that
also
impact
performance
sodium‐layered
oxides,
which
provides
new
developing
high‐energy
cathode
material.
