In
this
work,
an
(NH4)0.5V2O5
nanobelt
(NVO)
was
prepared
by
a
facile
hydrothermal
reaction
using
NH4VO3
as
the
precursor
and
oxalic
acid
(C2H2O4)
reducing
agent.
The
crystal
structure
quantity
of
NH4+
intercalated
for
NVO
can
be
adjusted
via
postheat
treatment,
resulting
in
variable
K+
storage
property
when
utilized
cathode
K-ion
batteries
(KIBs).
Therein,
NVO-150
°C
obtained
exhibits
optimal
capacity
(86.8
mA
h/g
at
first
discharge
74.0
50th
cycle
under
50
mA/g
between
1.5
3.8
V
vs
K/K+)
rate
capability
(58.4
500
mA/g),
which
ascribed
to
appropriate
structural
fine-tuning
toward
NVO,
increasing
its
active
sites
storage.
Furthermore,
uniformly
combined
with
rGO
one-pot
process
through
bridging
effect
cetyltrimethylammonium
bromide.
acquired
NVO-rGO
also
delivers
significantly
improved
performance
(89.7
initial
71.9
after
cycles;
56.5
mA/g)
compared
benefits
from
good
conductivity
separation
function
rGO,
promoting
fast
transport
electrons
K+.
Both
treatment
introduction
are
feasible
enhance
NVO.
This
study
proposed
effective
modification
strategies
optimize
potential
KIB
application.
Nano-Micro Letters,
Journal Year:
2025,
Volume and Issue:
17(1)
Published: Jan. 31, 2025
Abstract
Potassium-ion
batteries
(PIBs)
are
considered
as
a
promising
energy
storage
system
owing
to
its
abundant
potassium
resources.
As
an
important
part
of
the
battery
composition,
anode
materials
play
vital
role
in
future
development
PIBs.
Bismuth-based
demonstrate
great
potential
for
storing
ions
(K
+
)
due
their
layered
structure,
high
theoretical
capacity
based
on
alloying
reaction
mechanism,
and
safe
operating
voltage.
However,
large
radius
K
inevitably
induces
severe
volume
expansion
depotassiation/potassiation,
sluggish
kinetics
insertion/extraction
limits
further
development.
Herein,
we
summarize
strategies
used
improve
properties
various
types
introduce
recent
advances
design
fabrication
favorable
structural
features
bismuth-based
materials.
Firstly,
this
review
analyzes
working
mechanism
advantages
disadvantages
storage.
Then,
this,
manuscript
focuses
summarizing
modification
including
morphological
design,
compositing
with
other
materials,
electrolyte
optimization,
elucidating
modifications
enhancing
performance.
Finally,
outline
current
challenges
PIBs
put
forward
some
prospects
be
verified.
Advanced Functional Materials,
Journal Year:
2024,
Volume and Issue:
34(26)
Published: Feb. 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
Small,
Journal Year:
2024,
Volume and Issue:
unknown
Published: June 6, 2024
Abstract
In
the
research
report
of
cathode
potassium
ion
battery,
Mn‐based
layered
structural
oxides
have
attracted
researcher's
attention
because
its
good
energy
density
and
high
specific
rate
capacity.
However,
Jahn–Teller
effect
is
main
limiting
factor
for
their
development.
It
leads
to
expansion
deactivation
metal
during
cycling
a
long
time.
Therefore,
mitigation
considered
useful
measure
enhance
electrochemical
capability
oxide.
this
paper,
an
R
3
m‐type
K
0.4
Mn
0.7
Co
0.25
Zn
0.05
O
2
material
designed
through
doping
strategy.
X‐ray
diffraction
techniques
tests
verified
that
effectively
mitigated.
High
performance
achieved
in
capacity
test
with
113
mAh
g
−1
at
50
mA
.
Comparison
similar
materials
recent
years
has
demonstrated
superiority,
leading
among
reported
years.
The
practical
feasibility
assembled
full
cell
soft
carbon
anode
as
cathode.
test,
104.8
discharging
current
density.
