Aqueous
zinc-ion
batteries
(AZIBs)
are
considered
a
promising
option
for
large-scale
energy
storage
because
of
their
low
cost
and
high
safety.
However,
the
lack
suitable
cathode
materials
has
limited
development.
Vanadium-based
oxides
have
been
widely
studied
due
to
layered
crystal
structures
theoretical
specific
capacities.
Nevertheless,
they
prone
vanadium
dissolution
cycle
life
during
cycling.
Pre-embedding
K+
in
V2O5
by
hydrothermal
method
increases
layer
spacing
stabilizes
structure.
Oxygen
vacancies
introduced
provide
more
sites
Zn
storage.
The
results
show
that
K0.39V2O5·0.52H2O
nanostructures
exhibit
stable
cycling
performance.
capacity
is
552
mAh
g–1
at
0.1
A
g–1,
retention
90%
11,000
cycles
10
g–1.
When
electrolyte
changed
from
Zn(CF3SO3)2
ZnSO4,
rate
98%
after
200
1
nearly
100%
2400
This
study
highlights
potential
ion
doping
oxygen
defects
modifying
electrodes
provides
guide
exploring
working
mechanisms
aqueous
batteries.
Aqueous
zinc-ion
batteries
(AZIBs)
are
considered
a
promising
option
for
large-scale
energy
storage
because
of
their
low
cost
and
high
safety.
However,
the
lack
suitable
cathode
materials
has
limited
development.
Vanadium-based
oxides
have
been
widely
studied
due
to
layered
crystal
structures
theoretical
specific
capacities.
Nevertheless,
they
prone
vanadium
dissolution
cycle
life
during
cycling.
Pre-embedding
K+
in
V2O5
by
hydrothermal
method
increases
layer
spacing
stabilizes
structure.
Oxygen
vacancies
introduced
provide
more
sites
Zn
storage.
The
results
show
that
K0.39V2O5·0.52H2O
nanostructures
exhibit
stable
cycling
performance.
capacity
is
552
mAh
g–1
at
0.1
A
g–1,
retention
90%
11,000
cycles
10
g–1.
When
electrolyte
changed
from
Zn(CF3SO3)2
ZnSO4,
rate
98%
after
200
1
nearly
100%
2400
This
study
highlights
potential
ion
doping
oxygen
defects
modifying
electrodes
provides
guide
exploring
working
mechanisms
aqueous
batteries.
