Nano Letters,
Journal Year:
2024,
Volume and Issue:
24(32), P. 9793 - 9800
Published: Aug. 1, 2024
O3-type
layered
oxides
have
been
extensively
studied
as
cathode
materials
for
sodium-ion
batteries
due
to
their
high
reversible
capacity
and
initial
sodium
content,
but
they
suffer
from
complex
phase
transitions
an
unstable
structure
during
intercalation/deintercalation.
Herein,
we
synthesize
a
high-entropy
transition
metal
oxide,
NaNi0.3Cu0.05Fe0.1Mn0.3Mg0.05Ti0.2O2
(NCFMMT),
by
simultaneously
doping
Cu,
Mg,
Ti
into
its
layers,
which
greatly
increase
structural
entropy,
thereby
reducing
formation
energy
enhancing
stability.
The
NCFMMT
exhibits
significantly
improved
cycling
stability
(capacity
retention
of
81.4%
at
1C
after
250
cycles
86.8%
5C
500
cycles)
compared
pristine
NaNi0.3Fe0.4Mn0.3O2
(71%
100
1C),
well
remarkable
air
Finally,
the
NCFMMT//hard
carbon
full-cell
deliver
103
mAh
g–1
1C,
with
83.8
maintained
300
81.4%).
ACS Omega,
Journal Year:
2024,
Volume and Issue:
9(21), P. 22509 - 22531
Published: May 13, 2024
The
significant
consumption
of
fossil
fuels
and
the
increasing
pollution
have
spurred
development
energy-storage
devices
like
batteries.
Due
to
their
high
cost
limited
resources,
widely
used
lithium-ion
batteries
become
unsuitable
for
large-scale
energy
production.
Sodium
is
considered
be
one
most
promising
substitutes
lithium
due
its
wide
availability
similar
physiochemical
properties.
Designing
a
suitable
cathode
material
sodium-ion
essential,
as
overall
electrochemical
performance
battery
depend
on
material.
Among
different
types
materials,
polyanionic
has
emerged
great
option
higher
redox
potential,
stable
crystal
structure,
open
three-dimensional
framework.
However,
poor
electronic
ionic
conductivity
limits
applicability.
This
review
briefly
discusses
strategies
deal
with
challenges
transition-metal
oxides
Prussian
blue
analogue,
recent
developments
in
compounds,
improve
by
nanostructuring,
surface
coating,
morphology
control,
heteroatom
doping,
which
expected
accelerate
future
design
cathodes.
Nano Letters,
Journal Year:
2024,
Volume and Issue:
24(32), P. 9793 - 9800
Published: Aug. 1, 2024
O3-type
layered
oxides
have
been
extensively
studied
as
cathode
materials
for
sodium-ion
batteries
due
to
their
high
reversible
capacity
and
initial
sodium
content,
but
they
suffer
from
complex
phase
transitions
an
unstable
structure
during
intercalation/deintercalation.
Herein,
we
synthesize
a
high-entropy
transition
metal
oxide,
NaNi0.3Cu0.05Fe0.1Mn0.3Mg0.05Ti0.2O2
(NCFMMT),
by
simultaneously
doping
Cu,
Mg,
Ti
into
its
layers,
which
greatly
increase
structural
entropy,
thereby
reducing
formation
energy
enhancing
stability.
The
NCFMMT
exhibits
significantly
improved
cycling
stability
(capacity
retention
of
81.4%
at
1C
after
250
cycles
86.8%
5C
500
cycles)
compared
pristine
NaNi0.3Fe0.4Mn0.3O2
(71%
100
1C),
well
remarkable
air
Finally,
the
NCFMMT//hard
carbon
full-cell
deliver
103
mAh
g–1
1C,
with
83.8
maintained
300
81.4%).
