A
single-phase
layer-structured
high
entropy
oxide
O3-Na(MgCu)1/12(NiCoFeMnTi)1/6O2
(HEO-MgCuNi)
has
been
synthesized
and
investigated
as
cathode
in
sodium
ion
battery.
The
as-synthesized
delivers
a
discharge
capacity
of
146.6
mAh
g-1
at
10
mA
g-1,
can
retain
83.2%
after
700
cycles
100
between
2.0
4.1
V
vs.
Na+/Na.
reversible
O3-P3
phase-transition
takes
place
during
the
charge/discharge
process.
In
addition,
electronic
local
structures
electrochemical
active
centres
(Ni,
Cu,
Co,
Fe)
are
enormously
reversible.
Particularly,
highly
Fe3+/Fe4+
redox
was
revealed
by
X-ray
absorption
fine
structure
(XAFS).
Meanwhile,
Mn
Ti
stabilize
layered
without
alternation
their
oxidation
states.
crystal
structure,
synergistically
enable
HEO-MgCuNi
long
cycle
life.
Small,
Journal Year:
2025,
Volume and Issue:
unknown
Published: April 17, 2025
Abstract
Sodium‐ion
batteries
(SIBs)
gain
attention
as
a
promising,
cost‐effective,
and
resource‐abundant
alternative,
especially
for
large‐scale
energy
storage.
Cathode
materials
play
pivotal
role
in
improving
the
electrochemical
performance
of
SIBs,
with
high‐voltage
cathodes
providing
enhanced
density
rate
capacity,
making
SIBs
suitable
high‐power
applications.
Common
cathode
materials,
such
layered
transition
metal
oxides,
polyanionic
compounds,
Prussian
blue
analogs,
each
offer
unique
benefits.
However,
these
face
challenges
under
conditions,
phase
transitions,
cation
migration,
oxygen
loss,
electrolyte
degradation.
This
review
discusses
strategies
to
address
challenges,
including
elemental
doping,
surface
coatings,
modified
synthesis
methods,
interfacial
adjustments,
all
aimed
at
enhancing
stability
materials.
Here
also
explores
how
full‐cell
design
optimizations
can
further
improve
power
density.
By
analyzing
material
degradation
failure
modes,
this
offers
insights
into
development
stable,
high‐performance
better
safety
broader
application
potential
storage
technologies.
Advanced Functional Materials,
Journal Year:
2025,
Volume and Issue:
unknown
Published: May 2, 2025
Abstract
The
sodium‐layered
transition
metal
oxides
(Na
x
TMO
2
)
are
regarded
as
the
promising
cathode
for
sodium‐ion
batteries
(SIBs)
relying
on
their
high
theory
capacity
and
cost‐effectiveness.
Nevertheless,
intrinsic
lattice
distortions
caused
by
Jahn‐Teller
active
ions
significantly
degrade
structural
stability
of
Na
,
generally
resulting
in
unsatisfactory
electrochemical
properties.
In
this
review,
begins
introducing
inducement
mechanisms
effect
(TM)
ions.
Subsequently,
restraining
strategies
well
corresponding
using
element
doping/substitutions,
surface
reconstructions,
polyphase
symbiosis,
TM/oxygen/Na
+
vacancy
manipulations
summarized
detail.
Specifically,
influences
such
mitigation
deformation
properties,
phase
evolution
behaviors,
TM
dissolution
characteristics,
crystal
comprehensively
discussed.
Furthermore,
sensible
utilization
distortion
is
to
build
cathodes
with
and/or
repaid
ion
transport
kinetics
well.
end,
challenges
faced
amelioration
methods
overviewed
put
forward
research
directions
future
trenchantly
constrain
6
octahedron
deformation.
This
work
will
provide
more
perceptions
further
studies
SIBs.
ChemSusChem,
Journal Year:
2024,
Volume and Issue:
unknown
Published: June 13, 2024
Layered
transition
metal
oxides
are
widely
considered
as
ideal
cathode
materials
for
SIBs.
However,
the
existing
P2
and
O3
structures
possess
specific
issues,
which
limit
their
practical
applications.
To
address
these
this
work
designed
a
novel
intergrowth
layered
oxide
with
phases
by
implementing
Cu
Ti
into
structure
formation
of
high-entropy
superior
performance
The
electrochemical
test
results
show
that
optimized
P2/O3
possesses
high
initial
discharge
capacity
157.85
mAh
g
Journal of Materials Chemistry A,
Journal Year:
2024,
Volume and Issue:
12(29), P. 17756 - 17770
Published: Jan. 1, 2024
This
Highlight
explores
advancements
in
Ni-rich
cathode
materials
for
sodium-ion
batteries,
which
offer
practical
synthesis
methods,
high
specific
capacity,
and
environmental
benefits
while
addressing
energy
density
cycle
life
challenges.
