Elevating the Concentration of Na Ions to 1 in P2 Type Layered Oxide Cathodes
Advanced Functional Materials,
Journal Year:
2025,
Volume and Issue:
unknown
Published: Jan. 16, 2025
Abstract
Layered
oxide
cathodes,
particularly
those
with
P2
and
P3
type
structures,
have
lower
specific
capacities
limited
by
the
Na‐ion
content
in
their
structure.
In
this
study,
Na
is
elevated
to
its
uppermost
limit
a
cathode.
The
material
synthesized
monophasic
P3,
(with
minor
O3
phase),
biphasic
P3/P2
configuration.
During
electrochemical
testing,
compounds
exhibited
excellent
performance,
reaching
102
87
mAh
g
−1
,
respectively,
at
6C.
A
full
cell
fabricated
using
cathode
demonstrated
capacity
of
123
0.1C
retained
90%
initial
after
200
cycles
0.2C.
structural
integrity
both
materials
supported
operando
synchrotron
X‐ray
diffraction
data,
which
showed
no
phase
transformations
showing
only
0.78%
variation
unit
volume.
These
findings
highlight
transformative
potential
achieving
high
concentrations
P2‐type
materials,
paving
way
for
developing
high‐performance
sodium‐ion
batteries.
Language: Английский
Probing the Compositional and Structural Effects on the Electrochemical Performance of Na(Mn‐Fe‐Ni)O2 Cathodes in Sodium‐Ion Batteries
Battery energy,
Journal Year:
2025,
Volume and Issue:
unknown
Published: March 22, 2025
ABSTRACT
This
study
systematically
investigates
an
Mn‐Fe‐Ni
pseudo‐ternary
system
for
Na(Mn‐Fe‐Ni)O
2
cathodes,
focusing
on
the
effects
of
varying
transition
metal
fractions
structural
and
electrochemical
properties.
X‐ray
diffraction
reveals
that
increasing
Mn
content
induces
biphasic
behavior.
A
higher
Ni
reduces
c
parameter,
while
Fe
concentrations
expand
lattice.
Average
particle
size
increases
with
increase
in
Fe/Ni
ratio.
NaMn
0.500
0.125
0.375
O
delivers
a
high
specific
capacity
~149
mAh
g⁻¹
2.0–4.0
V
range.
Galvanostatic
charge‐discharge
dQ/dV
versus
curves
suggest
Ni/Fe
ratio
>
1
enhances
lowers
voltage
polarization
materials.
0.250
demonstrated
best
rate
performance,
exhibiting
85.7%
at
1C
69.7%
3C,
compared
to
0.1C,
0.625
(MFN‐512)
excelled
cyclic
stability,
retaining
93%
after
100
cycles.
The
performance
MFN‐512
full
cell
configuration
was
studied
hard
carbon
as
anode,
resulting
~92
g
−1
nominal
~2.9
0.1C
rate,
demonstrating
its
potential
practical
applications.
Transmission
electron
microscopy
confirmed
nature
MFN‐512,
columnar
growth
P2
O3
phases.
Electrochemical
impedance
spectroscopy
revealed
better‐performing
samples
have
lower
charge
transfer
resistance.
Operando
Synchrotron
XRD
reversible
phase
transformations
driven
by
optimized
ratios
fraction.
work
outlines
systematic
approach
optimizing
low‐cost,
high‐performance
layered
oxides.
Language: Английский
Durable Cu-doped P3-Na0.62Mn1-xCuxO2 Cathodes for High-Capacity Sodium-ion Battery
Journal of Materials Chemistry A,
Journal Year:
2025,
Volume and Issue:
unknown
Published: Jan. 1, 2025
Cu
doping
enhances
the
P3-Na
0.62
Mn
0.75
0.19
O
2
cathode's
performance
in
sodium-ion
batteries.
It
improves
electrochemical
properties,
structural
stability,
and
battery
performance,
making
it
a
promising
material
for
energy
storage
applications.
Language: Английский
Ti-Substitution Facilitating Anionic Redox and Cycle Stability in a P2-Type Na2/3Mn2/3Ni1/3O2 Na-Ion Battery Cathode
Energy & Fuels,
Journal Year:
2025,
Volume and Issue:
39(6), P. 3348 - 3358
Published: Jan. 30, 2025
P2-type
layered
oxides
have
attracted
tremendous
attention
as
the
leading
candidate
for
cathode
material
in
Na-ion
batteries
owing
to
their
ease
of
synthesis
and
facile
diffusion.
In
this
work,
an
in-depth
investigation
electrochemical
behavior
(space
group
P63/mmc)
10%
Ti-doped
Na2/3Mn2/3Ni1/3O2
is
carried
out
different
voltage
ranges
(1.5-4.0
V,
2.0-4.0
2.0-4.5
V).
Ti4+
doping
found
disrupt
Na-ion/vacancy
ordering
increase
Na-O2
layer
spacings,
which
results
improved
rate
performance
(~68
mAh
g-1
at
5C
V
range).
range,
Na2/3Mn0.567Ti0.100Ni1/3O2
(NMNT)
exhibits
a
reduced
initial
specific
discharge
capacity
140
significantly
retention
71%
after
100
cycles
due
enhanced
reversibility
anionic
redox.
Better
charge-discharge
cycling
stability
NMNT
(80%
0.33C
1.5-4.0
range)
evidences
Ti4+-induced
disruption
cooperative
Jahn-Teller
distortion.
Galvanostatic
intermittent
titration
confirm
higher
Na+
diffusion
coefficients
NMNT.
Interestingly,
marginally
cathode-electrolyte
interphase
resistance
endorsed
by
impedance
measurements,
while
overall
cell
charge-transfer
are
much
lower
(by
~45%
~56.7%,
respectively)
than
Na2/3Mn2/3Ni1/3O2.
Language: Английский