Angewandte Chemie International Edition,
Journal Year:
2023,
Volume and Issue:
62(15)
Published: Feb. 13, 2023
Manganese-rich
layered
oxide
cathodes
of
sodium-ion
batteries
(SIBs)
are
extremely
promising
for
large-scale
energy
storage
owing
to
their
high
capacities
and
cost
effectiveness,
while
the
Jahn-Teller
(J-T)
distortion
low
operating
potential
Mn
redox
largely
hinder
practical
applications.
Herein,
we
reveal
that
annealing
in
argon
rather
than
conventional
air
is
a
universal
strategy
comprehensively
upgrade
Na-storage
performance
Mn-based
cathodes.
Bulk
oxygen
vacancies
introduced
via
this
method,
leading
reduced
valence,
lowered
3d-orbital
level,
formation
new-concept
domains.
As
result,
density
model
P2-Na0.75
Mg0.25
Mn0.75
O2
cathode
increases
by
≈50
%
benefiting
from
improved
specific
capacity
redox.
The
domains
can
disrupt
cooperative
J-T
distortion,
greatly
promoting
cycling
stability.
This
exciting
finding
opens
new
avenue
towards
high-performance
SIBs.
Advanced Energy Materials,
Journal Year:
2023,
Volume and Issue:
13(21)
Published: April 20, 2023
Abstract
Na
0.44
MnO
2
is
a
promising
cathode
material
for
sodium‐ion
batteries
owing
to
its
excellent
cycling
stability
and
low
cost.
However,
insufficient
sodium
storage
sites
still
hinder
practical
applications.
Herein,
facile
strategy
induce
the
efficient
structural
transformation
from
tunnel
layered
type
of
by
trace
W‐doping
first
time
reported.
The
not
only
enriches
but
also
improves
performance.
As
result,
phase‐pure
P2‐Na
Mn
0.99
W
0.01
O
demonstrates
an
enhanced
reversible
specific
capacity
195.5
mAh
g
−1
energy
density
517
Wh
kg
at
0.1
C,
accompanying
superior
with
retention
80%
over
200
cycles.
Moreover,
W‐doped
samples
show
high
structure
in
moist
atmosphere
can
maintain
original
electrochemical
performance
after
water
treatment.
In
situ
ex
characterizations
reveal
electrodes.
This
work
provides
on
engineering
transition
metal
oxides
tunnel‐to‐layered
could
shed
light
design
construction
stable
high‐capacity
materials.
Advanced Functional Materials,
Journal Year:
2023,
Volume and Issue:
33(13)
Published: Jan. 20, 2023
Abstract
Branded
with
low
cost
and
a
high
degree
of
safety,
an
ambitious
aim
substituting
lithium‐ion
batteries
in
many
fields,
sodium‐ion
have
received
fervid
attention
recent
years
after
being
dormant
for
decades.
Layered
materials
are
major
focus
study
owing
to
the
extensive
experience
already
gained
batteries,
pursuit
Mn‐rich
composition
is
critical
reduce
while
retaining
performance.
This
review
provides
timely
update
progress
layered
based
on
understandings
phase
forming
principles,
structure
transformation
upon
cycling
charge
compensation
mechanisms
discusses
potential
ambiguities
high‐performance
materials.
Advanced Functional Materials,
Journal Year:
2022,
Volume and Issue:
32(18)
Published: Jan. 27, 2022
Abstract
Lithium‐rich
manganese‐based
layered
oxides
(LROs)
are
standing
out
as
cathode
materials
of
lithium‐ion
batteries
(LIBs)
due
to
merits
on
both
capacity
(>250
mAh
g
−1
)
and
operation
voltage
(≈3.6
V).
However,
the
applications
LROs
plagued
by
almost
inevitable
degradation
structure,
in
which
electrode
surface
bears
brunt
primacy
barrier
for
Li
+
transport.
Plenty
modification
strategies
proposed
stabilize
structure
situ
self‐reconstruction
with
atomic
level
connection
bulk
structures
provide
robust
layers
prevent
degradation.
Herein,
a
critical
review
focusing
reconstruction
is
summarized.
It
started
from
overview
then
challenges
including
lattice
oxygen
release,
phase
transformation,
transition
metal
ions
dissolution,
interfacial
side
reactions
further
discussed.
In
emphasized
alleviate
performance
LROs,
creating
vacancies
synthesizing
layered‐spinel
or
layered‐rocksalt
heterogeneous
structures.
Among
these
approaches,
synthesis
characterization
methods,
formation
mechanisms
roles
highlighted.
Finally,
prospects
aspects
precise/large
scale
preparations,
interphase
design
between
electrolytes
electrodes,
in‐operando
approaches
commercialization
provided.
Energy & Environmental Science,
Journal Year:
2023,
Volume and Issue:
16(11), P. 4759 - 4811
Published: Jan. 1, 2023
This
review
comprehensively
summarizes
the
operation
fundamentals
of
SMBs
in
different
environments
and
proposes
various
targeted
optimization
strategies.
Angewandte Chemie International Edition,
Journal Year:
2023,
Volume and Issue:
62(15)
Published: Feb. 13, 2023
Manganese-rich
layered
oxide
cathodes
of
sodium-ion
batteries
(SIBs)
are
extremely
promising
for
large-scale
energy
storage
owing
to
their
high
capacities
and
cost
effectiveness,
while
the
Jahn-Teller
(J-T)
distortion
low
operating
potential
Mn
redox
largely
hinder
practical
applications.
Herein,
we
reveal
that
annealing
in
argon
rather
than
conventional
air
is
a
universal
strategy
comprehensively
upgrade
Na-storage
performance
Mn-based
cathodes.
Bulk
oxygen
vacancies
introduced
via
this
method,
leading
reduced
valence,
lowered
3d-orbital
level,
formation
new-concept
domains.
As
result,
density
model
P2-Na0.75
Mg0.25
Mn0.75
O2
cathode
increases
by
≈50
%
benefiting
from
improved
specific
capacity
redox.
The
domains
can
disrupt
cooperative
J-T
distortion,
greatly
promoting
cycling
stability.
This
exciting
finding
opens
new
avenue
towards
high-performance
SIBs.
