Angewandte Chemie,
Год журнала:
2025,
Номер
unknown
Опубликована: Фев. 1, 2025
Abstract
Li‐
and
Mn‐rich
layered
oxides
exhibit
high
specific
capacity
due
to
the
cationic
anionic
reaction
process
during
high‐voltage
cycling
(≥4.6
V).
However,
they
face
challenges
such
as
low
initial
coulombic
efficiency
(~70
%)
poor
stability.
Here,
we
propose
a
combination
of
H
3
BO
treatment
temperature
calcination
construct
shell
with
vacancy
on
surface
Li
1.2
Ni
0.2
Mn
0.6
O
2
(LLNMO).
The
produces
lattice
distortion,
forming
an
oxidized
n
−
(0<
<2)
surface,
accompanied
by
electrons
redistribution.
Low
eliminates
activates
metastable
promotes
coherent
formation.
In
addition,
reduces
diffusion
energy
barrier
+
,
allowing
more
oxygen
participate
in
deeper
reactions
increasing
oxidation
depth
oxygen.
modified
material
(LLNMO‐H10‐200)
exhibits
up
88
%
256
mAh
g
−1
.
Moreover,
similar
enhancements
were
observed
Co‐containing
lithium‐rich
materials,
280
discharge
89
efficiency.
These
findings
reveal
correlation
between
vacancy,
activation
bulk
phase
activity,
offering
novel
approach
enhancing
cycle
stability
Li‐rich
materials.
In
order
to
satisfy
the
rapidly
increasing
demands
for
a
large
variety
of
applications,
there
has
been
strong
desire
low-cost
and
high-energy
lithium-ion
batteries
thus
next-generation
cathode
materials
having
low
cost
yet
high
capacity.
this
regard,
research
cobalt
(Co)-free
nickel
(Ni)-rich
(CFNR)
layered
oxide
materials,
able
meet
high-capacity
requirements,
extensively
pursued
but
remains
challenging
largely
due
elimination
Co
content
Ni
in
these
materials.
Herein,
we
systematically
review
challenges
recent
advances
CFNR
on
important
aspects.
Specifically,
first
clarify
role
Ni-rich
oxides
possibility
its
fabricate
We
then
discuss
methods
developed
synthesize
This
is
followed
by
elucidation
about
their
degradation
mechanisms
progress
modification
strategies
achieved
enhancing
properties
Finally,
current
future
prospects
as
batteries.
Abstract
Reducing
our
carbon
footprint
is
one
of
the
most
pressing
issues
facing
humanity
today.
The
technology
Li‐rechargeable
batteries
permeating
every
corner
lives
as
a
result
efforts
to
reduce
use
energy.
Batteries
can
be
seen
metaphorically
“living
cells”,
and
approaching
future
that
requires
observing
understanding
real‐time
phenomena
occur
inside
battery
systems
during
(electro)chemical
reactions.
In
this
regard,
in
situ
analysis
techniques
have
made
significant
progress
toward
basic
science
finding
better
performance‐improving
factors.
There
are
various
methods
utilizing
electromagnetic
waves,
electrons,
neutrons
perform
multifaceted
analyses
from
atomic
macroscopic
scale.
Now
opportune
moment
construct
comprehensive
guide
facilitates
design
advanced
systems,
adopting
highly
discerning
all‐encompassing
approach
these
cutting‐edge
technologies.
review
article,
we
discuss
organize
key
components
such
capabilities,
limitations,
practical
tips
with
perspective
on
techniques.
Moreover,
article
covers
wide
range
information
nano
micrometer
scale,
electronic,
atomic,
crystal,
morphological
structures,
stereoscopic
perspectives
considering
probing
depth.
ACS Applied Materials & Interfaces,
Год журнала:
2023,
Номер
unknown
Опубликована: Ноя. 29, 2023
Manganese
(Mn)-based
layer-structured
transition
metal
oxides
are
considered
as
excellent
cathode
materials
for
potassium
ion
batteries
(KIBs)
owing
to
their
low
theoretical
cost
and
high
voltage
plateau.
The
energy
density
cycling
lifetime,
however,
cannot
simultaneously
satisfy
the
basic
requirements
of
market
storage
systems.
One
primary
causes
results
from
complex
structural
transformation
migration
during
intercalation
deintercalation
process.
orbital
electronic
structure
octahedral
center
element
plays
an
important
role
maintaining
integrity
improving
K+
diffusivity
by
introduced
heterogeneous
[Me-O]
chemical
bonding.
A
multitransition
oxide,
P3-type
K0.5Mn0.85Co0.05Fe0.05Al0.05O2
(KMCFAO),
was
synthesized
employed
a
material
KIBs.
Beneficial
larger
layer
spacing
better
accommodate
effectively
preventing
irreversible
in
insertion/extraction
process,
it
can
reach
superior
capacity
retention
up
96.8%
after
300
cycles
at
current
500
mA
g-1.
full
cell
KMCFAO//hard
carbon
exhibits
encouraging
promising
113.8
W
h
kg-1
100
g-1
72.6%
cycles.
Angewandte Chemie,
Год журнала:
2025,
Номер
unknown
Опубликована: Фев. 1, 2025
Abstract
Li‐
and
Mn‐rich
layered
oxides
exhibit
high
specific
capacity
due
to
the
cationic
anionic
reaction
process
during
high‐voltage
cycling
(≥4.6
V).
However,
they
face
challenges
such
as
low
initial
coulombic
efficiency
(~70
%)
poor
stability.
Here,
we
propose
a
combination
of
H
3
BO
treatment
temperature
calcination
construct
shell
with
vacancy
on
surface
Li
1.2
Ni
0.2
Mn
0.6
O
2
(LLNMO).
The
produces
lattice
distortion,
forming
an
oxidized
n
−
(0<
<2)
surface,
accompanied
by
electrons
redistribution.
Low
eliminates
activates
metastable
promotes
coherent
formation.
In
addition,
reduces
diffusion
energy
barrier
+
,
allowing
more
oxygen
participate
in
deeper
reactions
increasing
oxidation
depth
oxygen.
modified
material
(LLNMO‐H10‐200)
exhibits
up
88
%
256
mAh
g
−1
.
Moreover,
similar
enhancements
were
observed
Co‐containing
lithium‐rich
materials,
280
discharge
89
efficiency.
These
findings
reveal
correlation
between
vacancy,
activation
bulk
phase
activity,
offering
novel
approach
enhancing
cycle
stability
Li‐rich
materials.
