Lithium‐rich
manganese‐based
(LRM)
cathode
materials
have
recently
gained
increasing
attention
for
their
remarkable
reversible
capacity
of
up
to
378
mAh
g
−1
.
However,
the
development
these
is
hindered
by
several
challenges,
including
oxygen
deficiency,
migration
transition
metal
ions,
and
structural
changes
from
lamellar
spinel
phases.
As
a
result,
limitations
result
in
low
initial
Coulomb
efficiency,
capacity/voltage
decay,
inadequate
cycle
life.
To
address
issues,
modification
layered
lithium‐rich
proves
be
an
effective
approach.
In
this
review,
structure
electrochemical
properties
LRM
are
introduced
various
systematic
strategies
discussed.
Herein,
current
state
future
prospects
such
as
doping,
surface
coating,
control
delved
into.
Furthermore,
ideas
achieving
high‐capacity
long‐cycle‐layered
presented.
Advanced Functional Materials,
Год журнала:
2025,
Номер
unknown
Опубликована: Фев. 21, 2025
Abstract
Li‐rich
Mn‐based
(LRM)
cathode
materials
are
considered
promising
candidates
for
next‐generation
lithium‐ion
batteries
due
to
their
high
specific
capacity
and
cost‐effectiveness.
However,
they
exhibit
deficiencies
in
volumetric
energy
density,
largely
attributable
lower
compaction
which
constrains
application
space‐limited
devices
such
as
electric
vehicles
portable
devices.
In
this
study,
(NH
4
)
2
S
O
8
surface
treatment
is
proposed
enhance
the
density
stability
performance
of
LRM
materials.
This
induces
formation
Li/O
vacancies
spinel
structure,
leading
an
increase
initial
Coulombic
efficiency
(ICE)
from
75.62%
89.07%,
well
discharge
214.2
266.01
mAh
g
−1
compared
with
untreated
sample.
Furthermore,
self‐grading
generated
by
crushing
particles
during
process,
results
enhancement
3.18
cm
−3
3145
Wh
L
,
significantly
surpassing
2487
commercial
The
present
work
provides
new
perspectives
development
density.
ACS Sustainable Chemistry & Engineering,
Год журнала:
2024,
Номер
12(18), С. 7012 - 7025
Опубликована: Апрель 24, 2024
All-solid-state
batteries
(ASSBs)
employing
inorganic
solid
electrolytes
have
been
considered
as
promising
candidates
for
next
generation
energy
storage
owing
to
their
intrinsic
safety
performance
and
high
density.
Designing
highly
ionically
conductive
(electro)chemically
stable
utilizing
cost-effective
materials
is
of
vital
importance
the
development
practical
ASSBs.
Herein,
we
report
a
series
new
lithium-conducting
superionic
halides
Li2+xHf1–xFexCl6
that
are
free
rare-earth
elements
with
ionic
conductivities
up
0.91
mS
cm–1
at
30
°C
by
aliovalent
substitution
low-cost
earth-abundant
Fe
elements.
By
means
complementary
characterization
techniques
bond-valence
site
(BVSE)
calculations,
gain
insights
into
influence
doping
engineering
on
local
structural
environment
underlying
lithium-ion
transport
properties
Fe3+-substituted
Li2HfCl6.
Importantly,
it
demonstrated
prevalently
existent
distortion
octahedral
structure
redistribution
lithium
ion
induced
strongly
benefits
properties.
Notably,
formation
infinitely
3D
connected
migration
pathways
comprised
directly
face-sharing
octahedron
along
c
direction
revealed
analysis
theoretical
calculations.
Additionally,
oxidation
tolerance
Li2HfCl6,
fabricated
bulk-type
ASSBs
uncoated
LiCoO2
deliver
an
outstanding
electrochemical
performance.
Lithium-rich
manganese-based
layered
oxide
cathode
materials
(LLOs)
have
always
been
considered
as
the
most
promising
for
achieving
high
energy
density
lithium-ion
batteries
(LIBs).
However,
in
practical
applications,
LLOs
often
face
some
key
problems,
such
low
initial
coulombic
efficiency,
capacity/voltage
decay,
poor
rate
performance
and
cycle
stability.
It
seriously
shortens
lifespan
of
hinder
large-scale
commercial
application
LLOs.
Herein,
firstly,
basic
theories
were
systematically
reviewed,
including
structural
characteristics,
working
mechanism
LLOs,
preparation
methods
(liquid
phase
co-precipitate
method,
sol-gel
hydrothermal
synthesis
solid
heat
solid-phase
temperature
solid-state
method
etc.),
electrochemical
characteristics
(first
charge
discharge
reversible
cycling
performance,
thermal
stability
etc.).
Then,
challenges
faced
by
discussed.
Finally,
modification
strategies
used
to
address
these
(element
doping,
surface
modification,
defect
engineering,
morphological
control
etc.)
elaborated
detail.
This
important
review
provides
potential
insights
directions
further
improving
a
necessary
theoretical
basis
accelerating
possesses
scientific
research
value
far-reaching
social
significance.
Energy & Fuels,
Год журнала:
2023,
Номер
37(23), С. 18243 - 18265
Опубликована: Ноя. 27, 2023
Lithium-rich
manganese-based
cathode
materials
are
considered
the
most
attractive
for
next-generation
lithium-ion
batteries
due
to
their
high
energy
density
and
unique
electrochemical
behavior.
However,
release
of
oxygen
during
charging
discharging,
irreversible
structure
transformation,
severe
side
reactions
lithium-rich
have
seriously
hindered
industrial
applications.
Based
on
research
results
Li-rich
in
recent
years,
this
Review
highlights
progress
terms
structure,
discharging
mechanism,
as
well
current
key
problems
such
capacity
degradation,
poor
rate
performance,
serious
voltage
decay,
low
initial
Coulombic
efficiency,
defects
process,
etc.;
it
also
summarizes
specific
modification
strategies
above
problems,
structural
design,
single-element
doping
or
codoping,
coating,
electrolyte
additives,
so
on.
This
future
development
trends
commercial
prospects
materials,
hoping
provide
new
ideas
insights
advancement
which
will
contribute
industrialization
materials.
