Abstract
Polyvinylidene
fluoride
(PVDF)
has
unique
electrochemical
oxidation
resistance
and
is
the
only
binder
for
high‐voltage
cathode
materials
in
battery
industry
a
long
time.
However,
PVDF
still
some
drawbacks,
such
as
environmental
limitations
on
fluorine,
strict
requirements
humidity,
weak
adhesion,
poor
lithium
ion
conductivity.
Herein,
long‐standing
issues
associated
with
cobalt
oxide
(LiCoO
2
;
LCO)
are
successfully
addressed
by
incorporating
phenolphthalein
polyetherketone
(PEK‐C)
polyethersulfone
(PES‐C)
materials.
These
binders
have
unexpected
robustness
ensure
uniform
coverage
surface
of
LCO,
establish
an
effective
fast
ion‐conductive
CEI/binder
composite
layer.
By
leveraging
these
favorable
characteristics,
electrodes
based
polyarylether
demonstrate
significantly
better
cycling
rate
performance
than
their
counterparts
using
traditional
binders.
The
layer
effectively
mitigates
adverse
reactions
at
cathode–electrolyte
interface.
As
anticipated,
batteries
utilizing
exhibit
capacity
retention
rates
88.92%
80.4%
after
200
500
cycles
4.5
4.6
V,
respectively.
application
binders,
offers
straightforward
inspiring
approach
designing
high‐energy‐density
Advanced Energy Materials,
Год журнала:
2023,
Номер
13(35)
Опубликована: Июль 30, 2023
Abstract
Lithium
bis(oxalate)borate
(LiBOB)
is
one
of
the
most
common
film‐forming
electrolyte
additives
used
in
lithium
ion
batteries
(LIBs),
since
it
can
form
a
dense
boron‐containing
polymer
as
solid
interlayer
(or
cathode
interlayer)
order
to
isolate
electrode
material
from
and
prevent
side
reactions.
LiBOB
serve
HF
scavenger
maintain
structural
integrity
electrodes
via
avoiding
transition
metal
dissolution
caused
by
attack.
also
react
with
LiPF
6
generate
difluoro
(oxalate)borate
(LiDFOB)
that
be
further
clean‐up
agent
for
reactive
oxygen
radicals.
This
article
lists
application
high
capacity
voltage
materials,
reviews
working
mechanisms
these
materials
improve
performance
LIBs.
Finally,
presents
current
shortcomings
strategies
overcome
these.
expected
provide
useful
insights
employing
feasible
method
dealing
difficulty
running
LIBs
stably
under
voltage.
Advanced Materials,
Год журнала:
2024,
Номер
36(24)
Опубликована: Март 4, 2024
Abstract
Lithium‐rich
manganese‐based
layered
oxides
(LRMOs)
are
promisingly
used
in
high‐energy
lithium
metal
pouch
cells
due
to
high
specific
capacity/working
voltage.
However,
the
interfacial
stability
of
LRMOs
remains
challenging.
To
address
this
question,
a
novel
armor‐like
cathode
electrolyte
interphase
(CEI)
model
is
proposed
for
stabilizing
LRMO
at
4.9
V
by
exploring
partially
fluorinated
formulation.
The
fluoroethylene
carbonate
(FEC)
and
tris
(trimethylsilyl)
borate
(TMSB)
formulated
largely
contribute
formation
CEI
with
LiB
x
O
y
Li
PO
F
z
outer
layer
LiF‐
3
4
‐rich
inner
part.
Such
effectively
inhibits
lattice
oxygen
loss
facilitates
+
migration
smoothly
guaranteeing
deliver
superior
cycling
rate
performance.
As
expected,
Li||LRMO
batteries
such
achieve
capacity
retention
85.7%
average
Coulomb
efficiency
(CE)
99.64%
after
300
cycles
4.8
V/0.5
C,
even
obtain
87.4%
100
higher
cut‐off
voltage
V.
Meanwhile,
9
Ah‐class
show
over
thirty‐eight
stable
life
energy
density
576
Wh
kg
−1
Advanced Functional Materials,
Год журнала:
2024,
Номер
unknown
Опубликована: Июнь 4, 2024
Abstract
Sodium
metal
batteries
(SMBs)
remain
greatly
challenging
in
safety
and
stability.
Herein,
a
flame‐retardant
s
designed,
self‐purging
high‐voltage
electrolyte
is
designed
to
stabilize
SMBs
with
the
use
of
ethoxy
(pentafluoro)
cyclotriphosphazene
(PFPN)
as
additive.
PFPN
can
participate
shell
structure
solvation
through
stronger
van
der
Waals
force
form
Na
3
N,
NaF‐rich
solid/cathode
interphase
(SEI/CEI)
electronic
insulation
fast
ion
transport.
Moreover,
harmful
impurity
(PF
5
)
also
be
scavenged
by
avoid
HF
production,
which
helps
electrode
interface.
Additionally,
combustion
radicals
(H,
HO)
cleared
between
radical
(RPO)
formed
breaking
for
flame‐retardation
purpose.
As
expected,
Na||Na
V
2
(PO
4
O
F
battery
modified
deliver
reservation
92.4%,
CE
99.71%
after
2000
cycles,
simultaneously
possess
excellent
high‐rate
charging/slow
discharging
performance.
Angewandte Chemie International Edition,
Год журнала:
2023,
Номер
63(7)
Опубликована: Дек. 12, 2023
Abstract
The
development
of
high‐energy‐density
Li||LiCoO
2
batteries
is
severely
limited
by
the
instability
cathode
electrolyte
interphase
(CEI)
at
high
voltage
and
temperature.
Here
we
propose
a
mechanically
thermally
stable
CEI
designing
for
achieving
exceptional
performance
4.6
V
70
°C.
2,4,6‐tris(3,4,5‐trifluorophenyl)boroxin
(TTFPB)
as
additive
could
preferentially
enter
into
first
shell
structure
PF
6
−
solvation
be
decomposed
on
LiCoO
surface
low
oxidation
potential
to
generate
LiB
x
O
y
‐rich/LiF‐rich
CEI.
layer
effectively
maintained
integrity
provided
excellent
mechanical
thermal
stability
while
abundant
LiF
in
further
improved
homogeneity
Such
drastically
alleviated
crack
regeneration
irreversible
phase
transformation
cathode.
As
expected,
with
tailored
achieved
91.9
%
74.0
capacity
retention
after
200
150
cycles
4.7
V,
respectively.
Moreover,
such
also
delivered
an
unprecedented
high‐temperature
73.6
100
°C
V.
Advanced Energy Materials,
Год журнала:
2023,
Номер
14(8)
Опубликована: Дек. 15, 2023
Abstract
As
the
pursuit
of
greater
energy
density
for
portable
battery
has
stimulated
exhaustive
research
in
high‐voltage
lithium‐ion
batteries
(LIBs),
developing
electrolyte
additives
is
considered
a
cost‐efficient
way
to
improve
performance
battery.
Here,
three
interactional
issues
LiCoO
2
(LCO)
commercial
electrolytes
at
high
voltage
are
summarized,
this
review
first
identifies
an
unavoidable
vicious
cycle
voltage.
LCO/electrolyte
interphase
break,
dissolution
transition
metal
(TM)
ions,
and
formation
harmful
HF
accelerate
failing
progress
voltage,
besides
malfunction
anode
happens
same
time
because
electrode
crosstalk.
Then,
modification
summarized
according
solutions
cycle.
Last,
framework
future
on
LCO
outlined.
Advanced Energy Materials,
Год журнала:
2024,
Номер
14(21)
Опубликована: Фев. 29, 2024
Abstract
Lithium
metal
batteries,
which
are
constructed
by
lithium‐rich
manganese‐based
oxide
(LRMO)
cathode
and
Li
anode,
have
attracted
intensive
attention
due
to
its
high
energy
density.
However,
the
instability
of
both
anode
limits
practical
application
undesirable
electrolyte
decomposition
at
voltage.
To
address
these
issues,
an
engineering
strategy
is
proposed
for
constructing
robust,
highly
+
‐conductive
solid
interphases
on
with
chlorobenzene
as
additive.
Due
mechanical
stability
interface
dynamics
LiCl‐endorsed,
LiF‐rich
interphase,
transition
ion
dissolution
effectively
inhibited.
Meanwhile,
robust
LiF/LiCl‐rich
interphase
can
repress
overgrowth
dendrites.
The
Li||LRMO
battery
optimized
2.0
wt.%
demonstrates
a
high‐capacity
retention
86.1%
after
200
cycles
0.5
C.
Advanced Energy Materials,
Год журнала:
2024,
Номер
14(11)
Опубликована: Фев. 5, 2024
Abstract
Various
electrolyte
additives
are
developed
to
construct
a
cathode
interphase
(CEI)
layer
for
high‐voltage
LiCoO
2
since
the
suffers
severe
interfacial
degradation
when
increasing
cut‐off
voltage
over
4.55
V.
However,
CEI
derived
from
additive
sacrificial
reaction
faces
risk
of
rupture
due
corrosion
and
volumetric
variation
cathode.
Herein,
non‐passivating
interface
is
realized
4.6
V
with
non‐sacrificial
(TBAClO
4
)
by
regulating
solvent
environment
at
rather
than
preferential
decomposition
formation.
Owing
novel
protection
mechanism,
cell
performance
shows
little
dependence
on
CEI‐formation
process.
Therefore,
an
ultra‐high
initial
coulombic
efficiency
(96.63%)
excellent
cycling
stability
(81%
capacity
retention
after
300
cycles)
achieved
in
Li||LiCoO
batteries.
Moreover,
even
containing
1000
ppm
H
O,
remarkable
water
capture
ability
together
its
regulation
enables
battery
retain
80%
200
cycles.
This
strategy
provides
new
insights
into
design
high‐energy‐density
lithium
metal
