Angewandte Chemie,
Год журнала:
2024,
Номер
unknown
Опубликована: Ноя. 8, 2024
Abstract
The
spin
state
of
transition‐metal
compounds
in
lithium‐sulfur
batteries
(LSBs)
significantly
impacts
the
electronic
properties
and
kinetics
sulfur
redox
reactions
(SRR).
However,
accurately
designing
remains
challenging,
which
is
crucial
for
understanding
structure‐performance
relationship
developing
high‐performance
electrocatalysts.
Herein,
CoF
2
,
specifically
Co
2+
with
3
d
7
electrons
a
high‐spin
distribution
(t
2g
5
e
g
),
were
tailored
predictably
first
time
through
weak
coordination
field
effect
F
element.
Both
DFT
calculations
experimental
results
confirm
that
transitions
from
low‐
to
configurations
strongly
interacts
species
Co−S
Li−F
bonds
during
SRR
process.
This
interaction
weakens
S−S
bond,
promoting
its
facile
cleavage
both
ends
while
also
facilitating
rapid
uniform
nucleation
Li
S
/Li
S,
thus
resulting
LSBs
capacity
447.7
mAh
−1
at
10
C
rates
stable
cycling
1000
cycles,
an
acceptable
practical
585
high
loading
mass
mg
cm
−2
.
work
achieves
rational
control
active
electron
enriches
application
accelerate
LSBs.
Advanced Functional Materials,
Год журнала:
2025,
Номер
unknown
Опубликована: Май 28, 2025
Abstract
Alkali
metal
chalcogen
batteries
(such
as
lithium–sulfur/selenium,
sodium–sulfur
systems,
abbreviated
Li‐S/Se
and
Na‐S)
have
become
an
important
direction
for
the
next
generation
of
high‐energy
due
to
their
ultra‐high
theoretical
energy
density
cost
advantages,
but
problem
rapid
capacity
decay
needs
be
solved
urgently.
Covalent
organic
frameworks
(COFs)
provide
a
new
idea
improving
battery
performance
high
specific
surface
area
tunable
structure:
porous
structure
can
sufficient
electrochemical
reaction
sites
optimize
ion
transport
paths,
thereby
charge‐discharge
efficiency
rate
performance.
In
this
paper,
research
progress
COFs
in
alkali
is
systematically
reviewed.
Angewandte Chemie,
Год журнала:
2024,
Номер
unknown
Опубликована: Ноя. 8, 2024
Abstract
The
spin
state
of
transition‐metal
compounds
in
lithium‐sulfur
batteries
(LSBs)
significantly
impacts
the
electronic
properties
and
kinetics
sulfur
redox
reactions
(SRR).
However,
accurately
designing
remains
challenging,
which
is
crucial
for
understanding
structure‐performance
relationship
developing
high‐performance
electrocatalysts.
Herein,
CoF
2
,
specifically
Co
2+
with
3
d
7
electrons
a
high‐spin
distribution
(t
2g
5
e
g
),
were
tailored
predictably
first
time
through
weak
coordination
field
effect
F
element.
Both
DFT
calculations
experimental
results
confirm
that
transitions
from
low‐
to
configurations
strongly
interacts
species
Co−S
Li−F
bonds
during
SRR
process.
This
interaction
weakens
S−S
bond,
promoting
its
facile
cleavage
both
ends
while
also
facilitating
rapid
uniform
nucleation
Li
S
/Li
S,
thus
resulting
LSBs
capacity
447.7
mAh
−1
at
10
C
rates
stable
cycling
1000
cycles,
an
acceptable
practical
585
high
loading
mass
mg
cm
−2
.
work
achieves
rational
control
active
electron
enriches
application
accelerate
LSBs.
