Energy Technology,
Год журнала:
2024,
Номер
unknown
Опубликована: Дек. 14, 2024
Aimed
at
the
application
drawbacks
of
lithium‐polysulfide
semiflow
battery
involved
with
low
utilization
active
material
and
inevitable
shuttle
effect,
a
self‐supporting
porous
substrate
characterized
by
high
porosity
outstanding
conductivity
is
developed
in
this
study,
which
consists
cotton‐derived
nanofiber
graphene
wrapped
on
nanofiber.
Then
gelable
polymer
poly‐(vinylidenefluoride‐hexafluoropropylene)
further
integrated
into
for
fabricating
novel
PS
gel
cathode.
The
as‐prepared
composite
matrix
possesses
strong
adsorption/loading
ability
gelation
as
well
favorable
electron/ion
transport
pathway,
not
only
provides
effective
restriction
toward
migration
shuttle,
but
also
actualizes
rapid
redox
conversion
localized
species.
Consequently,
resultant
cathode
demonstrates
reversible
capacity,
excellent
cycle
rate
capability
even
sulfur
loading
up
to
9.0
mg
cm
−2
.
Abstract
Lithium‐ion
batteries
are
dominating
high‐energy‐density
energy
storage
for
30
years.
However,
their
development
approaches
theoretical
limits,
spurring
the
of
lithium–sulfur
cells
that
achieve
high
densities
through
reversible
electrochemical
conversion
reactions.
Nevertheless,
commercialization
is
hindered
by
practical
challenges
associated
primarily
with
use
thick‐lithium
anodes,
low‐loading
sulfur
cathodes,
and
electrolyte‐to‐sulfur
ratios,
which
prevent
realization
cells’
full
potential
in
terms
material
performance.
To
solve
these
extrinsic
intrinsic
problems,
effect
lithium‐metal
thickness
on
behavior
high‐loading
cathodes
lean‐electrolyte
configurations
investigated.
Specifically,
lithium
lanthanum
titanate
(LLTO),
a
solid
electrolyte,
utilized
to
form
an
ionically/electronically
conductive
coating
stabilize
thereby
enhancing
lithium‐ion
pathways
interfacial
charge
transfer.
Electrochemical
analyses
reveal
LLTO
significantly
reduces
excessive
reactions
between
metal
minimizing
consumption
electrolyte
depletion.
Further,
LLTO‐stabilized
anodes
improve
cell
performance,
most
importantly,
allow
fabrication
thin‐lithium,
high‐loading‐sulfur
open
pathway
toward
batteries.
