Abstract
A
series
of
cathode
materials,
Li[Ni
0.6
Co
0.12
Mn
0.2
Fe
0.08
]
1‐x
Cr
x
O
2
(x=0,
0.02,
0.04,
0.06),
are
synthesized
via
the
co‐precipitation
method.
Structural
characterization
shows
that
3+
ions
successfully
incorporated
into
material
structure
and
evenly
dispersed
on
surface
crystal
particles
with
other
metal
elements.
The
Cr‐doped
a
well‐defined
hexagonal
layered
less
cation
mixing,
increase
in
interionic
interlayer
distances
is
beneficial
for
transport
lithium
ions.
Compared
to
pure
NCMFe
phase,
cyclic
rate
performances
quaternary
materials
have
been
significantly
improved.
Among
them,
4Cr
exhibits
best
electrochemical
performance.
capacity
retention
after
50
charge‐discharge
cycles
at
0.1
C
was
increased
from
74.83
%
87.32
%.
performance
has
also
87.6
92.69
can
reduce
charge
transfer
resistance
enhance
stability
structure,
which
results
outstanding
cathode.
CV
EIS
tests
were
conducted
various
doping
levels,
further
confirming
degree
polarization
electrode
discharge
reversibility,
materials.
Advanced Functional Materials,
Год журнала:
2024,
Номер
unknown
Опубликована: Ноя. 3, 2024
Abstract
Triboelectric
nanogenerator
(TENG)
offers
a
novel
approach
for
converting
high‐entropy
mechanical
energy
into
electrical
energy,
yet
achieving
high
charge
density
remains
critical.
Optimizations
using
dielectrics
with
specific
capacitance
have
mitigated
air
breakdown,
but
loss
within
persists
as
limiting
factor.
Here,
based
on
poly(vinylidene
fluoride–trifluoroethylene–chlorofluoroethylene)
(P(VDF‐TrFE‐CFE))
capacitance,
composites’
trap
and
are
engineered
high‐polarity
interfaces
from
barium
titanate
(BTO)
nanoparticles
dense
chain
segment
stacking
induced
by
electrostatic
interaction
polyetherimide
(PEI)
to
enhance
retention
capability.
With
modified
interfacial
traps,
an
ultrahigh
of
9.23
mC
m
−2
is
achieved
in
external
excitation
(ECE)
TENG
0.2
vol%
PEI/P(VDF‐TrFE‐CFE)
film,
marking
the
highest
reported
single‐unit
TENGs.
This
work
provides
material
strategies
high‐performance
TENGs,
paving
way
their
large‐scale
practical
applications.
Nanoenergy Advances,
Год журнала:
2025,
Номер
5(1), С. 1 - 1
Опубликована: Янв. 14, 2025
Understanding
the
mechanism
underlying
triboelectrification
(TE)
in
polymers
is
crucial
for
developing
cheap
and
effective
triboelectric
nanogenerators.
Finding
out
how
a
polymer
becomes
tribopositive
especially
relevant,
as
most
tend
to
charge
negatively,
reducing
power
output
range
of
applications.
Thus
far,
it
has
remained
unclear
whether
TE
be
attributed
homolytic
ion
transfer,
heterolytic
material
or
electronic
transfer.
Investigating
polyoxymethylene
by
first-principle
investigations,
this
study
reveals
novel
pathway
driven
bond
rupture.
Our
demonstrates
that
cleavage
C–H
upon
contact
with
metal
surface
drives
rearrangement
oxidation
state
carbon
atom,
leading
its
dangling
cede
an
electron
countersurface,
significant
positive
charging
POM.
This
aligns
series
experimental
observations.
These
insights
suggest
mechanisms
can
more
complicated
than
depending
on
material-specific
composition
chemistry.
potentially
paves
way
designing
materials
tailored
properties
enhanced
nanogenerator
performance.
Abstract
A
series
of
cathode
materials,
Li[Ni
0.6
Co
0.12
Mn
0.2
Fe
0.08
]
1‐x
Cr
x
O
2
(x=0,
0.02,
0.04,
0.06),
are
synthesized
via
the
co‐precipitation
method.
Structural
characterization
shows
that
3+
ions
successfully
incorporated
into
material
structure
and
evenly
dispersed
on
surface
crystal
particles
with
other
metal
elements.
The
Cr‐doped
a
well‐defined
hexagonal
layered
less
cation
mixing,
increase
in
interionic
interlayer
distances
is
beneficial
for
transport
lithium
ions.
Compared
to
pure
NCMFe
phase,
cyclic
rate
performances
quaternary
materials
have
been
significantly
improved.
Among
them,
4Cr
exhibits
best
electrochemical
performance.
capacity
retention
after
50
charge‐discharge
cycles
at
0.1
C
was
increased
from
74.83
%
87.32
%.
performance
has
also
87.6
92.69
can
reduce
charge
transfer
resistance
enhance
stability
structure,
which
results
outstanding
cathode.
CV
EIS
tests
were
conducted
various
doping
levels,
further
confirming
degree
polarization
electrode
discharge
reversibility,
materials.
