High-entropy
sodium
vanadium
fluorophosphate
(HE-NVPF)
with
good
structural
stability,
high
electrical
conductivity,
and
rapid
redox
dynamics
has
been
considered
to
be
a
promising
cathode
material
for
sodium-ion
batteries.
However,
the
HE-NVPF
prepared
by
conventional
sol–gel
method
is
usually
challenged
time-consuming
reaction
processes
uncontrollable
particle
sizes
due
slow
mass/heat
transfer
uneven
space,
which
restrict
its
electrochemical
performance.
In
this
study,
we
developed
continuous-flow
synthesis
strategy
via
microreactor
construct
high-entropy
Na3V2–xMx(PO4)2F3
(0
<
x
2,
M
=
Ca,
Mg,
Al,
Cr,
Mn)
(M-HE-NVPF).
Notably,
transfer,
confined
doping
effect
can
realize
efficient
(2
h)
of
M-HE-NVPF
small
size
(∼131
nm),
conductivity
because
introduction
local
disturbances
leading
overlapping
energy
distributions
sites,
distinct
suppressing
detrimental
phase
transitions
in
low
plateau
region.
As
result,
exhibits
rate
capacities
125.3
mAh
g–1
at
0.5
C
110.8
50
C,
marvelous
cycle
stability
90.5%
capacity
retention
95.5%
20
after
400
cycles.
Advanced Energy Materials,
Journal Year:
2023,
Volume and Issue:
13(37)
Published: Aug. 17, 2023
Abstract
In
recent
decades,
sodium‐ion
batteries
(SIBs)
have
received
increasing
attention
because
they
offer
cost
and
safety
advantages
avoid
the
challenges
related
to
limited
lithium/cobalt/nickel
resources
environmental
pollution.
Because
sodium
storage
performance
production
of
SIBs
are
dominated
by
cathode
performance,
developing
materials
with
large‐scale
capacity
is
key
achieving
commercial
applications
SIBs.
Therefore,
host
high
energy
density,
long
cycling
life,
low
cost,
chemical/environmental
stability
crucial
for
implementing
advanced
Among
developed
SIBs,
O3‐type
sodiated
transition‐metal
oxides
attracted
extensive
owing
their
simple
synthesis
methods,
theoretical
specific
capacity,
sufficient
Na
content.
However,
relatively
large
Na‐ion
radius
leads
sluggish
diffusion
kinetics
inevitable
complex
phase
transitions
during
deintercalation/intercalation
process,
resulting
in
poor
rate
capability
stability.
this
review
comprehensively
summarizes
research
progress
modification
strategies
cathodes,
including
component
design,
surface
modification,
optimization
methods.
This
work
aims
guide
development
layered
provide
technical
support
next
generation
energy‐storage
systems.
Advanced Energy Materials,
Journal Year:
2023,
Volume and Issue:
13(36)
Published: Aug. 17, 2023
Abstract
Achieving
multi‐sodium
storage
and
high
operating
voltage
is
key
to
boosting
energy
density
of
NASICON‐type
materials.
However,
the
activation
more
redox
couples
usually
accompanied
by
asymmetric
irreversible
electrochemical
reactions,
thus
causing
fast
capacity
fading.
To
address
this
issue,
a
medium‐entropy
concept
proposed,
novel
Na
3
Mn
2/3
V
Ti
(PO
4
)
/C@CNTs
(ME‐NMVTP)
cathode
designed.
The
as‐prepared
ME‐NMVTP
achieves
successive
reaction,
delivering
highly
reversible
specific
147.9
mA
h
g
−1
at
50
together
with
long‐term
lifespan
1000
cycles
500
(capacity
retention
88.3%),
which
superior
low‐entropy
cathodes
such
as
MnV(PO
(LE‐NMVP)
MnTi(PO
(LE‐NMTP).
Moreover,
benefiting
from
entropy
effect,
solid‐solution
biphasic
reactions
structure
evolution
small
volume
change
are
achieved
during
process.
First‐principles
calculation
kinetic
analysis
results
affirm
enhanced
electronic
conductivity
facilitated
+
migration
derived
synergistic
effect
three
transition‐metal
elementals
in
crystalline
state.
strategy
engineering
construct
performance
expected
be
widely
applicable
other
electrode
Small,
Journal Year:
2023,
Volume and Issue:
19(36)
Published: May 11, 2023
Prussian
blue
analogs
(PBAs)
have
attracted
wide
interest
as
a
class
of
ideal
cathodes
for
rechargeable
sodium-ion
batteries
due
to
their
low
cost,
high
theoretical
capacity,
and
facile
synthesis.
Herein,
series
highly
crystalline
Fe-based
PBAs
(FeHCF)
cubes,
where
HCF
stands
the
hexacyanoferrate,
is
synthesized
via
one-step
pyrophosphate-assisted
co-precipitation
method.
By
applying
this
proposed
crystallization-controlled
method
slow
down
crystallization
process
suppress
defect
content
crystal
framework
PBAs,
as-prepared
materials
demonstrate
sodium-rich
induced
rhombohedral
phase.
As
result,
prepared
FeHCF
can
deliver
specific
capacity
up
152.0
mA
h
g-1
(achieving
≈90%
its
value)
an
excellent
rate
capability
with
high-capacity
retention
ratio
88%
at
10
C,
which
makes
it
one
most
competitive
candidates
among
reported
regarding
both
performance.
A
reversible
three-phase-transition
storage
mechanism
has
been
revealed
multiple
in
situ
techniques.
Furthermore,
full
cells
fabricated
cathode
commercial
hard
carbon
anode
exhibit
compatibility
shows
great
prospects
application
large-scale
energy
systems.
Advanced Energy Materials,
Journal Year:
2024,
Volume and Issue:
14(27)
Published: May 22, 2024
Abstract
Sodium‐ion
batteries
(SIBs)
are
regarded
as
next‐generation
secondary
and
complement
to
lithium‐ion
(LIBs)
for
large‐scale
electrochemical
energy
storage
applications
due
the
abundant
availability,
even
distribution,
cost‐effectiveness
of
raw
sodium
resources.
The
phosphate‐based
polyanions
stand
out
various
cathode
material
owing
their
high
operation
voltage,
stable
structure,
superior
safety,
excellent
sodium‐storage
properties.
undesirable
electric
conductivities
specific
capacities
limit
industrialization.
Herein,
a
recent
research
development
polyanion
cathodes
including
orthophosphate,
oxyphosphate,
pyrophosphate,
mixed
phosphates
is
thoroughly
reviewed.
Subsequently,
effect
modification
strategies
element
doping,
surface
coating,
morphology
control,
electrode
design
toward
high‐performance
materials
SIBs
systematically
explored.
Finally,
future
directions
based
on
performance
reversible
capacity,
density,
rate
cycling
stability,
commercial
comprehensively
concluded.
It
believed
that
current
review
will
present
instructive
perspectives
into
developing
practicable
SIBs.
Advanced Functional Materials,
Journal Year:
2024,
Volume and Issue:
34(18)
Published: Jan. 18, 2024
Abstract
The
Na
3
V
2
(PO
4
)
F
(NVPF)
cathode
material
is
usually
nano‐sized
particles
exhibiting
low
tap
density,
high
specific
surface
area,
correspondingly
volume
energy
and
cycle
stability
of
the
sodium‐ion
batteries
(SIBs).
Herein,
a
high‐temperature
shock
(HTS)
strategy
proposed
to
synthesize
NVPF
(HTS‐NVPF)
with
uniform
conducting
network
density.
During
typical
HTS
process
(heating
rate
1100
°C
s
−1
for
10
s),
precursors
rapidly
crystallize
form
large‐sized
dense
particles.
tight
connection
between
not
only
enhances
their
contact
carbon
layers,
but
also
reduces
area
that
inhibits
side
reactions
interfaces
electrolyte.
Besides,
ultrafast
synthesis
loss
amount
impurities,
which
improve
cycling
capability.
HTS‐NVPF
demonstrates
density
413.4
Wh
kg
an
ultra‐high
capacity
103.4
mAh
g
at
C
as
well
84.2%
retention
after
1000
cycles.
In
addition,
excellent
temperature
adaptability
(−45–55
°C)
remarkable
electrochemical
properties
NVPF||HC
full
cell
demonstrate
extreme
competitiveness
in
commercial
SIBs.
Therefore,
technique
considered
be
high‐efficiency
synthetize
expected
prepare
other
materials.
Materials Chemistry Frontiers,
Journal Year:
2023,
Volume and Issue:
8(3), P. 732 - 768
Published: Nov. 8, 2023
This
review
highlights
the
significant
roles
of
POMs
in
electrocatalysis
and
energy
storage,
summarizes
recent
advances
POM-based
materials
their
derivatives
water-splitting,
CO
2
RR,
NRR,
SCs,
rechargeable
batteries.
ACS Applied Materials & Interfaces,
Journal Year:
2024,
Volume and Issue:
16(29), P. 37346 - 37362
Published: June 26, 2024
In
recent
years,
sodium
ion
batteries
(SIBs)
emerged
as
promising
alternative
candidates
for
lithium
(LIBs)
due
to
the
high
abundance
and
low
cost
of
resources.
However,
their
commercialization
has
been
hindered
by
inherent
limitations,
such
energy
density
poor
cycling
stability.
To
address
these
issues,
doping
methodology
is
one
most
approaches
boosting
structural
electrochemical
properties
SIB
electrodes.
This
review
provides
a
comprehensive
overview
advancements
in
strategies,
focusing
on
improvement
performance
SIBs.
Various
dopants
including
s-
p-block
elements,
transition
metals,
oxides,
carbonaceous
materials,
many
more
are
discussed
terms
effects
enhancing
Furthermore,
mechanisms
responsible
doped
SIBs
materials
also
discussed.
It
highlights
importance
sites
crystal
lattice,
which
play
crucial
role
optimizing
electrode
structure,
diffusion
kinetics,
stabilizing
electrode/electrolyte
interfaces.
The
ends
looking
at
studies
simultaneous
multiple
heteroatom
doping,
offering
valuable
perspectives
SIB.
study
insight
into
researchers
battery
industries
striving
storage
technologies.
