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Lithium-ion batteries – electrolytes – solid & semi-solid
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A sulfide-based solid electrolyte with argyrodite structure was prepared through
boron-based element substitution. Precursors Li2S,
P2S5, LiCl, and LiBr were mixed with
B2S3 (1.1 mol% based on total precursor mass).
The precursors were subjected to ball-milling with 3 mm balls in heptane,
followed by vacuum drying (80°C).
The precursor powder was heat-treated (500°C, 6 h, Ar atmosphere) to form the
argyrodite-type solid electrolyte. X-ray diffraction (XRD) analysis confirms
the formation of argyrodite structure with characteristic peaks matching those
of the undoped comparative material (see Figure).
The resulting solid electrolyte exhibits an ionic conductivity of 7.34 × 10-3 S/cm
and a compressed density of 1.80 g/cm3.
Electrochemical testing with NCM811-based positive electrodes reveals a
discharge capacity of 182 mAh/g and a coulombic efficiency of 78.4%
(0.05 C charge / discharge), as compared to 169 mAh/g and 79.0% for the
undoped comparative material.
The boron substitution forms [B]S3 triangle structures within
the argyrodite crystal lattice, which strengthens the structural stability and
suppresses hydrogen sulfide gas evolution when exposed to moisture (no corresponding experimental data was identified).
실시예1: Example 1
실시예2: Example 2
실시예3: Example 3
실시예4: Example 4
비교예: Comparative example
This work suggests that B-doped sulfide electrolytes exhibit increased ionic conductivities and reduced moisture sensitivity.
Further optimization of surface characteristics could contribute to further improved moisture stability while maintaining
a favorable ionic conductivity.
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Lithium-ion batteries – negative electrode (excluding Li metal electrodes)
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Granules were prepared by mixing SiO (D50: 17 μm, 91 mass%), single-walled
carbon nanotubes (SWCNT, 1.6 mass%), polyvinylpyrrolidone dispersant (PVP, 2.4 mass%),
styrene-butadiene rubber (SBR, 2 mass%), acrylamide-acrylate copolymer
(acrylamide : acrylic acid : acrylonitrile = 60 : 30 : 10 molar ratio, 2 mass%),
and carboxymethyl cellulose (CMC, 1 mass%) in water.
The slurry was spray-dried (250°C inlet temperature, 105°C outlet temperature), followed by sieving to obtain
granules (D90: 35 μm). The granules exhibit a higher binder concentration near the surface,
while SiO and SWCNT are more highly concentrated in particle cores.
A negative electrode mixture was manufactured by mixing the granules (3.2 mass%) with
artificial graphite (46.5 mass%), natural graphite (46.5 mass%), carbon black
(1.0 mass%), polyethylene (PE, 0.3 mass%), polyvinylidene fluoride (PVDF, 2.0 mass%),
and polytetrafluoroethylene (PTFE, 0.5 mass%). The mixture was kneaded at
140°C under 50 atm pressure for 20 min at 10 rpm.
The resulting mixture lump was pulverized and calendered using rolls at 130°C
to form a negative electrode film (see Figure). Two films were laminated on both sides of
a copper current collector (12 μm) coated with a conductive primer layer
(carbon black : acrylic binder = 5 : 5 mass ratio).
In half-cells, these electrodes exhibit a capacity retention of 89.8% after 100 cycles (0.33 C charge / discharge),
as compared to 87.0% for comparative electrodes without pre-formed granules.
100: manufacturing process
110: raw materials
120: mixed powder
130: final electrode film
This work illustrates a dry negative electrode manufacturing process for which process efficiency / costs and performance
were optimized. The granular SiO-containing component is a minor negative electrode component (3.2 mass%), which reduces the cost impact
of the spray-drying step that contributes significantly to cycling stability.
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Lithium-ion batteries – positive electrode
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A precursor mixture was prepared by mixing Ni powder, Co powder,
Mn3O4 powder, Zr(OH)4 powder, and 20% excess
Li2CO3 powder in a stoichiometric ratio for
Li[Ni0.83Mn0.06Co0.11]0.9975Zr0.0025O2
(NMC83) in a high-speed mixer.
The mixed precursor was pelletized using a hydraulic press with applied
forces ranging from hand-pressed to 4 tons (19.4 MPa). The pellets were
transferred to a ceramic saggar. Sintering
was carried out at 900°C under an oxygen atmosphere in a box furnace. The
sintered materials were then jet-milled to de-agglomerate secondary particles.
In comparison trials, more agglomeration was observed for non-pelletized materials,
while pelletized samples exhibit
single-crystal morphologies with uniform particle sizes. The cation mixing values
determined from Rietveld refinement are 2.65% for non-pelletized and 1.08%
for pelletized samples.
In half-cell tests, the pelletized material exhibits a reversible discharge
capacity of 194.7 mAh/g with a first cycle irreversible capacity of
12.7%, compared to 188.6 mAh/g and 14.2% for the non-pelletized
material. After 25 cycles, the pelletized sample exhibits
≈95% capacity retention at C/5, while the non-pelletized sample exhibits
≈85% retention.
(a): non-pelletized precursor mixture
(b): pelletized precursor mixture arranged on saggar
This work illustrates promising performance upon sintering pressed NMC precursor pellets (dry process, no use of solvent),
as compared to powder sintering. Pellet sintering might offer substantial benefits in terms of process efficiency,
process consistency upon up-scaling, and sustainability.
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Fuel cells (PEMFC / SOFC / PAFC / AEMFC) – electrochemically active materials
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ELECTRODE CATALYST
Applicant:
PANASONIC /
WO 2025158822 A1
A mesoporous carbon-supported Pt1.94Co0.65Ni0.35
electrode catalyst was prepared with optimized nickel composition for enhanced
oxygen reduction reaction (ORR) activity.
Mesoporous carbon (CNovel, Toyo Carbon, pore diameter: 10 nm) was dispersed in
water / ethanol (1 : 1 mass ratio) and processed using a bead mill (20 min).
The carbon support was subjected to a water vapor adsorption treatment (30°C, 90%
relative humidity, 12 h) to enhance surface properties. A 14 mass%
dinitrodiamineplatinum nitric acid solution was added to achieve 50 mass% Pt
loading, followed by heating (80°C, 6 h) and a reduction treatment (220°C, 2 h,
nitrogen / hydrogen atmosphere 85 : 15).
Cobalt chloride hexahydrate and nickel chloride hexahydrate were dissolved in
pure water (50 mL) at predetermined ratios to achieve the target composition.
The solution was added to the Pt-supported carbon, followed by dropwise addition
of 1 mass% sodium borohydride solution (50 mL) and stirring (10 min).
Heat treatment was performed in a tube furnace under reducing atmosphere
(nitrogen / hydrogen 97 : 3, 1 L/min flow rate). Temperature profile:
heating to 120°C (10 min), ramping to 1,000°C (150°C/h), holding
(30 min), further heating to 1,100°C (100°C/h), and maintaining (2 h).
The resulting material was stirred in 0.2 mol/L sulfuric acid (80°C, 2 h) and
0.2 mol/L nitric acid (70°C, 2 h) to remove excess cobalt and nickel from the
surface. A secondary heat treatment was conducted (400°C, 2 h, hydrogen
atmosphere) for surface densification.
X-ray diffraction analysis confirms the formation of an L10 ordered
structure with a ratio of 0.44. The catalyst exhibits a mass activity of
1,420 A/g-Pt at 0.9 V, representing a 2.58-fold improvement compared to the
Pt-Co binary alloy catalyst (see Figure).
The optimized nickel composition ratio (y = 0.35) in the
PtxCo1-yNiy formula demonstrates superior
catalytic performance due to synergistic effects between the mesoporous support
and the ternary alloy composition.
● Mesoporous carbon support
□ Carbon black support (comparative examples)
規格化触媒活性: Normalized catalytic activity
ニッケルの組成比率: Nickel composition ratio
This work illustrates favorable catalytic PEMFC performance upon simultaneously optimizing the carbon support,
the Pt / Ni ratio and process characteristics that affect the catalyst nanostructure.
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Triweekly patent lists for other categories (Excel files are included for premium users)
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- Lithium metal batteries (excluding Li-S, Li-Air): XLSX
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- Lithium-air batteries: XLSX
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- Lithium-ion batteries – electrolytes – liquid: XLSX
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- Lithium-ion batteries – separators: XLSX
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- Lithium-sulfur batteries: XLSX
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- Na-ion batteries: XLSX
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Prior patent updates
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2025-08-12
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2025-07-22
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2025-07-01
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2025-06-10
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2025-05-20
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