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Triweekly Patent Update – 2024-03-05 – Free Version

  • Chapters on Amprius, Posco and Sila Nanotechnologies have been delivered to premium users (category: anodes). Get a quote.
  • Lithium-ion batteries – electrolytes – solid & semi-solid

  • Secondary battery electrodes and secondary batteries
    Applicant: Toyota Motor / JP 2024011890 A

    N-methyl-N-butylpyrrolidinium ∙ CB9H10, LiCB9H10 and LiCB11H12 (molar ratio 2 : 4 : 4) were heated until a melt was obtained that was subsequently mixed (6 h, temperature not disclosed), followed by rapid cooling.
    Negative electrode formulation: Si / electrolyte described above / Li2S ∙ P2S5 / VGCF (vapor-grown carbon fibers) = 46 : 18.4 : 27.6 : 8 (by volume).
    Positive electrode formulation: NMC111 / Li2S ∙ P2S5 / VGCF (ratio not disclosed).
    Solid electrolyte layer formulation: Li2S ∙ P2S5.
    Through dry molding in a cylinder, cells were fabricated, which were tested with a 0.2 Nm and a 2 Nm constraint. A discharge capacity ratio of ≈99% was observed, as compared to ≈91% for comparative cells with negative electrodes based solely on sulfide electrolyte.
    This favorable effect is explained by the higher mechanical flexibility of carborane-based electrolytes as compared to sulfide electrolytes.

    This work illustrates how the novel class of carborane-based solid electrolytes enable operation of sulfide-based cells at reduced pressure, probably because of a well-rounded combination of mechanical flexibility, ion conductivity and electrochemical stability near 0 V vs. Li+/Li.

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  • Lithium-ion batteries – positive electrode

  • Lithium iron manganese phosphate material and preparation method thereof, positive electrode sheet and secondary battery
    Applicant: Shenzhen Dynanonic / Foshan Dynanonic Technology / CN 117566713 A

    Lithium iron manganese phosphate was prepared by mixing lithium carbonate, ferrous sulfate, manganese carbonate, monoammonium phosphate, and ascorbic acid in a PTFE hydrothermal kettle with oleylamine. After stirring to form an emulsion, the mixture was stirred at 150°C for 10 h, followed by centrifugation and washing with ethanol.
    The precipitate was dried (80°C, 12 h), followed by a heat treatment (700°C, nitrogen atmosphere, 8 h).
    As shown in the TEM (transmission electron microscopy) image below, well-dispersed nanoparticles with a narrow particle size distribution were obtained (5-15 nm), coated with carbon, which exhibit favorable electrochemical characteristics according to the voltage diagram as shown in the Figure below (实施例1: example 1).

    Patent Image 1, Dynanonic
    Patent Image 2, Dynanonic

    This work illustrates an approach to produce LMFP nanoparticles that likely can be upscaled with attractive raw material and process costs.
    The favorable capacity at 4 V vs. Li+/Li suggests that a Mn / Fe ratio of 7 : 3 or higher might have been used, although the specific ratio was not disclosed.

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  • Lithium-ion batteries – negative electrode (excluding Li metal electrodes)

  • Negative electrode material and preparation method thereof, battery
    Applicant: BTR New Materials Group / CN 117525427 A

    A porous carbon substrate with 2-100 nm apertures was placed in a CVD (chemical vapor deposition) chamber, purged with nitrogen. Argon gas was introduced before heating to 500°C. Silane gas was added to form a composite material.
    Sodium oxide (0.06 mass%) and magnesium oxide (0.03 mass%) were mixed with the composite material and sintered (600°C, 5 h, box furnace), followed by CVD coating with carbon (ethylene / argon, 600°C, 10 Torr, 30 min).
    In half-cell tests, the material exhibits a discharge capacity of 1,695 mAh/g, a first cycle efficiency of 89.8%, and a capacity retention after 100 cycles of 92.1% (C-rate not identified).

    Although no direct comparative data is shown for a Na- & Mg-free material, this work suggests that the simultaneous presence of sodium oxide and magnesium oxide between a Si-carbon composite material and its carbon surface coating leads to improved capacity retention.

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  • Fuel cells (PEMFC / SOFC / PAFC / AEMFC) – electrochemically active materials


    Catalytically active Pt0.40Cu0.20Mo0.40 nanoparticles as shown in the SEM image below were prepared by ultrasonicating platinum(II) acetylacetonate, copper(II) acetylacetonate, oleic acid, oleylamine in diphenyl ether (30 min).
    The solution was heated (220°C, 30 min), followed by the addition of molybdenum hexacarbonyl, followed by heating for another 30 min. The platinum-based alloy was cleaned with ethanol and cyclohexane, then suspended in 30 ml of cyclohexane.
    Ketjen black 300JD in cyclohexane was combined with the platinum alloy solution to achieve a 31.6 mass% loading on the carbon support, followed by ultrasonication. The resulting powder was mixed with acetic acid, ultrasonicated, centrifuged, and dispersed in an acetone-ethanol mixture, ultrasonicated again, and vacuum dried.
    Upon preparing a Nafion-based catalytic membrane, oxygen reduction reaction (ORR) characteristics as shown in the Figure below were obtained (measurement of geometric current density in the context of an accelerated durability test, 0.05-0.9 V at sweep rate of 200 mV/s at pH 0.1).

    Patent Image 1, Dongwoo Fine-Chem
    Patent Image 2, Dongwoo Fine-Chem

    This work suggest that the combination of Pt / Cu / Mo in an alloy results in resilient catalytic nanoparticles.

  • The premium version includes another two patent discussions, plus an Excel list with 50-100 commercially relevant recent patent families.
  • Triweekly patent lists for other categories (Excel files are included for premium users)

  • - Lithium metal containing batteries (excluding Li-S, Li-Air): XLSX
  • - Lithium-ion batteries – electrolytes – liquid: XLSX
  • - Lithium-ion batteries – separators: XLSX
  • - Lithium-sulfur batteries: XLSX
  • - Metal-air batteries: XLSX
  • - Na-ion batteries: XLSX
  • Prior patent updates

  • 2024-02-13
  • 2024-01-23
  • 2024-01-02
  • 2023-12-12
  • 2023-11-21
  • 2023-10-31
  • 2023-10-10
  • 2023-09-19