METHOD FOR PRODUCING LITHIUM SULFATE AND TRANSITION METAL SULFATE

    公开(公告)号:US20240286912A1

    公开(公告)日:2024-08-29

    申请号:US18578865

    申请日:2022-07-07

    申请人: TODA KOGYO CORP.

    IPC分类号: C01D15/06 C22B3/44 H01M10/54

    CPC分类号: C01D15/06 C22B3/44 H01M10/54

    摘要: The present invention is to provide a means for efficiently and economically separating and recovering transition metals including nickel and cobalt, and lithium from an aqueous sulfate solution comprising the transition metal and lithium as major components.
    The present invention is a process for producing lithium sulfate comprising:



    a step of concentration-crystallization to an aqueous solution comprising at least lithium sulfate and a transition metal sulfate as main components so as to obtain a slurry comprising lithium sulfate as a solid content, and
    a step of solid-liquid separation of the slurry obtained in the step of concentration-crystallization so as to separate lithium crystals and a crystallization mother liquor.

    PROCESS FOR PRODUCING LITHIUM HYDROXIDE
    2.
    发明公开

    公开(公告)号:US20240240330A1

    公开(公告)日:2024-07-18

    申请号:US18562214

    申请日:2023-01-05

    申请人: TODA KOGYO CORP.

    IPC分类号: C25B1/16 B01D9/02 C25B1/22

    CPC分类号: C25B1/16 B01D9/02 C25B1/22

    摘要: The present invention provides an efficient producing method of high-purity lithium hydroxide, capable of increasing the yield of lithium hydroxide, removing alkali metal impurities, and reducing the amount of by-products generated.
    A process for producing lithium hydroxide from lithium sulfate as a starting material containing at least one of sodium and potassium as impurities, which process comprises the following steps of (A) to (F):



    (A) a production step of an aqueous lithium hydroxide solution and sulfuric acid by an electrochemical membrane separation method using lithium sulfate as a raw material;
    (B) a crystallization step producing a lithium hydroxide crystal by crystallization using the obtained aqueous lithium hydroxide solution in the above electrochemical membrane separation step as a raw material;
    (C) a solid-liquid separation step in which a portion of slurry in the above crystallization step is discharged and is subjected to solid-liquid separation to separate a lithium hydroxide crystal and crystallization mother liquor, and thereafter a washing step to clean the separated solid content;
    (D) a carbonation step obtaining a slurry comprising a lithium-containing carbonate compound as a solid content by discharging a portion of crystallization mother liquor in said crystallization step and reacting said discharged crystallization mother liquor with carbon dioxide gas, and a solid-liquid separation step separating said slurry into a lithium-containing solid content and a liquid content;
    (E) an acid dissolution step producing a lithium sulfate aqueous solution by reacting said lithium-containing solid content with sulfuric acid;
    (F) a mixing step reusing the lithium sulfate aqueous solution obtained by said acid dissolution step as the raw material of said step of (A).

    MODULE SUBSTRATE ANTENNA AND MODULE SUBSTRATE USING SAME

    公开(公告)号:US20230006352A1

    公开(公告)日:2023-01-05

    申请号:US17756369

    申请日:2020-12-01

    申请人: TODA KOGYO CORP.

    发明人: Jun KOUJIMA

    IPC分类号: H01Q7/00 H05K1/02

    摘要: A module substrate antenna (1) includes a first coil (7) and a second coil (8) that are connected in parallel. The first coil (7) is composed of a pattern in which a spiral first antenna coil pattern (3a) and a spiral second antenna coil pattern (5a) are interlayer-connected in series. The second coil (8) is composed of a pattern in which a spiral third antenna coil pattern (4a) and a spiral fourth antenna coil pattern (6a) are interlayer-connected in series. The coil patterns are arranged in order of the first antenna coil pattern (3a), the third antenna coil pattern (4a), the second antenna coil pattern (5a), and the fourth antenna coil pattern (6a).

    LITHIUM NICKELATE-BASED POSITIVE ELECTRODE ACTIVE SUBSTANCE PARTICLES AND PROCESS FOR PRODUCING THE SAME, AND NON-AQUEOUS ELECTROLYTE SECONDARY BATTERY

    公开(公告)号:US20200212442A1

    公开(公告)日:2020-07-02

    申请号:US16805990

    申请日:2020-03-02

    申请人: TODA KOGYO CORP.

    摘要: The present invention provides lithium nickelate-based positive electrode active substance particles having a high energy density which are excellent in charge/discharge cycle characteristics when highly charged, and hardly suffer from generation of gases upon storage under high-temperature conditions, and a process for producing the positive electrode active substance particles, as well as a non-aqueous electrolyte secondary battery. The present invention relates to positive electrode active substance particles each comprising a core particle X comprising a lithium nickelate composite oxide having a layer structure which is represented by the formula: Li1+aNi1−b−cCobMcO2 wherein M is at least one element selected from the group consisting of Mn, Al, B, Mg, Ti, Sn, Zn and Zr; a is a number of −0.1 to 0.2 (−0.1⋅a⋅0.2); b is a number of 0.05 to 0.5 (0.05⋅b⋅0.5); and c is a number of 0.01 to 0.4 (0.01⋅c⋅0.4); a coating compound Y comprising at least one element selected from the group consisting of Al, Mg, Zr, Ti and Si; and a coating compound Z comprising an Li element, in which a content of lithium hydroxide LiOH in the positive electrode active substance particles is not more than 0.40% by weight, a content of lithium carbonate Li2CO3 in the positive electrode active substance particles is not more than 0.65% by weight, and a weight ratio of the content of lithium carbonate to the content of lithium hydroxide is not less than 1.