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    Lithium ion secondary battery
    3.
    发明授权
    Lithium ion secondary battery 有权

    公开(公告)号：US11329321B2

    公开(公告)日：2022-05-10

    申请号：US16617629

    申请日：2018-05-23

    Applicant: NEC Corporation

    Inventor： Takehiro Noguchi ,  Takuya Hasegawa ,  Ikiko Shimanuki ,  Daisuke Kawasaki

    IPC: H01M10/0569 ,  H01M4/38 ,  H01M4/505 ,  H01M4/525 ,  H01M10/0525 ,  H01M10/0568 ,  H01M10/0585 ,  H01M4/02

    Abstract: A lithium ion secondary battery having high energy density and being excellent in cycle characteristics is provided. The present invention relates to a lithium ion secondary battery comprising: a negative electrode active material comprising a material comprising silicon as a constituent element; and an electrolyte solution comprising: a non-aqueous solvent comprising a fluorinated ether compound, an open-chain sulfone compound, and a cyclic carbonate compound, and a supporting salt comprising LiPF6, lithium bis(fluorosulfonyl)imide, and lithium bis(oxalato)borate (LiBOB); wherein the content of LiBOB in the electrolyte solution is 0.2 mass % or more.

    Lithium ion secondary battery
    4.
    发明授权
    Lithium ion secondary battery 有权

    公开(公告)号：US10923770B2

    公开(公告)日：2021-02-16

    申请号：US16465428

    申请日：2017-11-30

    Applicant: NEC Corporation

    Inventor： Takehiro Noguchi ,  Takuya Hasegawa ,  Daisuke Kawasaki ,  Ikiko Shimanuki

    IPC: H01M10/0569 ,  H01M10/0525 ,  H01M4/134 ,  H01M4/58

    Abstract: A purpose of one embodiment of the present invention is to provide a lithium ion secondary battery that has improved life-span characteristics. The first lithium ion secondary battery of the present invention comprises an electrolyte solution comprising a sulfone compound, a fluorinated ether compound and LiN(FSO2)2, and a negative electrode comprising a silicon material, wherein a content of LiN(FSO2)2 in the electrolyte solution is more than 5 weight % and 20 weight % or less.

    GEL ELECTROLYTE AND POLYMER SECONDARY BATTERY USING SAME
    5.
    发明申请
    GEL ELECTROLYTE AND POLYMER SECONDARY BATTERY USING SAME 有权
    使用相同的凝胶电解质和聚合物二次电池

    公开(公告)号：US20160013514A1

    公开(公告)日：2016-01-14

    申请号：US14771684

    申请日：2014-02-28

    Applicant: NEC Corporation ,  NEC Energy Devices, Ltd.

    Inventor： Noboru Yoshida ,  Ikiko Shimanuki ,  Shinako Kaneko ,  Hitoshi Ishikawa

    IPC: H01M10/0565

    CPC classification number: H01M10/0565 ,  H01M10/052 ,  H01M2300/0085 ,  Y02T10/7011

    Abstract: The present invention relates to a gel electrolyte comprising a cyclic sulfonic acid ester represented by formula (1). According to the present invention, it is possible to provide a gel electrolyte capable of suppressing the self-discharge of a polymer secondary battery, and a polymer secondary battery using the gel electrolyte. wherein R1 and R2 are each independently a hydrogen atom, an alkyl group having 1 to 5 carbon atoms, a halogen group or an amino group with the proviso that R1 and R2 are not hydrogen atoms at the same time; R3 represents a linkage group selected from the group consisting of an alkylene group having 1 to 5 carbon atoms, a carbonyl group, a sulfonyl group, a fluoroalkylene group having 1 to 6 carbon atoms, and a divalent group having 2 to 6 carbon atoms in which alkylene units or fluoroalkylene units are bonded through an ether group.

    Abstract translation: 本发明涉及包含由式（1）表示的环状磺酸酯的凝胶电解质。 根据本发明，可以提供能够抑制聚合物二次电池的自放电的凝胶电解质和使用凝胶电解质的聚合物二次电池。 其中R 1和R 2各自独立地为氢原子，具有1至5个碳原子的烷基，卤素基团或氨基，条件是R 1和R 2不同时为氢原子; R3表示选自碳原子数1〜5的亚烷基，羰基，磺酰基，碳原子数1〜6的氟代亚烷基，碳原子数2〜6的2价基团的连接基团， 哪个亚烷基单元或氟亚烷基单元通过醚基键合。

    Lithium ion secondary battery
    7.
    发明授权
    Lithium ion secondary battery 有权

    公开(公告)号：US10756337B2

    公开(公告)日：2020-08-25

    申请号：US15779660

    申请日：2016-11-29

    Applicant: NEC Corporation

    Inventor： Ikiko Shimanuki ,  Suguru Tamai ,  Daisuke Kawasaki ,  Hitoshi Ishikawa

    IPC: H01M4/36 ,  H01M4/38 ,  H01M4/48 ,  H01M10/0525 ,  H01M10/0567 ,  H01M10/0569 ,  H01M10/058 ,  H01M4/62 ,  H01M4/02

    Abstract: When the particle size of a silicon material used for a negative electrode active material are small, a large surface area thereof easily causes a side reaction between the active material and an electrolyte solvent to occur, and the cycle characteristics of a lithium ion secondary battery decrease. In order to improve the cycle characteristics, a lithium ion secondary battery according to the present invention is characterized in comprising a negative electrode comprising a material comprising silicon as a constituent element and a polyacrylic acid, and an electrolyte solution comprising a fluoroethylene carbonate, wherein the 50% particle size of the material comprising silicon as a constituent element is 2 μm or less.

    Method for producing secondary battery
    10.
    发明授权
    Method for producing secondary battery 有权

    公开(公告)号：US09859589B2

    公开(公告)日：2018-01-02

    申请号：US15103402

    申请日：2014-08-08

    Applicant: NEC Corporation

    Inventor： Jiro Iriyama ,  Makihiro Otohata ,  Kazuaki Matsumoto ,  Ikiko Shimanuki

    IPC: H01M10/052 ,  H01M10/0585 ,  H01M10/0569 ,  H01M10/058 ,  H01M10/05 ,  H01M2/12 ,  H01M2/36 ,  H01M10/44

    CPC classification number: H01M10/0585 ,  H01M2/12 ,  H01M2/36 ,  H01M2/361 ,  H01M2/362 ,  H01M2/365 ,  H01M10/05 ,  H01M10/0569 ,  H01M10/058 ,  H01M10/446

    Abstract: It is an object of the present invention to provide a method for producing a secondary battery in which water in the outer package can be removed even when the secondary battery includes an electrolytic solution containing a halogen-containing compound. The present exemplary embodiment is a method for producing a secondary battery including an electrolytic solution containing a supporting salt, a nonaqueous solvent, and a halogen-containing compound, an electrode assembly including a negative electrode and a positive electrode, and an outer package, the method including (1) disposing a first solution containing at least the supporting salt and the nonaqueous solvent, and the electrode assembly in the outer package; (2) charging the electrode assembly; (3) emitting from the outer package a gas generated by the charge; and (4) injecting a second solution including at least the halogen-containing compound into the outer package after the gas is emitted, wherein the first solution does not contain the halogen-containing compound, and the electrolytic solution includes the first solution and the second solution.

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