公开(公告)号：US20180076449A1

公开(公告)日：2018-03-15

申请号：US15560360

申请日：2016-03-17

Applicant: NEC CORPORATION

Inventor： Jiro IRIYAMA ,  Ikiko SHIMANUKI ,  Takeshi AZAMI

IPC: H01M4/36 ,  H01M10/0525 ,  H01M4/131 ,  H01M4/133 ,  H01M4/1391 ,  H01M4/1393 ,  H01M4/485 ,  H01M4/583 ,  H01M4/04 ,  H01M10/058

CPC classification number: H01M4/364 ,  H01M4/0404 ,  H01M4/131 ,  H01M4/133 ,  H01M4/134 ,  H01M4/1391 ,  H01M4/1393 ,  H01M4/1395 ,  H01M4/366 ,  H01M4/386 ,  H01M4/485 ,  H01M4/583 ,  H01M4/587 ,  H01M4/625 ,  H01M10/0525 ,  H01M10/058 ,  H01M2220/20 ,  Y02P70/54

Abstract: A negative electrode for a lithium ion secondary battery is disclosed, which comprises, as active materials, (a) at least one material selected from metals capable of forming an alloy with lithium and metal oxides capable of absorbing and desorbing lithium ions (hereinafter referred to as metal and/or metal oxide), and (b) a surface-coated carbon material capable of absorbing and desorbing lithium ions; wherein, an average value of circularity of the metal and/or metal oxide particles defined by following formula (1) is 0.78 or more; Circularity=4πS/L2   (1) wherein S is an area of a projected image of particle and L is a circumferential length of the projected image of particle. The lithium ion secondary battery having this electrode has improved cycle characteristics.

公开(公告)号：US20200091559A1

公开(公告)日：2020-03-19

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

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.

公开(公告)号：US20170229736A1

公开(公告)日：2017-08-10

申请号：US15502027

申请日：2015-08-04

Applicant: NEC Corporation

Inventor： Ikiko SHIMANUKI ,  Hitoshi ISHIKAWA ,  Noboru YOSHIDA ,  Daisuke KAWASAKI

IPC: H01M10/0567 ,  H01M4/587 ,  H01M10/0569 ,  H01M4/505 ,  H01M4/525 ,  H01M10/0525 ,  H01M10/0585

CPC classification number: H01M10/0567 ,  H01M4/366 ,  H01M4/505 ,  H01M4/525 ,  H01M4/587 ,  H01M10/0525 ,  H01M10/0569 ,  H01M10/058 ,  H01M10/0585 ,  H01M10/446 ,  H01M2004/021 ,  H01M2220/20 ,  H01M2300/0037 ,  Y02E60/122 ,  Y02P70/54 ,  Y02T10/7011

Abstract: The present invention relates to a lithium secondary battery having a positive electrode comprising a positive electrode active material capable of absorbing and releasing lithium ions, a negative electrode comprising a negative electrode active material capable of absorbing and releasing lithium ions, and an electrolyte solution, wherein a positive electrode surface detection component comprises at least one negative secondary ion peak selected from CH3S2O6− and CHS2O4−, and further comprises a negative secondary ion peak of SO3—, wherein the positive electrode surface detection component is detected when a primary ion is irradiated on the surface of the positive electrode active material by a Time-of-Flight Secondary Ion Mass Spectrometry (TOF-SIMS) method. According to the present invention, it is possible to provide a lithium secondary battery having excellent cycle characteristics.

公开(公告)号：US20160226098A1

公开(公告)日：2016-08-04

申请号：US15021664

申请日：2014-07-11

Applicant: NEC CORPORATION

Inventor： Noboru YOSHIDA ,  Shinsaku SAITHO ,  Kazuaki MATSUMOTO ,  Ikiko SHIMANUKI ,  Daisuke KAWASAKI ,  Yuukou KATOU ,  Hitoshi ISHIKAWA

IPC: H01M10/0567 ,  H01M4/133 ,  H01M4/62 ,  H01M4/131 ,  H01M4/525 ,  H01M10/0568 ,  H01M4/587 ,  H01M4/36 ,  H01M4/505 ,  H01M10/0525 ,  H01M10/0569

CPC classification number: H01M10/0567 ,  H01M4/131 ,  H01M4/133 ,  H01M4/364 ,  H01M4/505 ,  H01M4/525 ,  H01M4/587 ,  H01M4/62 ,  H01M4/622 ,  H01M4/623 ,  H01M4/625 ,  H01M10/0525 ,  H01M10/0568 ,  H01M10/0569 ,  H01M10/4235 ,  H01M2004/027 ,  H01M2004/028 ,  H01M2300/0037 ,  Y02T10/7011

Abstract: It is an object of the present invention to provide an electrolytic solution capable of suppressing gas generation. The present exemplary embodiment is an electrolytic solution comprising a supporting salt, a nonaqueous solvent that dissolves the supporting salt, a cyclic sulfonic acid ester compound represented by predetermined formula (1), and an acid anhydride. According to the exemplary embodiment, an electrolytic solution capable of suppressing gas generation can be provided.

Abstract translation: 本发明的目的是提供一种能够抑制气体产生的电解液。 本示例性实施方案是包含支持盐，溶解负载盐的非水溶剂，由式（1）表示的环状磺酸酯化合物和酸酐的电解液。 根据本实施方式，可以提供能够抑制气体产生的电解液。

公开(公告)号：US20160028118A1

公开(公告)日：2016-01-28

申请号：US14771763

申请日：2014-02-28

Applicant: NEC CORPORATION

Inventor： Ikiko SHIMANUKI ,  Hitoshi ISHIKAWA ,  Daisuke KAWASAKI

IPC: H01M10/0567 ,  H01M10/0568 ,  H01M4/587 ,  H01M10/052 ,  H01M4/485 ,  H01M4/38 ,  H01M10/0569 ,  H01M2/02

CPC classification number: H01M10/0567 ,  H01M2/02 ,  H01M4/382 ,  H01M4/485 ,  H01M4/587 ,  H01M10/052 ,  H01M10/0568 ,  H01M10/0569 ,  H01M2004/027 ,  H01M2004/028 ,  H01M2220/20 ,  H01M2300/0025 ,  H01M2300/0028 ,  Y02E60/122 ,  Y02P70/54 ,  Y02T10/7011

Abstract: Disclosed is an electrolyte solution for lithium secondary batteries, including a cyclic sulfonic acid ester represented by the general formula (1): wherein, in the general formula (1), R1 and R2 each independently represent a hydrogen atom, an alkyl group having 1 to 5 carbon atoms, halogen or an amino group with the proviso that R1 and R2 do not represent hydrogen atoms at the same time; and R3 represents methylene which may be substituted with fluorine. Batteries using this electrolyte solution are excellent in battery properties and storage characteristics.

Abstract translation: 公开了一种锂二次电池用电解液，其包含通式（1）表示的环状磺酸酯：其中，在通式（1）中，R 1和R 2各自独立地表示氢原子，具有1个 至5个碳原子，卤素或氨基，条件是R1和R2不同时代表氢原子; 并且R 3表示可被氟取代的亚甲基。 使用这种电解质溶液的电池具有优异的电池性能和储存特性。

公开(公告)号：US20160020492A1

公开(公告)日：2016-01-21

申请号：US14771898

申请日：2014-02-28

Applicant: NEC Corporation

Inventor： Takeshi AZAMI ,  Noboru YOSHIDA ,  Ikiko SHIMANUKI

IPC: H01M10/0569 ,  H01M4/587 ,  H01M10/0525 ,  H01M4/133

CPC classification number: H01M10/0569 ,  H01M4/133 ,  H01M4/587 ,  H01M10/0525 ,  H01M10/0567 ,  H01M10/0568 ,  H01M2004/027 ,  H01M2300/0034 ,  Y02T10/7011

Abstract: A lithium ion secondary battery comprising a negative electrode comprising one or more types of carbon selected from the group consisting of natural graphite, artificial graphite, non-graphitizable carbon and easily graphitizable carbon; and an electrolyte solution comprising a cyclic sulfonic acid ester represented by the following formula (1); wherein in the formula (1), 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: 一种锂离子二次电池，其包含负极，所述负极包含选自天然石墨，人造石墨，不可石墨化碳和容易石墨化碳的一种或多种类型的碳; 和包含由下式（1）表示的环状磺酸酯的电解质溶液; 其中在式（1）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。