公开(公告)号：US11489202B2

公开(公告)日：2022-11-01

申请号：US16613871

申请日：2018-05-09

Applicant: NEC Corporation

Inventor： Takuya Hasegawa

IPC: H01M10/0568 ,  H01M4/134 ,  H01M4/505 ,  H01M4/525 ,  H01M10/0525 ,  H01M10/0567 ,  H01M10/0569 ,  H01M10/058 ,  H01M4/02

Abstract: An electrolyte solution capable of constituting a secondary battery in which a volume change due to charge and discharge is small and cycle characteristics are excellent is provided. The present example embodiment relates to an electrolyte solution for a lithium ion secondary battery comprising a fluorinated ether and a cyclic dicarboxylic acid ester.

公开(公告)号：US10230250B2

公开(公告)日：2019-03-12

申请号：US15033616

申请日：2014-10-31

Applicant: NEC Corporation ,  NEC ENERGY DEVICES, LTD.

Inventor： Shoichiro Shiraishi ,  Takuya Hasegawa ,  Tomoyuki Ichikawa

IPC: H02J7/00 ,  H02J7/04 ,  H01M10/44 ,  H01M10/48 ,  H01M10/0525

Abstract: A charging apparatus comprises a charge control unit. The charge control unit charges a secondary battery at a first current value until the voltage of the secondary battery reaches a predetermined first voltage value. The charge control unit, on detecting that the voltage has reached the first voltage value, performs control to charge the secondary battery at a second current value that is lower than the first current value, until a predetermined second voltage value is reached.

公开(公告)号：US11611107B2

公开(公告)日：2023-03-21

申请号：US16646612

申请日：2018-09-12

Applicant: NEC CORPORATION

Inventor： Takuya Hasegawa

IPC: H01M10/0569 ,  H01M4/38 ,  H01M4/505 ,  H01M4/525 ,  H01M10/0525 ,  H01M10/0568 ,  C07D327/00

Abstract: A purpose of the present invention is to provide a lithium ion secondary battery which has further improved life characteristics. The lithium ion secondary battery of the present invention is characterized by comprising a positive electrode comprising a positive electrode active material that operates at 4.5 V or more with respect to lithium, and an electrolyte solution comprising an electrolyte solvent comprising a fluorinated ether, a cyclic sulfonic acid ester and LiN(FSO2)2.

公开(公告)号：US11387442B2

公开(公告)日：2022-07-12

申请号：US16638824

申请日：2018-08-17

Applicant: NEC CORPORATION

Inventor： Daisuke Kawasaki ,  Takuya Hasegawa ,  Takashi Ohtsuka

IPC: H01M4/134 ,  H01M4/38 ,  H01M4/62 ,  H01M4/66 ,  H01M10/0525 ,  H01M10/0567 ,  H01M4/02

Abstract: Provided is a lithium ion secondary battery having high energy density and excellent cycle characteristics. The present invention relates to a negative electrode for a lithium ion secondary battery comprising: (i) a negative electrode mixture layer comprising a negative electrode active material and a negative electrode binder and (ii) a negative electrode current collector, wherein the negative electrode active material comprises an alloy comprising silicon (Si alloy), the Si alloy is crystalline and has a median diameter (D50 particle size) of 1.2 μm or less, and an amount of the negative electrode binder based on the weight of the negative electrode mixture layer is 12% by weight or more and 50% by weight or less.

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.

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.

公开(公告)号：US10749215B2

公开(公告)日：2020-08-18

申请号：US16082458

申请日：2017-03-03

Applicant: NEC Corporation

Inventor： Takehiro Noguchi ,  Shin Serizawa ,  Takuya Hasegawa

IPC: H01M10/0569 ,  H01M4/505 ,  H01M4/525 ,  H01M10/0525 ,  H01M10/058 ,  H01M4/02

Abstract: The purpose of the present invention is to provide a lithium secondary battery which has improved service life characteristics by suppressing a decomposition reaction of the electrolyte solution in the field of batteries that operate at high voltages or are assumed to be used at high temperatures for a long period of time. The present invention relates to an electrolyte solution for a secondary, which is characterized by containing a sulfone compound, a fluorine-containing cyclic acetal compound and a cyclic carbonate in a specific composition; and a secondary battery which uses this electrolyte solution for a secondary battery.

公开(公告)号：US10680271B2

公开(公告)日：2020-06-09

申请号：US15781196

申请日：2016-12-16

Applicant: NEC CORPORATION

Inventor： Takuya Hasegawa

IPC: H01M4/02 ,  H01M10/04 ,  H01M4/38 ,  H01M10/0585 ,  H01M4/133 ,  H01M4/134 ,  H01M4/48 ,  H01M10/0525 ,  H01M10/42

Abstract: The purpose of the present invention is to provide a secondary cell in which a decrease in energy density is inhibited. In order to achieve this purpose, this secondary cell has a positive electrode in which a positive electrode active material layer is provided on a positive electrode collector, and a negative electrode in which a negative electrode active material layer is provided on a negative electrode collector; the positive electrode active material layer and the negative electrode active material layer are laminated so as to face each other with a separator interposed therebetween; the negative electrode active material layer has a greater area than the positive electrode active material layer; and a thin section is provided in at least a part of the negative electrode active material layer at a location where the negative electrode active material layer does not face the positive electrode active material layer.

公开(公告)号：US11581581B2

公开(公告)日：2023-02-14

申请号：US16611335

申请日：2018-05-17

Applicant: NEC CORPORATION

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

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

Abstract: A purpose of the present invention is to provide a lithium ion secondary battery having improved battery characteristics. The lithium ion secondary battery according to the present invention comprises a negative electrode comprising a negative electrode active material comprising a silicon material and an electrolyte solution comprising an electrolyte solvent comprising an open chain sulfone compound, a fluorinated cyclic carbonate and an open chain carbonate and a supporting salt comprising LiN(FSO2)2.