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：US20160301225A1

公开(公告)日：2016-10-13

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

CPC classification number: H02J7/0029 ,  H01M10/0525 ,  H01M10/443 ,  H01M10/486 ,  H02J7/007 ,  H02J7/045 ,  H02J7/047 ,  H02J2007/0037

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.

Abstract translation: 充电装置包括充电控制单元。 充电控制单元以第一电流值对二次电池充电直到二次电池的电压达到预定的第一电压值。 充电控制单元在检测到电压达到第一电压值时，以低于第一电流值的第二电流值对二次电池进行充电控制，直到达到预定的第二电压值。

公开(公告)号：US20190393554A1

公开(公告)日：2019-12-26

申请号：US16465428

申请日：2017-11-30

Applicant: NEC Corporation

Inventor： Takehiro NOGUCHI ,  Takuya HASEGAWA ,  Daisuke KAWASAKI ,  lkiko 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：US20180358645A1

公开(公告)日：2018-12-13

申请号：US15781196

申请日：2016-12-16

Applicant: NEC CORPORATION

Inventor： Takuya HASEGAWA

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

CPC classification number: H01M10/04 ,  H01M4/133 ,  H01M4/134 ,  H01M4/38 ,  H01M4/483 ,  H01M10/0413 ,  H01M10/0525 ,  H01M10/0585 ,  H01M2004/025 ,  H01M2010/4292 ,  H01M2220/20 ,  Y02E60/122 ,  Y02T10/7011

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：US20200266491A1

公开(公告)日：2020-08-20

申请号：US16646612

申请日：2018-09-12

Applicant: NEC CORPORATION

Inventor： Takuya HASEGAWA

IPC: H01M10/0569 ,  H01M10/0525 ,  H01M10/0568 ,  H01M4/38 ,  H01M4/505 ,  H01M4/525 ,  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：US20200168955A1

公开(公告)日：2020-05-28

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 ,  H01M4/38 ,  H01M10/0568 ,  H01M10/0585

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.

公开(公告)号：US20190123337A1

公开(公告)日：2019-04-25

申请号：US16082689

申请日：2017-03-29

Applicant: NEC CORPORATION

Inventor： Takuya HASEGAWA

IPC: H01M4/131 ,  H01M4/134 ,  H01M4/38 ,  H01M2/30 ,  H01M10/0525

Abstract: In order to provide a negative electrode for a lithium secondary battery providing a high electrode density, i.e., a high volumetric energy density, and improved in life characteristics and a lithium secondary battery using the negative electrode, the present invention uses a negative electrode for a lithium secondary battery, in which a negative electrode active material layer (2a, 2b) formed on a negative electrode current collector 3 comprises at least first particles 4, second particles 5 and a binder 6, the first particles 4 are formed of SiOχ (0

公开(公告)号：US20180076486A1

公开(公告)日：2018-03-15

申请号：US15554556

申请日：2016-03-04

Applicant: NEC CORPORATION

Inventor： Takehiro NOGUCHI ,  Kenichi SHIMURA ,  Shin SERIZAWA ,  Yuukou KATOU ,  Takuya HASEGAWA

IPC: H01M10/0569 ,  H01M10/052 ,  H01M10/058 ,  H01M4/505 ,  H01M4/525 ,  H01M10/0567 ,  H01M4/131

CPC classification number: H01M10/0569 ,  H01M2/16 ,  H01M2/162 ,  H01M4/131 ,  H01M4/505 ,  H01M4/525 ,  H01M10/052 ,  H01M10/0567 ,  H01M10/058 ,  H01M10/0585 ,  H01M2220/20 ,  H01M2300/0034 ,  H01M2300/0037 ,  H01M2300/004 ,  Y02E60/122 ,  Y02P70/54 ,  Y02T10/7011

Abstract: A lithium ion secondary battery excellent in cycle characteristics and rate characteristics is provided. The present invention relates to a lithium secondary battery having an electrolyte solution comprising one or more compounds selected from a fluorinated ether and a fluorinated phosphate ester and a separator comprising an aramid resin.

公开(公告)号：US20190089003A1

公开(公告)日：2019-03-21

申请号：US16082458

申请日：2017-03-03

Applicant: NEC Corporation

Inventor： Takehiro NOGUCHI ,  Shin SERIZAWA ,  Takuya HASEGAWA

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

CPC classification number: H01M10/0569 ,  H01M4/505 ,  H01M4/525 ,  H01M10/0525 ,  H01M10/058 ,  H01M2004/021 ,  H01M2220/20 ,  H01M2300/0034 ,  H01M2300/0037 ,  Y02E60/122 ,  Y02T10/7011

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：US20190027786A1

公开(公告)日：2019-01-24

申请号：US16070046

申请日：2017-01-12

Applicant: NEC Corporation

Inventor： Takehiro NOGUCHI ,  Takuya HASEGAWA ,  Shin SERIZAWA

IPC: H01M10/0569 ,  H01M10/0525 ,  H01M10/0567 ,  H01M4/505 ,  H01M4/525 ,  H01M4/58

Abstract: The purpose of the present embodiment is to provide a lithium secondary battery which is assumed to be operated at a high voltage or to be used at high temperatures for a long period of time, and which has improved life characteristics by suppressing a decomposition reaction of the electrolyte solution. The present embodiment relates to an electrolyte solution for a secondary battery containing a sulfone compound, a fluorine containing ether and an acid anhydride at a specific composition, and a secondary battery which uses this electrolyte solution for a secondary battery.