公开(公告)号：US20190280290A2

公开(公告)日：2019-09-12

申请号：US15560890

申请日：2016-03-22

Applicant: NEC Corporation

Inventor： Takeshi AZAMI

IPC: H01M4/36 ,  H01M10/0525 ,  H01M4/48 ,  H01M4/587 ,  H01M10/0585

Abstract: A lithium ion secondary battery having more improved cycle characteristics is provided. The present invention relates to a lithium ion secondary battery having a negative electrode comprising a graphite and a silicon oxide having a composition represented by SiOx (0

公开(公告)号：US20180053935A1

公开(公告)日：2018-02-22

申请号：US15560913

申请日：2016-03-22

Applicant: NEC CORPORATION

Inventor： Takeshi AZAMI

IPC: H01M4/587 ,  H01M10/0566 ,  H01M10/0525 ,  H01M4/131

Abstract: A lithium ion secondary battery having more improved cycle characteristics is provided. The present invention provides a lithium ion secondary battery which comprises a negative electrode comprising graphite particles, silicon oxide particles having a composition represented by SiOx (0

公开(公告)号：US20160226099A1

公开(公告)日：2016-08-04

申请号：US15021669

申请日：2014-08-28

Applicant: NEC CORPORATION

Inventor： Takeshi AZAMI ,  Hitoshi ISHIKAWA ,  Noboru YOSHIDA ,  Ikiko SHIMANUKI ,  Kazuaki MATSUMOTO ,  Makihiro OTOHATA

IPC: H01M10/0567 ,  H01M4/131 ,  H01M4/505 ,  H01M10/0568 ,  H01M4/66 ,  H01M4/133 ,  H01M2/16 ,  H01M10/0569 ,  H01M10/0525 ,  H01M4/62

CPC classification number: H01M10/0567 ,  H01M2/1653 ,  H01M4/131 ,  H01M4/133 ,  H01M4/364 ,  H01M4/505 ,  H01M4/587 ,  H01M4/622 ,  H01M4/623 ,  H01M4/625 ,  H01M4/661 ,  H01M10/0525 ,  H01M10/0568 ,  H01M10/0569 ,  H01M2004/027 ,  H01M2004/028 ,  H01M2300/0037 ,  Y02T10/7011

Abstract: The present invention provides a lithium ion secondary battery comprising: a positive electrode; a negative electrode comprising a negative electrode active material comprising at least one carbon material selected from the group consisting of a natural graphite, an artificial graphite, a non-graphitizable carbon and a graphitizable carbon; and an electrolyte solution comprising a specific cyclic disulfonate ester compound and an acid anhydride.

Abstract translation: 本发明提供一种锂离子二次电池，其包括：正极; 包含负极活性物质的负极，所述负极活性物质包含选自天然石墨，人造石墨，不可石墨化碳和可石墨化碳的至少一种碳材料; 以及包含特定的环状二磺酸酯化合物和酸酐的电解质溶液。

公开(公告)号：US20150349332A1

公开(公告)日：2015-12-03

申请号：US14759677

申请日：2014-01-10

Applicant: NEC CORPORATION

Inventor： Takeshi AZAMI ,  Hitoshi ISHIKAWA

IPC: H01M4/36 ,  H01M10/0567 ,  H01M10/0525 ,  H01M4/587 ,  H01M4/58 ,  H01M4/133 ,  H01M4/136

CPC classification number: H01M4/364 ,  H01M4/0447 ,  H01M4/133 ,  H01M4/136 ,  H01M4/581 ,  H01M4/587 ,  H01M4/622 ,  H01M4/625 ,  H01M10/0525 ,  H01M10/0567 ,  H01M10/058 ,  H01M2004/027 ,  H01M2300/0025 ,  Y10T29/49112

Abstract: The present invention relates to a negative electrode for a lithium ion secondary battery, the negative electrode containing a negative electrode active material containing a first carbon and a second carbon, in which the first carbon is spherical graphite, the second carbon is massive graphite, and the sulfur concentration in the first carbon (Sx) and the sulfur concentration in the second carbon (Sy) are each independently 0 ppm or more and 300 ppm or less.

Abstract translation: 锂离子二次电池用负极技术领域本发明涉及锂离子二次电池用负极，所述负极含有含有第一碳和第二碳的负极活性物质，其中，所述第一碳为球形石墨，所述第二碳为块状石墨， 第一碳（Sx）中的硫浓度和第二碳（Sy）中的硫浓度各自独立地为0ppm以上且300ppm以下。

公开(公告)号：US20200328418A1

公开(公告)日：2020-10-15

申请号：US16760791

申请日：2018-10-31

Applicant: NEC CORPORATION

Inventor： Takeshi AZAMI

IPC: H01M4/525 ,  H01M4/131 ,  H01M4/505 ,  H01M4/36 ,  H01M10/0525 ,  H01M4/1391 ,  H01M4/62

Abstract: A purpose of the present invention is to provide a lithium ion secondary battery having more improved life characteristics while suppressing gelation of an electrode mixture slurry in a manufacturing process. The lithium ion secondary battery according to the present invention comprises a positive electrode having a positive electrode mixture layer comprising a layered lithium-nickel composite oxide in which a proportion of nickel in metals other than lithium is 80 mol % or more; LiOH; Li2CO3; and a chlorine-containing polyvinylidene fluoride-based polymer, wherein a content of LiOH in the positive electrode mixture layer and a content of Li2CO3 in the positive electrode mixture layer are each 0.1 weight % or more and 2.1 weight % or less, a total content of LiOH and Li2CO3 in the positive electrode mixture layer is 0.2 weight % or more and 4.2 weight % or less, and a content of chlorine in the positive electrode mixture layer is 30 μg/g or more and 120 μg/g or less.

公开(公告)号：US20190280284A1

公开(公告)日：2019-09-12

申请号：US16332987

申请日：2017-08-03

Applicant: NEC CORPORATION

Inventor： Takeshi AZAMI

IPC: H01M4/131 ,  H01M4/1391 ,  H01M10/0525

Abstract: A purpose of one embodiment of the present invention is to provide a lithium ion secondary battery which comprises lithium nickel composite oxide having high nickel content in a positive electrode and has excellent battery characteristics. The first lithium ion secondary battery of the present invention comprises a lithium nickel composite oxide represented by the following formula and carbon nanotubes in a positive electrode, wherein a ratio (a)/(b) of an average length (a) of the carbon nanotubes to an average particle size (b) of primary particles of the lithium nickel composite oxide is 0.5 or more, LiyNi(1-x)MxO2 wherein 0≤x≤0.4, 0

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：US20180261878A1

公开(公告)日：2018-09-13

申请号：US15534254

申请日：2015-12-11

Applicant: NEC Corporation

Inventor： Takeshi AZAMI

IPC: H01M10/0525 ,  H01M10/0567 ,  H01M10/0569 ,  H01M10/058 ,  H01M2/16 ,  H01M4/50 ,  H01M4/525 ,  H01M4/583 ,  H01M10/48 ,  H01M4/66

CPC classification number: H01M10/0525 ,  H01M2/16 ,  H01M4/50 ,  H01M4/525 ,  H01M4/583 ,  H01M4/587 ,  H01M4/661 ,  H01M10/0567 ,  H01M10/0569 ,  H01M10/058 ,  H01M10/48 ,  H01M2004/027 ,  H01M2004/028 ,  H01M2220/20 ,  Y02E60/122 ,  Y02P70/54 ,  Y02T10/7011

Abstract: There is provided a lithium ion secondary battery having excellent cycle characteristics at a high temperature and comprising lithium nickel composite oxides, in which the Ni content is high, in a positive electrode. The present invention relates to a lithium ion secondary battery having a positive electrode, a negative electrode and an electrolyte solution, wherein the positive electrode comprises a lithium nickel complex oxide denoted by the general formula, LiNixCoyMnzO2, wherein x, y, and z are respectively 0.75≤x≤0.85, 0.05≤y≤0.15, and 0.10≤z≤0.20.

公开(公告)号：US20180198159A1

公开(公告)日：2018-07-12

申请号：US15742184

申请日：2016-07-08

Applicant: NEC Corporation

Inventor： Takeshi AZAMI

IPC: H01M10/0525 ,  H01M10/0569 ,  H01M10/0567 ,  H01M10/0585 ,  H01M4/133 ,  H01M4/48 ,  H01M4/70 ,  H01M4/62 ,  B82Y30/00

CPC classification number: H01M10/0525 ,  B82Y30/00 ,  H01M4/133 ,  H01M4/48 ,  H01M4/587 ,  H01M4/623 ,  H01M4/625 ,  H01M4/70 ,  H01M10/0567 ,  H01M10/0569 ,  H01M10/0585 ,  H01M2004/021 ,  H01M2004/027 ,  H01M2004/028 ,  H01M2300/0028 ,  Y02E60/122 ,  Y02T10/7011

Abstract: Use of a silicon-based material in a negative electrode of a lithium ion secondary battery results in a decrease in discharge capacity and an increase in internal resistance. In order to overcome this, the lithium ion secondary battery according to the present invention is characterized in having a negative electrode comprising a carbon nanotube having a peak between 2600 and 2800 cm−1 in a Raman spectrum obtained by Raman spectroscopy, a graphite, and a silicon oxide having a composition represented by SiOx (0

公开(公告)号：US20180123123A1

公开(公告)日：2018-05-03

申请号：US15560890

申请日：2016-03-22

Applicant: NEC CORPORATION

Inventor： Takeshi AZAMI

IPC: H01M4/36 ,  H01M10/0525 ,  H01M4/48 ,  H01M4/587 ,  H01M10/0585

CPC classification number: H01M4/364 ,  C01B32/00 ,  H01M4/13 ,  H01M4/483 ,  H01M4/587 ,  H01M10/0525 ,  H01M10/0585 ,  H01M2004/027 ,  H01M2220/20 ,  Y02P70/54 ,  Y02T10/7011

Abstract: A lithium ion secondary battery having more improved cycle characteristics is provided. The present invention relates to a lithium ion secondary battery having a negative electrode comprising a graphite and a silicon oxide having a composition represented by SiOx (0