公开(公告)号：US20180248194A1

公开(公告)日：2018-08-30

申请号：US15753781

申请日：2015-08-21

Applicant: NEC CORPORATION

Inventor： Qian CHENG ,  Noriyuki TAMURA

IPC: H01M4/62 ,  C01B32/184 ,  H01M10/0525

CPC classification number: H01M4/625 ,  C01B32/184 ,  C01B32/192 ,  C01B2204/02 ,  C01B2204/04 ,  C01B2204/22 ,  C01P2006/10 ,  C01P2006/14 ,  C01P2006/16 ,  H01M4/587 ,  H01M10/052 ,  H01M10/0525 ,  H01M2220/20 ,  Y02E60/122 ,  Y02T10/7011

Abstract: A porous graphene material with 1 to 200 graphene layers, wherein: at least one monolayer graphene is included; pores with the size of 70 nm to 200 nm are scattered over the surface of the material and the number of pores is 10 to 500 per μm2; an oxygen concentration is below 0.8 atomic %; and the ratio of the peak height (ID) of D band in a Raman scattering spectrum of the material to that of the peak height (IG) of G band at 1,570 to 1,596 cm−1 in the spectrum (ID/IG) is between 1 and 1.35. The porous graphene material is suitable for conductive additives for electrodes of Lithium ion battery.

公开(公告)号：US20170283265A1

公开(公告)日：2017-10-05

申请号：US15506817

申请日：2014-08-29

Applicant: NEC Corporation

Inventor： Qian CHENG ,  Noriyuki TAMURA ,  Kentaro NAKAHARA

IPC: H01M10/0525 ,  H01M4/62 ,  C01B31/04 ,  H01M4/38

CPC classification number: H01M10/0525 ,  C01B32/05 ,  C01B32/182 ,  C01P2004/61 ,  H01M4/131 ,  H01M4/364 ,  H01M4/38 ,  H01M4/587 ,  H01M4/62 ,  H01M10/052 ,  H01M2004/027

Abstract: The present invention provides a novel carbon material comprising a three-dimensional graphene network constituting a plurality of cells interconnecting as a whole, where at least one of the cells has single-layer graphene wall. The carbon material is suitable for a lithium ion battery.

公开(公告)号：US20160190562A1

公开(公告)日：2016-06-30

申请号：US14910045

申请日：2014-08-20

Applicant: NEC CORPORATION

Inventor： Noriyuki TAMURA ,  Ryota YUGE ,  Qian CHENG ,  Kentaro NAKAHARA

IPC: H01M4/36 ,  H01M10/0525 ,  H01M4/505 ,  H01M4/38 ,  H01M4/525

CPC classification number: H01M4/366 ,  H01M4/131 ,  H01M4/386 ,  H01M4/483 ,  H01M4/505 ,  H01M4/525 ,  H01M10/052 ,  H01M10/0525 ,  H01M2004/027

Abstract: A negative electrode for a lithium ion secondary battery, including a negative electrode active material layer containing a negative electrode active material including silicon (Si) as a constituent element, in which a coating including iron (Fe), manganese (Mn) and oxygen (O) as constituent elements is formed on a surface of the negative electrode active material layer.

Abstract translation: 一种锂离子二次电池用负极，其包含含有作为构成元素的硅（Si）的负极活性物质的负极活性物质层，其中包含铁（Fe），锰（Mn）和氧（ O）作为构成元素形成在负极活性物质层的表面上。

公开(公告)号：US20160056452A1

公开(公告)日：2016-02-25

申请号：US14780949

申请日：2014-03-28

Applicant: NEC CORPORATION

Inventor： Noriyuki TAMURA ,  Qian CHENG ,  Ryota YUGE

IPC: H01M4/133 ,  H01M4/04 ,  H01M10/0525 ,  H01M4/1393 ,  H01M4/36 ,  H01M4/587

CPC classification number: H01M4/133 ,  H01M4/0404 ,  H01M4/0471 ,  H01M4/1393 ,  H01M4/366 ,  H01M4/587 ,  H01M10/052 ,  H01M10/0525 ,  H01M2004/027

Abstract: There is provided a negative electrode carbon material for a lithium secondary battery, including a graphite-based material in which holes are formed in a graphene layer plane.

Abstract translation: 提供了一种用于锂二次电池的负极碳材料，其包括其中在石墨烯层平面中形成空穴的石墨基材料。

公开(公告)号：US20180248187A1

公开(公告)日：2018-08-30

申请号：US15758132

申请日：2015-09-09

Applicant: NEC CORPORATION

Inventor： Qian CHENG ,  Noriyuki TAMURA

IPC: H01M4/587 ,  H01M4/62 ,  H01M10/0525 ,  H01M4/36 ,  C01B32/05

CPC classification number: H01M4/587 ,  C01B32/05 ,  C01P2006/11 ,  C01P2006/14 ,  C01P2006/16 ,  H01M4/366 ,  H01M4/625 ,  H01M10/0525

Abstract: To provide an anode material for implementing a lithium-ion battery that is capable of high-speed charging and excellent in cycle characteristics, and has high capacity. The anode material includes a spherical particle of graphite or graphite-carbon composite provided with pores on the surface and inner channels in the core part of the particle, the inner channels being interconnected to the pores.

公开(公告)号：US20180145371A1

公开(公告)日：2018-05-24

申请号：US15736067

申请日：2016-06-23

Applicant: NEC CORPORATION

Inventor： Katsumi MAEDA ,  Noriyuki TAMURA ,  Sadanori HATTORI

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

CPC classification number: H01M10/0567 ,  H01M4/505 ,  H01M4/525 ,  H01M10/052 ,  H01M10/0525 ,  H01M10/0569 ,  H01M2004/028 ,  H01M2300/0037 ,  Y02T10/7011

Abstract: In terms of a lithium ion secondary battery using, in a positive electrode, a lithium transition metal composite oxide containing an over-stoichiometric amount of lithium, a lithium ion secondary battery in which an amount of a gas generated during charge/discharge cycles is reduced and capacity retention is improved is provided. The lithium ion secondary battery includes a positive electrode containing a lithium transition metal composite oxide containing Fe and containing an over-stoichiometric amount of lithium, and a nonaqueous electrolyte solution, and the nonaqueous electrolyte solution contains a nonaqueous organic solvent, an electrolyte, and lithium difluorophosphate.

公开(公告)号：US20180069236A1

公开(公告)日：2018-03-08

申请号：US15551853

申请日：2016-02-09

Applicant: NEC Corporation ,  Tanaka Chemical Corporation

Inventor： Ryota YUGE ,  Noriyuki TAMURA ,  Sadanori HATTORI ,  Mitsuharu TABUCHI ,  Kentaro KURATANI ,  Kyousuke DOUMAE ,  Hideka SHIBUYA

IPC: H01M4/36 ,  C01G53/00 ,  C01F17/00 ,  H01M4/525 ,  H01M4/505 ,  H01M4/48 ,  H01M10/0525

CPC classification number: H01M4/366 ,  C01F17/0043 ,  C01G53/44 ,  C01G53/50 ,  C01P2002/70 ,  C01P2004/03 ,  C01P2004/84 ,  C01P2006/40 ,  H01M4/483 ,  H01M4/505 ,  H01M4/525 ,  H01M10/0525 ,  H01M2004/027 ,  H01M2004/028 ,  Y02T10/7011

Abstract: There is provided a lithium-iron-manganese-based composite oxide capable of providing a lithium-ion secondary battery which has a high capacity retention rate in charge/discharge cycles and in which the generation of a gas caused by charge/discharge cycles is suppressed. A lithium-iron-manganese-based composite oxide having a layered rock-salt structure, wherein at least a part of the surface of a lithium-iron-manganese-based composite oxide represented by the following formula is coated with an oxide of at least one metal selected from the group consisting of La, Pr, Nd, Sm and Eu: LixM1(y-p)MnpM2(z-q)FeqO(2-δ) wherein 1.05≦x≦1.32, 0.33≦y≦0.63, 0.06≦z≦0.50, 0

公开(公告)号：US20170133680A1

公开(公告)日：2017-05-11

申请号：US15127293

申请日：2015-03-23

Applicant: NEC Corporation

Inventor： Qian CHENG ,  Noriyuki TAMURA

IPC: H01M4/587 ,  H01M4/36 ,  B01J13/04

CPC classification number: H01M4/587 ,  B01J13/04 ,  C01B32/20 ,  C01P2004/20 ,  C01P2004/80 ,  C01P2006/12 ,  C01P2006/40 ,  H01M4/366 ,  H01M10/052 ,  H01M2004/021 ,  H01M2004/027 ,  Y02T10/7011

Abstract: In order to provide a negative electrode carbon material capable of providing a lithium secondary battery improved in the capacity and the rate characteristic, there are carried out a first heat treatment of subjecting graphite particles to a heat treatment in an oxidizing atmosphere, and following the first heat treatment, a second heat treatment of subjecting the resulting graphite particles to a heat treatment in an inert gas atmosphere at a higher temperature than in the first heat treatment.

公开(公告)号：US20160276671A1

公开(公告)日：2016-09-22

申请号：US15171975

申请日：2016-06-02

Applicant: NEC Corporation

Inventor： Ryota YUGE ,  Noriyuki TAMURA

IPC: H01M4/62 ,  H01M4/38 ,  H01M4/587 ,  H01M10/0525 ,  H01M4/36

CPC classification number: H01M4/625 ,  H01M4/0402 ,  H01M4/13 ,  H01M4/131 ,  H01M4/133 ,  H01M4/134 ,  H01M4/139 ,  H01M4/362 ,  H01M4/366 ,  H01M4/386 ,  H01M4/587 ,  H01M10/0525 ,  H01M2004/027 ,  H01M2220/20 ,  H01M2220/30

Abstract: It is an object of an exemplary embodiment of the present invention to provide a negative electrode active material having excellent rate characteristics and cycle characteristics. One embodiment according to the present invention is a negative electrode active material comprising a carbon-containing composite, wherein, in the carbon-containing composite, an active material capable of intercalating and deintercalating lithium, conductive nanofibers and conductive carbon particles are coated with a carbon material and are integrated.

公开(公告)号：US20190044182A1

公开(公告)日：2019-02-07

申请号：US15759662

申请日：2016-08-08

Applicant: NEC CORPORATION

Inventor： Katsumi MAEDA ,  Noriyuki TAMURA ,  Mika SHIBA

IPC: H01M10/0525 ,  H01M4/485 ,  H01M4/587 ,  H01M10/0567 ,  H01M10/0569 ,  H01M10/0568

Abstract: Provided are a lithium secondary battery high in capacity and excellent in charge and discharge rate characteristics, and a method for producing the same. The lithium secondary battery of the present invention includes a positive electrode containing a positive electrode active substance containing a lithium transition metal oxide, a negative electrode containing a negative electrode active substance containing a heat-treated graphite material, and an electrolytic solution, wherein the heat-treated graphite material has passages of lithium ions penetrating at least one or more layers of graphene layers from the surface of a graphene stacking structure; and the electrolytic solution contains lithium difluorophosphate.