公开(公告)号：US20210226207A1

公开(公告)日：2021-07-22

申请号：US16306366

申请日：2017-06-13

Applicant: NEC Corporation

Inventor： Qian CHENG

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

Abstract: In order to provide a lithium ion secondary battery having both high energy density and an excellent charge-rate characteristic, there is provided a lithium ion secondary battery including a positive electrode containing a positive electrode active material made of a lithium composite oxide, and nano-carbon having a Li ion diffusion path as an additive, and an electrolyte solution containing 0.5 mol/l or more of Li[(FSO2)2N] as an electrolyte, LiPO2F2 as an additive, and a ternary-system of ethylene carbonate (EC), dimethyl carbonate (DMC) and ethyl methyl carbonate (EMC), as solvents.

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：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：US20200350584A1

公开(公告)日：2020-11-05

申请号：US16934111

申请日：2020-07-21

Applicant: NEC CORPORATION

Inventor： Qian CHENG ,  Noriyuki TAMURA

IPC: H01M4/587 ,  C01B32/05 ,  H01M10/052 ,  C01B32/318 ,  H01M4/133 ,  H01M10/0525

Abstract: An anode material for a lithium ion secondary battery that is obtainable by a method comprising: preparing a raw material of the anode material selected from high oxygen containing carbons, heat treating the raw material at a temperature of 550° C. to 850° C. under oxidizing atmosphere to form having a multi-channel carbon material and doping boron into the multi-channel carbon material.

公开(公告)号：US20190312306A1

公开(公告)日：2019-10-10

申请号：US16307657

申请日：2017-06-13

Applicant: NEC Corporation

Inventor： Noriyuki TAMURA ,  Katsumi MAEDA ,  Qian CHENG

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

Abstract: In order to provide a lithium ion secondary battery having both high energy density and an excellent charging-rate characteristic, in the lithium ion secondary battery comprising a positive electrode, a negative electrode and an electrolyte solution, the electrolyte solution comprises 0.5 mol/l or more of Li[(FSO2)2N], 0.5 mol/l or more of LiPF6, and LiPO2F2; and the negative electrode comprises graphite deposited with amorphous carbon or graphite coated with amorphous carbon and having a specific surface area of 4 m2/g or less, as a negative electrode active material.

公开(公告)号：US20190305317A1

公开(公告)日：2019-10-03

申请号：US16339853

申请日：2016-10-06

Applicant: NEC CORPORATION

Inventor： Qian CHENG ,  Katsumi MAEDA ,  Noriyuki TAMURA

IPC: H01M4/62 ,  H01M10/0525 ,  H01M10/0568 ,  H01M4/66 ,  H01M10/0569 ,  H01M10/0567

Abstract: The object of the invention is to provide a new lithium ion battery system that can have both high energy density and fast chargeable capability. The invention provides a lithium ion battery, comprising an anode comprising an anode active material layer on an anode current collector, the anode active material layer having a mass load higher than 60 g/m2, a cathode comprising a cathode active material layer on a cathode current collector, the cathode active material layer having a mass load higher than 100 g/m2, and an electrolytic solution comprising an imide anion based lithium salt and LiPO2F2, wherein at least one of the anode and cathode active material layers comprises a spacer composed of a hard carbon.

公开(公告)号：US20180083281A1

公开(公告)日：2018-03-22

申请号：US15561379

申请日：2015-03-27

Applicant: NEC CORPORATION

Inventor： Qian CHENG ,  Noriyuki TAMURA

IPC: H01M4/587 ,  H01M4/133 ,  H01M10/0525 ,  C01B32/05

CPC classification number: H01M4/587 ,  C01B32/05 ,  C01B32/20 ,  C01B32/30 ,  C01P2002/54 ,  C01P2002/78 ,  C01P2004/03 ,  C01P2004/61 ,  C01P2004/80 ,  C01P2006/40 ,  H01M4/133 ,  H01M10/052 ,  H01M10/0525 ,  H01M2004/021 ,  H01M2004/027 ,  Y02T10/7011

Abstract: An anode material for a lithium ion secondary battery that is obtainable by a method comprising: preparing a raw material of the anode material selected from high oxygen containing carbons, heat treating the raw material at a temperature of 550° C. to 850° C. under oxidizing atmosphere to form having a multi-channel carbon material and doping boron into the multi-channel carbon material.

公开(公告)号：US20190181494A1

公开(公告)日：2019-06-13

申请号：US16321891

申请日：2017-07-14

Applicant: NEC CORPORATION

Inventor： Katsumi MAEDA ,  Qian CHENG

IPC: H01M10/0525 ,  H01M10/0567 ,  H01M10/0568 ,  H01M10/0569 ,  H01M4/525

Abstract: A nonaqueous electrolytic solution comprising a nonaqueous solvent, an electrolyte, lithium difluorophosphate, and a difluoroboron complex compound represented by general formula (1): wherein R1 and R2 each independently represent a substituted or unsubstituted alkyl group having one to six carbon atoms, a substituted or unsubstituted aryl group, a substituted or unsubstituted heteroaryl group, or a substituted or unsubstituted alkoxy group, and R3 represents a hydrogen atom, a substituted or unsubstituted aryl group, or a substituted or unsubstituted heteroaryl group, wherein the content of lithium bis(fluorosulfonyl)imide as the electrolyte is 0 to 80 mol % based on the total amount of moles of the electrolyte.

公开(公告)号：US20190006675A1

公开(公告)日：2019-01-03

申请号：US16069813

申请日：2016-01-13

Applicant: NEC CORPORATION ,  UNIVERSITY OF HYOGO

Inventor： Qian CHENG ,  Noriyuki TAMURA ,  Yoshiaki MATSUO

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

Abstract: An anode material for a lithium ion battery, comprising an oxygen-containing carbon where oxygen is in the form of functional groups, the oxygen being distributed gradient from the surface to the inside of the carbon, and the carbon having an interlayer space d002 larger than 0.3357 nm; and a porous graphene layer covering the oxygen-containing carbon, the graphene being in the form of monolayer or few-layer graphene.

公开(公告)号：US20170288224A1

公开(公告)日：2017-10-05

申请号：US15506813

申请日：2014-08-29

Applicant: NEC Corporation

Inventor： Qian CHENG ,  Noriyuki TAMURA ,  Kentaro NAKAHARA

IPC: H01M4/587 ,  H01M10/0525 ,  H01M4/133 ,  H01M4/38 ,  H01M4/36 ,  H01M4/1393

CPC classification number: H01M4/587 ,  C01B32/00 ,  C01B32/182 ,  C01B2204/22 ,  C01P2004/61 ,  H01M4/133 ,  H01M4/1393 ,  H01M4/364 ,  H01M4/38 ,  H01M10/052 ,  H01M10/0525 ,  H01M2004/027

Abstract: The present invention provides an anode material for a lithium-ion battery comprising a carbon particle having a particle size of 5 μm to 30 μm, and including defective portions on a surface of the carbon particle, the defective portions being holes or pores formed by anodic oxidation of the carbon particle.