公开(公告)号：US20240128440A1

公开(公告)日：2024-04-18

申请号：US18277868

申请日：2022-01-24

Applicant: Panasonic Intellectual Property Management Co., Ltd.

Inventor： Nobuhiro Hirano ,  Yusuke Fukumoto ,  Masanori Sugimori ,  Yuji Yokoyama

IPC: H01M4/36 ,  H01M4/04 ,  H01M4/38 ,  H01M4/583 ,  H01M4/62 ,  H01M10/0525

CPC classification number: H01M4/364 ,  H01M4/0404 ,  H01M4/386 ,  H01M4/583 ,  H01M4/625 ,  H01M10/0525 ,  H01M2004/027

Abstract: This negative electrode for a lithium ion secondary battery is characterized by comprising a negative electrode mixture layer containing a carbon-based negative electrode active material, a Si-based negative electrode active material, and carbon nanotubes, wherein when 100 is the ratio at which the carbon nanotubes coat the surface of the Si-based negative electrode active material, the ratio at which the carbon nanotubes coat the surface of the carbon-based negative electrode active material is at least 20 but no higher than 50.

公开(公告)号：US20240055613A1

公开(公告)日：2024-02-15

申请号：US18267304

申请日：2021-11-26

Applicant: Panasonic Intellectual Property Management Co., Ltd.

Inventor： Yusuke Fukumoto ,  Nobuhiro Hirano ,  Masanori Sugimori ,  Yuji Yokoyama

IPC: H01M4/62 ,  C01B32/174 ,  C09D5/24 ,  C09D7/61 ,  C09D101/28 ,  H01M4/587 ,  H01M4/38 ,  H01M4/133 ,  H01M4/134 ,  H01M4/36

CPC classification number: H01M4/625 ,  C01B32/174 ,  C09D5/24 ,  C09D7/61 ,  C09D101/286 ,  H01M4/587 ,  H01M4/386 ,  H01M4/133 ,  H01M4/134 ,  H01M4/364 ,  C01B2202/22 ,  C01P2006/22 ,  C01B2202/28 ,  C01P2004/62 ,  C01P2004/61 ,  C01P2004/53

Abstract: Provided is an electrode slurry carbon nanotube liquid dispersion which improves charge/discharge cycle characteristics. An electrode slurry carbon nanotube liquid dispersion which is one aspect of the present disclosure and contains 0.1-1.5 mass % of carbon nanotubes, a dispersion medium, and carboxymethyl cellulose, the viscosity of which at 100 s−1 in a 3% aqueous solution is 2-200 mPa·s, wherein: the carboxymethyl cellulose content constitutes 50-250 parts by mass relative to 100 parts by mass of carbon nanotubes; the viscosity at 100 s−1 is 50-200 mPa·s in a state in which the carbon nanotubes are dispersed; and the particle distribution according to the laser diffraction method exhibits a D10 of 0.3-1.0 μm, a D50 of 3-10 μm and a D90 of 60 μm or less in a state in which the carbon nanotubes are dispersed.

公开(公告)号：US20240105958A1

公开(公告)日：2024-03-28

申请号：US18267234

申请日：2021-12-06

Applicant: Panasonic Intellectual Property Management Co., Ltd.

Inventor： Masanori Sugimori ,  Yusuke Fukumoto ,  Yuji Yokoyama ,  Nobuhiro Hirano

IPC: H01M4/62 ,  B82Y30/00 ,  H01M4/1393 ,  H01M4/38 ,  H01M10/0525

CPC classification number: H01M4/625 ,  B82Y30/00 ,  H01M4/1393 ,  H01M4/386 ,  H01M10/0525 ,  H01M2004/027

Abstract: Provided is a carbon nanotube dispersion liquid for an electrode slurry such that it is possible to inhibit a decrease in a charge-discharge cycle characteristic. A carbon nanotube dispersion liquid for an electrode slurry according to one aspect of the present disclosure includes carbon nanotubes having a diameter of 0.4 to 2 nm, a dispersant, and a dispersion medium. In a Raman spectroscopy spectrum, the carbon nanotubes have a G/D ratio, which is the ratio of the peak intensities of the G-band (1560 to 1600 cm−1) and the D-band (1310 to 1350 cm−1), within the range of 50 to 200, and in a volume-based particle size distribution via a laser diffraction method, the carbon nanotubes have 3 to 5 peaks, and if the peaks are, from the small particle diameter side, P1, P2, . . . , Pn, the greatest frequency peak is in the range pf P2 to Pn-1.