公开(公告)号：US20210249649A1

公开(公告)日：2021-08-12

申请号：US17271348

申请日：2019-02-25

Applicant: Panasonic Intellectual Property Management Co., Ltd.

Inventor： Yasunori Baba ,  Masanori Sugimori ,  Katsunori Yanagida ,  Nobuhiro Hirano

IPC: H01M4/36 ,  H01M4/62 ,  H01M50/431 ,  H01M4/76

Abstract: In a nonaqueous electrolyte secondary battery a separator includes a porous substrate, a first filler layer, and a second filler layer. The first filler layer comprises phosphate particles having a BET specific surface area of 5 to 100 m2/g and polyvinylidene fluoride and is formed on a first surface that faces the positive electrode side of the substrate and contacts the positive electrode. The second filler comprises inorganic particles which have a melting point higher than that of the phosphate particles and is formed on at least one of a second surface that faces the negative electrode side of the substrate and the area between the substrate and the first filler layer. The content of the polyvinylidene fluoride in the first filler layer is 10 to 50 mass % and is higher in a region on the positive electrode side than in a region on the substrate side.

公开(公告)号：US11005090B2

公开(公告)日：2021-05-11

申请号：US16466126

申请日：2017-12-04

Applicant: Panasonic Intellectual Property Management Co., Ltd.

Inventor： Kouhei Tuduki ,  Takashi Ko ,  Fumiharu Niina ,  Katsunori Yanagida

IPC: H01M4/133 ,  H01M4/62 ,  H01M10/0525 ,  H01M4/02

Abstract: This non-aqueous electrolyte secondary battery is provided with: a wound electrode body which comprises a positive electrode, a negative electrode and a separator, and wherein the positive electrode and the negative electrode are wound into a roll, with the separator being interposed therebetween; and a non-aqueous electrolyte. The negative electrode comprises a negative electrode collector and a negative electrode mixture layer that is formed on the negative electrode collector. The negative electrode mixture layer contains graphite, a carbon material that has a BET specific surface area of 10 m2/g or more, said BET specific surface area being larger than that of the graphite, and a hydrophobic binder. The coverage of the particle surfaces of the carbon material by the binder is higher than the coverage of the particle surfaces of the graphite by the binder.

公开(公告)号：US10930968B2

公开(公告)日：2021-02-23

申请号：US16074654

申请日：2017-02-20

Applicant: Panasonic Intellectual Property Management Co., Ltd.

Inventor： Akihiko Takada ,  Fumiharu Niina ,  Katsunori Yanagida

IPC: H01M10/0525 ,  H01M10/04 ,  H01M10/0566 ,  H01M4/525 ,  H01M4/505 ,  H01M4/62 ,  H01M10/0567 ,  H01M4/485

Abstract: In a nonaqueous electrolyte secondary battery, a positive electrode contains a lithium transition metal oxide and a phosphoric acid compound. A nonaqueous electrolyte contains a dinitrile represented by a general formula: NC-A-CN (A represents a linear hydrocarbon having 1 to 10 carbon atoms or a hydrocarbon which contains a main chain having 1 to 10 carbon atoms and at least one side chain having 3 or less carbon atoms); an ether represented by a general formula: R1—O—R2—O—R3 (R1 and R3 each represent a group which contains a main chain having 1 to 3 carbon atoms, and R2 represents a chain hydrocarbon group having 1 to 3 carbon atoms); and a fluorophosphate salt.

公开(公告)号：US20200067074A1

公开(公告)日：2020-02-27

申请号：US16466126

申请日：2017-12-04

Applicant: Panasonic Intellectual Property Management Co., Ltd.

Inventor： Kouhei Tuduki ,  Takashi Ko ,  Fumiharu Niina ,  Katsunori Yanagida

IPC: H01M4/133 ,  H01M10/0525 ,  H01M4/62

Abstract: This non-aqueous electrolyte secondary battery is provided with: a wound electrode body which comprises a positive electrode, a negative electrode and a separator, and wherein the positive electrode and the negative electrode are wound into a roll, with the separator being interposed therebetween; and a non-aqueous electrolyte. The negative electrode comprises a negative electrode collector and a negative electrode mixture layer that is formed on the negative electrode collector. The negative electrode mixture layer contains graphite, a carbon material that has a BET specific surface area of 10 m2/g or more, said BET specific surface area being larger than that of the graphite, and a hydrophobic binder. The coverage of the particle surfaces of the carbon material by the binder is higher than the coverage of the particle surfaces of the graphite by the binder.

公开(公告)号：US20200014023A1

公开(公告)日：2020-01-09

申请号：US16483837

申请日：2018-01-26

Applicant: Panasonic Intellectual Property Management Co., Ltd.

Inventor： Takashi Ko ,  Fumiharu Niina ,  Katsunori Yanagida ,  Yasunori Baba ,  Yuki Morikawa

IPC: H01M4/133 ,  H01M4/131 ,  H01M10/0525 ,  H01M4/505 ,  H01M4/525 ,  H01M4/583

Abstract: A nonaqueous electrolyte secondary battery in which low-crystalline carbon-covered graphite is used as a negative electrode active material, wherein a cobalt-containing lithium transitional metal oxide is used for: a first positive electrode active material in which the volume per unit mass of pores having a pore size of 100 nm or less is 8 mm3/g or greater; and a second positive electrode active material in which the volume per unit mass of pores having a pore size of 100 nm or less is 5 mm3/g or less.

公开(公告)号：US20190305291A1

公开(公告)日：2019-10-03

申请号：US16471134

申请日：2017-12-11

Applicant: Panasonic Intellectual Property Management Co., Ltd.

Inventor： Yuki Morikawa ,  Yasunori Baba ,  Takashi Ko ,  Fumiharu Niina ,  Katsunori Yanagida

IPC: H01M4/131 ,  H01M10/0525 ,  H01M4/133 ,  H01M4/525 ,  H01M4/587 ,  H01M4/505

Abstract: A non-aqueous electrolyte secondary battery which uses a lithium titanium composite oxide as a negative electrode active material is configured to use a first positive electrode active material that is a Co-containing lithium transition metal oxide and has a volume per mass of 8 mm3/g or more with respect to pores having a pore diameter of 100 nm or less and a second positive electrode active material that has a volume per mass of 5 mm3/g or less with respect to pores having a pore diameter of 100 nm or less.

公开(公告)号：US20190245200A1

公开(公告)日：2019-08-08

申请号：US16343227

申请日：2017-10-19

Applicant: Panasonic Intellectual Property Management Co., Ltd.

Inventor： Yasunori Baba ,  Takashi Ko ,  Fumiharu Niina ,  Katsunori Yanagida

IPC: H01M4/36 ,  H01M4/485 ,  H01M4/525 ,  H01M4/505 ,  H01M10/0525

CPC classification number: H01M4/364 ,  H01M4/131 ,  H01M4/36 ,  H01M4/485 ,  H01M4/505 ,  H01M4/525 ,  H01M10/0525 ,  H01M2004/021 ,  Y02E60/122 ,  Y02T10/7011

Abstract: The present invention relates to a non-aqueous electrolyte secondary cell comprising: a positive electrode having a positive electrode mixture layer that contains a first positive-electrode active material and a second positive-electrode active material; a negative electrode containing a lithium-titanium composite oxide as a negative-electrode active material; and a non-aqueous electrolyte. The volume per mass of pores in the first positive-electrode active material having a pore diameter of 100 nm or less is four or more times the volume per mass of pores in the second positive-electrode active material having a pore diameter of 100 nm or less. The content of the first positive-electrode active material is 30 mass % or less with respect to the total amount of the first positive-electrode active material and the second positive-electrode active material.

公开(公告)号：US20190214635A1

公开(公告)日：2019-07-11

申请号：US16325557

申请日：2017-08-22

Applicant: Panasonic Intellectual Property Management Co., Ltd.

Inventor： Masanori Sugimori ,  Yasunori Baba ,  Katsunori Yanagida

IPC: H01M4/36 ,  H01M4/485 ,  H01M4/60 ,  H01M4/62 ,  H01M4/131 ,  H01M10/0525

Abstract: A negative electrode for nonaqueous electrolyte secondary batteries includes a negative electrode current collector and a negative electrode mixture layer disposed on the negative electrode current collector, and the negative electrode mixture layer contains a negative electrode active material containing lithium titanate, a binder, and a (meth)acrylic acid-based polymer. The amount of the (meth)acrylic acid-based polymer in the negative electrode mixture layer is 10 mass % or less relative to the total amount of the (meth)acrylic acid-based polymer and the binder. The amount of the (meth)acrylic acid-based polymer in a portion of the negative electrode mixture layer that extends from the surface to the middle of the negative electrode mixture layer in the thickness direction (upper region) is 60 mass % or more relative to the total amount of the (meth)acrylic acid-based polymer.

公开(公告)号：US20190181423A1

公开(公告)日：2019-06-13

申请号：US16321900

申请日：2017-07-28

Applicant: Panasonic Intellectual Property Management Co., Ltd.

Inventor： Akihiko Takada ,  Sho Urata ,  Kouhei Tuduki ,  Fumiharu Niina ,  Katsunori Yanagida

IPC: H01M4/131 ,  H01M10/0525 ,  H01M4/133 ,  H01M4/1391 ,  H01M4/1393 ,  H01M4/36

Abstract: A nonaqueous electrolyte secondary battery according to an embodiment includes an electrode body, which is formed by winding a positive electrode and a negative electrode through a separator and then compressing into a flat shape, and a nonaqueous electrolyte. The positive electrode contains a lithium transition metal oxide which contains tungsten oxide adhering to the particle surfaces thereof. The negative electrode contains a negative electrode active material, which has particle surfaces coated with an amorphous carbon film, and at least one of polyacrylic acid and a salt thereof. The pressure acting in the thickness direction of the electrode body is 5×10−2 MPa or more.

公开(公告)号：US20180366724A1

公开(公告)日：2018-12-20

申请号：US15781759

申请日：2016-12-19

Applicant: PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO., LTD.

Inventor： Fumiharu Niina ,  Takashi Ko ,  Katsunori Yanagida

IPC: H01M4/36 ,  H01M10/0525 ,  H01M10/0568 ,  H01M4/525 ,  H01M4/505 ,  H01M4/58 ,  H01M4/587

Abstract: A nonaqueous electrolyte secondary battery includes a positive electrode, a negative electrode, and a nonaqueous electrolyte. The positive electrode contains a lithium transition metal oxide, at least one element of a group 5 element and group 6 element in the periodic table, and a phosphoric acid compound. The nonaqueous electrolyte contains a lithium salt containing a P—O bond and a P—F bond.