Matsushita Electric Industrial Co., Ltd.

Toyota Jidosha Kabushiki Kaisha

Panasonic Corporation

The Nippon Synthetic Chemical Industry Co., Ltd.

Matsushita Electronics Corporation

Other

Panasonic Intellectual Property Management Co., Ltd.

Mitsubishi Chemical Corporation

Toyo Tire & Rubber Co., Ltd.

Panasonic Holdings Corporation

Japan Tobacco Inc.

Sumitomo Chemical Company, Limited

Ihi Corporation

Kaoru Inoue

Katsunori Nishii

Yoshito Ikeda

Toshinobu Matsuno

Hiroyuki Masato

Yutaka Hirose

Ryosuke Ohsawa

Masato Fujikawa

Mikinari Shimada

Yusuke Fukumoto

Hideki Sano

Akira Tsujiko

Kohei Suzuki

Akihiro Taniguchi

Takayuki Shirane

Daisuke Ueda

Masaya Ugaji

Hideaki Fujita

Kiyomi Kato

Hizuru Koshina

Mitsuo Shibutani

Tetsuya Hayashi

Takeshi Fukuda

Takashi Hirose

Yukiyoshi Ueno

Shigeo Ikuta

Keisuke Ohara

Norihito Sakai

Hiroki Iguchi

Masaki Kitagawa

Hiroshi Seyanagi

Masaya Okochi

Tsuyoshi Tanaka

Tatsuya Hashimoto

Koichi A Ono

Yasuhiro Uemoto

Shusaku Goto

Yukihiro Okada

Hiroya Umeyama

Hiroyuki Sakai

Takashi Takeuchi

Mitsuru Tanabe

Kazuyuki Ogawa

Koji Torita

Takamasa Moriyama

Tomohiro Murata

Kouhei Tsuzuki

Atsushi Nakagawa

Takashi Masui

Toyoji Sugimoto

Satoshi Ishikawa

Makoto Sato

Hiroshi Yoshizawa

Kazuaki Takahashi

Manabu Yanagihara

Suguru Fujita

Kiyoshi Morimoto

Harunari Shimamura

Shinji Odanaka

Morikazu Sagawa

Keiichi Takahashi

Shin Hashimoto

Toshitada Sato

Yoshiaki Nitta

Takashi Hirao

Yoshiyuki Muraoka

Masaaki Niwa

Yorito Ota

Tadayoshi Nakatsuka

Yuichi Takahashi

Takayuki Yoshida

Yoshihiko Hirai

Kenji Okada

Hiromasa Fujimoto

Yoshiharu Anda

Susumu Kanzaki

Junko Ohira

Tomoyuki Mizuno

Juro Yasui

Takafumi Oura

Hideyuki Saka

Naoto Onodera

Katsumi Kashiwagi

Yasuaki Terui

Nobuaki Sato

Kozo Watanabe

Toshio Sugawa

Kunimitsu Yamamoto

Hideki Yagita

Akira Nagasaki

Yasuhiro Hirano

Takeo Tsutsumi

Nozomi Tanaka

Kazutoshi Tsuji

Ryoichi Tanaka

Yutaka Kawatate

Shigetoshi Takayanagi

Kazuhisa Fujimoto

Atsuo Wada

A secondary battery module includes a nonaqueous-electrolyte secondary battery and an elastic body, wherein a negative electrode constituting the nonaqueous-electrolyte secondary battery includes a negative-electrode active material layer, the negative-electrode active material layer includes a first layer, and a second layer that is formed on the first layer and has a higher compression modulus than the first layer, a separator constituting the nonaqueous-electrolyte secondary battery has a lower compression modulus than the first layer, the elastic body has a lower compression modulus than the separator, the graphite particles contained in the first layer have a BET specific surface area of 1 to 2.5 m/g, and the content of Si particles in the first layer is 6 mass % to 13 mass % relative to the total amount of the negative-electrode active material layer.

Nonaqueous-electrolyte secondary battery and secondary battery module

A secondary battery module according to the present embodiment includes a nonaqueous-electrolyte secondary battery and an elastic body, wherein a negative electrode constituting the nonaqueous-electrolyte secondary battery includes a negative-electrode current collector and a negative-electrode active material layer, the negative-electrode active material layer includes a first layer formed on the negative-electrode current collector, and a second layer that is formed on the first layer and has a higher compression modulus than the first layer, a separator constituting the nonaqueous-electrolyte secondary battery has a lower compression modulus than the first layer, the elastic body has a lower compression modulus than the separator, a graphite particles contained in the first layer have a BET specific surface area of 1 to 2.5 m/g, and the first layercontains 0.01 mass % to 0.4 mass % of a carbon nanotube having one to five graphene sheets.

A non-aqueous electrolyte secondary battery includes at least a positive electrode active material layer, a porous film, and a negative electrode active material layer. The negative electrode active material layer contains at least a graphite-based carbon material and silicon oxide. The porous film is interposed between the positive electrode active material layer and the negative electrode active material layer. The porous film contains at least a ceramic material. The negative electrode active material layer has a first spring constant. The porous film has a second spring constant. A ratio of the second spring constant to the first spring constant is higher than 1.

Non-aqueous electrolyte secondary battery

A negative electrode for a non-aqueous electrolyte secondary battery is provided. The negative electrode includes at least a negative electrode active material. The negative electrode active material includes a first type of silicon oxide particles and a second type of silicon oxide particles. The first type of silicon oxide particles has not been pre-doped with lithium. The second type of silicon oxide particles has been pre-doped with lithium. The first type of silicon oxide particles has a first average particle size. The second type of silicon oxide particles has a second average particle size. The ratio of the second average particle size to the first average particle size is not lower than 1.5 and not higher than 11.2.

Negative electrode, non-aqueous electrolyte secondary battery, and method of producing negative electrode

A negative electrode material contains composite particles. Each of the composite particles contains a negative electrode active material particle and a film. The negative electrode active material particle contains a silicon oxide phase and a lithium silicate phase. The film covers a surface of the negative electrode active material particle. The film contains an anion-exchange resin. To an ion-exchange group of the anion-exchange resin, a fluoride ion is bound. The content of the anion-exchange resin in the negative electrode material is not higher than 33 mass %.

Negative electrode material, non-aqueous electrolyte secondary battery, and method of producing the same

A first silicon oxide material and a second silicon oxide material are prepared. A dispersion is prepared by dispersing the first silicon oxide material in an aqueous carboxymethylcellulose solution. A negative electrode composite material slurry is prepared by dispersing the second silicon oxide material and a binder in the dispersion. A negative electrode is produced by applying the negative electrode composite material slurry to a surface of a negative electrode current collector and then performing drying. The binder includes no carboxymethylcellulose. The first silicon oxide material has not been pre-doped with lithium. The second silicon oxide material has been pre-doped with lithium.

Method of producing negative electrode, negative electrode, and non-aqueous electrolyte secondary battery

A lithium-ion secondary battery includes at least a negative electrode, a positive electrode, and an electrolyte solution. The negative electrode includes at least negative electrode active material particles. Each of the negative electrode active material particles contains at least a SiOparticle and a Si layer. The Si layer covers a surface of the SiOparticle. The Si layer has a thickness not smaller than 10 nm and not greater than 100 nm. The electrolyte solution contains at least one selected from the group consisting of FEC and VC.

Lithium-ion secondary battery and method of producing the same

A lithium-ion secondary battery includes at least a negative electrode, a positive electrode, and an electrolyte. The negative electrode includes at least a negative electrode active material and a polymer binder. The negative electrode active material includes at least a graphitic material and a silicon oxide material. The amount of acidic functional groups per unit surface area of graphitic material is not lower than 0.017 mmol/mand not higher than 0.086 mmol/m. A polymer binder contains a carboxy group. Polymer binder has a main chain with a length not smaller than 0.53 &#x3bc;m and not greater than 2.13 &#x3bc;m.

A non-aqueous electrolyte secondary battery includes at least a negative electrode composite material layer. The negative electrode composite material layer includes a negative electrode active material, a conductive material, and a binder. The negative electrode active material includes a silicon oxide material and a graphite material. The negative electrode composite material layer has a BET specific surface area not smaller than 3.5 m/g and not greater than 5.0 m/g. In an orthogonal coordinate system having an abscissa representing the elongation of the negative electrode composite material layer and an ordinate representing the electrical resistance of the negative electrode composite material layer, an elongation at a bending point (Cp) in the plot is 12% or higher.

Non-aqueous electrolyte secondary battery, method of evaluating negative electrode composite material layer, and method of producing non-aqueous electrolyte secondary battery

The positive electrode includes a positive electrode composite layer. The negative electrode includes a negative electrode composite material layer. A whole of the positive electrode composite layer and a portion of the negative electrode composite material layer face each other with the separator being interposed therebetween. The negative electrode composite material layer includes a first region and a second region. The first region is a region that does not face the positive electrode composite layer and that extends from a position facing one end portion of the positive electrode composite layer to a point separated from the position by more than or equal to 0.1 mm and less than or equal to 10 mm. The second region is a region other than the first region. The first region includes silicon oxide doped with lithium. The second region includes silicon oxide.

Lithium ion secondary battery and method for manufacturing lithium ion secondary battery

A negative electrode active material, a first carbon material, a thickener, and a solvent are mixed to prepare a first dispersion solution. The first dispersion solution and a second carbon material are mixed to prepare a second dispersion solution. The second dispersion solution and a binder are mixed to prepare a negative electrode paint. The negative electrode paint is applied to a surface of a negative electrode current collector and dried to produce a negative electrode for a nonaqueous electrolyte secondary battery. The negative electrode active material has a BET specific surface area of 3 m/g or more and 8 m/g or less. The first carbon material has a BET specific surface area of 30 m/g or more and 100 m/g or less. The second carbon material has a BET specific surface area of 200 m/g or more and 500 m/g or less.

Method of producing negative electrode for nonaqueous electrolyte secondary battery and method of producing nonaqueous electrolyte secondary battery

A non-aqueous electrolyte secondary battery includes a negative electrode, a positive electrode, and an electrolyte solution. The electrolyte solution contains at least one selected from the group consisting of ethylene carbonate, fluoroethylene carbonate, and vinylene carbonate. The negative electrode includes a negative electrode mixture layer. The negative electrode mixture layer contains a silicon-containing particle and a graphite particle. In a Log-differential pore volume distribution of the negative electrode mixture layer, the ratio of a Log-differential pore volume at a pore diameter of 2 &#x3bc;m to a Log-differential pore volume at a pore diameter of 0.2 &#x3bc;m is within a range of 10.5 to 33.1.

Non-aqueous electrolyte secondary battery and method of producing the same

An ethylene-vinyl alcohol copolymer resin composition pellet group is provided, which is excellent in long-run processability. The ethylene-vinyl alcohol copolymer resin composition pellet group is a group of pellets of an ethylene-vinyl alcohol copolymer resin composition containing an ethylene-vinyl alcohol copolymer and a divalent metal salt, wherein not greater than 3% of the pellets have a b*-value of not less than 5 after the pellets are heat-treated at 230&#xb0; C. for 30 minutes.

Group of pellets of ethylene-vinyl alcohol copolymer resin composition

A method of producing a lithium ion secondary battery includes preparing a case in which an electrode group including at least a positive electrode and a negative electrode is accommodated; impregnating a first electrolyte solution into the electrode group, lowering a potential of the negative electrode to a first potential, injecting FEC into a case, and lowering a potential of the negative electrode to a second potential. The negative electrode contains at least graphite and silicon oxide. The first electrolyte solution does not contain FEC. An additive has a reductive decomposition potential of 0.5 V (vs. Li/Li) or more and 1.5 V (vs. Li/Li) or less. The first potential is higher than 0.2 V (vs. Li/Li) and is equal to or lower than the reductive decomposition potential. The second potential is 0.2 V (vs. Li/Li) or less.

Method of producing lithium ion secondary battery

A nonaqueous electrolyte secondary battery includes a wound electrode assembly in which a positive electrode having, at its one end in a width direction, a positive electrode exposed portion provided without a positive electrode mixture layer on a positive electrode current collector and a negative electrode are wound together, with a separator interposed therebetween. The positive electrode exposed portion protrudes outward in an axial direction of the wound electrode assembly relative to the separator and the negative electrode at one end in the axial direction of the wound electrode assembly. The negative electrode exposed portion protrudes outward in the axial direction of the wound electrode assembly relative to the separator and the positive electrode at the other end in the axial direction. The positive electrode exposed portion has a cutout portion at least in an outermost circumferential portion of the positive electrode.

Nonaqueous electrolyte secondary battery and method of manufacturing the same

Growing community of inventors

Hirakata, Japan

Kaoru Inoue