Toyota Jidosha Kabushiki Kaisha

Kabushiki Kaisha Toyota Chuo Kenkyusho

Panasonic Holdings Corporation

Akira Tsujiko

Tomitaro Hara

Sachie Yuasa

Keiko Wasada

Takeshi Abe

Ryosuke Ohsawa

Kaoru Inoue

Yohei Shindo

Daisuke Teramoto

Takuichi Arai

Mamoru Mizutani

Hiroshi Sawada

Tsuyoshi Yano

Chikaaki Okuda

Ippei Goto

Osamu Hiruta

Yuichi Itou

Hideyasu Kawai

Takahito Imamine

Michiyuki Ide

Koji Takahata

Yoshihiro Iwano

Keiichi Takahashi

Akihiro Taniguchi

Morinobu Endo

Fumiharu Niina

Keisuke Ohara

Takashi Ko

Yasumasa Oguma

Natsumi Goto

Sho Tsuruta

Hiroki Iguchi

Ryo Hanazaki

Hideyuki Yamamura

Hironori Harada

Tsuyoshi Sasaki

Machiko Abe

Yuichi Ito

Keiichi Kohama

Mikio Kawakami

Youji Takeuchi

Akira Kohyama

Kohei Kintsu

Yuko Matsumura

Yong Jung Kim

Fuhito Kamata

Tomonori Kawamura

Disclosed is a non-aqueous electrolyte secondary battery positive electrode that includes a positive electrode core and a positive electrode mixture layer disposed on the positive electrode core. The positive electrode mixture layer contains a positive electrode active material and carbon nanotubes. The positive electrode active material contains a lithium transition metal composite oxide (I) that either comprises secondary particles that are aggregates of primary particles having an average particle size of 1 μm or greater, or is substantially composed of single particles, the lithium transition metal composite oxide (I) having a volume-based median diameter of 0.6 μm to 6 μm, and a lithium transition metal composite oxide (II) that comprises secondary particles that are aggregates of primary particles having an average particle size of less than 1 μm, the lithium transition metal composite oxide (II) having a volume-based median diameter of 3 μm to 25 μm.

Non-aqueous electrolyte secondary battery positive electrode and non-aqueous electrolyte secondary battery

Manufacturing a lithium-ion battery includes assembling the lithium-ion battery; and performing an initial charging on the lithium-ion battery. The lithium-ion battery includes a positive electrode, a negative electrode, and an electrolyte; the negative electrode contains a negative electrode active material containing a precursor of a silicon material, the precursor having a composition represented by SiOwhere a relationship of 0<x<2 is satisfied. The initial charging includes a first step where the charging is performed to an intermediate voltage at a first current rate, and a second step where the charging is performed from the intermediate voltage to a maximum voltage at a second current rate. The first current rate is lower than 0.5 C; the second current rate is higher than the first current rate; and the intermediate voltage is 3.75 V or higher.

Lithium-ion battery and method of manufacturing the same

A battery system includes a battery that is a lithium ion battery including an electrode assembly containing a positive electrode active material. An ECU calculates a deterioration index value &#x3a3;D corresponding a degree of progress of high rate deterioration, and when the deterioration index value &#x3a3;D exceeds a threshold value, controls a power converter or a PCU to cause a voltage of the battery to fall within a voltage range including a specific voltage. The specific voltage is a peak voltage on a dQ/dV voltage characteristic curve, the peak voltage being derived from structural change of the positive electrode active material. The dQ/dV voltage characteristic curve is a curve indicating a relationship between dQ/dV that is a ratio of a change dQ of a stored electricity amount to a change dV of the voltage of the battery, and the voltage of the battery.

Battery system and method for controlling lithium ion 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 method of producing a secondary battery disclosed here includes forming a positive electrode active material layer containing a lithium- and manganese-containing composite oxide on a positive electrode current collector to produce a positive electrode; measuring a peel strength between the positive electrode active material layer and the positive electrode current collector; producing a secondary battery assembly including the positive electrode, a negative electrode, and a nonaqueous electrolyte using the positive electrode; and initially charging the secondary battery assembly. When the secondary battery assembly is initially charged, a restraining pressure is determined based on the measured peel strength, and in a predetermined peel strength range, a higher restraining pressure is set for a secondary battery assembly including a positive electrode having a low peel strength than for a secondary battery assembly including a positive electrode having a large peel strength.

Method of producing secondary battery

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

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 nonaqueous electrolytic solution is a nonaqueous electrolytic solution for a lithium secondary battery, the lithium secondary battery including a positive electrode that includes a positive electrode active material, and a negative electrode that includes a negative electrode active material which is a carbonaceous material storing and releasing a lithium ion. The nonaqueous electrolytic solution includes: one or more anions selected from an oxalato borate anion and an oxalato phosphate anion; and one or more arylamine compounds. The nonaqueous electrolytic solution is present between the positive electrode and the negative electrode and conducts a lithium ion.

Nonaqueous electrolytic solution and lithium 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

The negative electrode plate includes at least a negative electrode composite material layer. The negative electrode composite material layer has a density of 1.5 g/cmor more. The negative electrode composite material layer contains at least first particles, second particles and a binder. The first particles contain graphite particles and an amorphous carbon material. The amorphous carbon material is coated on the surface of each graphite particle. The second particles are made of silicon oxide. The ratio of the second particles to the total amount of the first particles and the second particles is 2 mass % or more to 10 mass % or less. The negative electrode plate has a spring constant of 700 kN/mm or more to 3000 kN/mm or less.

Negative electrode plate and non-aqueous electrolyte secondary battery

A method of producing a secondary battery disclosed here includes forming a positive electrode active material layer containing a lithium- and manganese-containing composite oxide on a positive electrode current collector to produce a positive electrode; measuring a peel strength between the positive electrode active material layer and the positive electrode current collector; producing a secondary battery assembly including the positive electrode, a negative electrode, and a nonaqueous electrolyte using the positive electrode; and initially charging the secondary battery assembly. When the secondary battery assembly is initially charged, a charging rate is determined based on the measured peel strength, and in a predetermined peel strength range, a lower charging rate is set for a secondary battery assembly including a positive electrode having a low peel strength than for a secondary battery assembly including a positive electrode having a large peel strength.

A negative electrode active material particle has a composition represented by the following formula (I): SiOD. . . (I). In the formula (I), x satisfies 0&#x2264;x&#x2264;1.5. D is a group 13 element or a group 15 element in a periodic table. In an outermost surface of the negative electrode active material particle, y satisfies 10&#x2264;y&#x2264;10. In a center of the negative electrode active material particle, y satisfies y&#x2264;10.

Negative electrode active material particle, negative electrode, lithium ion secondary battery, and method of producing negative electrode active material particle

A manufacturing method for an all-solid-state battery includes: producing a laminated battery having both end surfaces in a lamination direction and a side surface by laminating pluralities of collector layers, positive electrode mixture layers, solid electrolyte layers, and negative electrode mixture layers; supplying a liquid resin to only the side surface of the laminated battery; and curing the liquid resin. Producing the laminated battery by protruding at least one layer of the collector layer, the positive electrode mixture layer, the solid electrolyte layer, and the negative electrode mixture layer relative to remaining of the layers to form a protruding layer. Protruding a plurality of protruding layers from the side surface of the battery. Supplying the resin involves supplying the liquid resin to only the side surface of the laminated battery such that the liquid resin penetrates into a clearance between one protruding layer and another protruding layer.

Manufacturing method for all-solid-state battery, manufacturing apparatus for all-solid-state battery, and all-solid-state battery

An all-solid-state battery system includes: an all-solid-state battery; a light detection unit; and a control unit. The all-solid-state battery includes a battery element having a positive electrode layer, a negative electrode layer and a solid electrolyte layer. The light detection unit detects light emitted from at least one of the positive electrode layer and the negative electrode layer. The control unit controls charge of the all-solid-state battery on the basis of intensity of light detected by the light detection unit.

All-solid-state battery system with charge control based on light detection

Growing community of inventors

Miyoshi, Japan

Akira Tsujiko