Murata Manufacturing Co., Ltd.

Sony Corporation

Moriaki Okuno

Yukio Miyaki

Yoshiichi Horikoshi

Taichi Katsumoto

Rie Watanabe

Takaaki Matsui

Taichi Kogure

Kazuki Honda

Naoko Yamakawa

Masahiro Miyamoto

Shinji Hatake

Yuta Hirano

Yoshifumi Shimizu

Keitaro Kitada

Toshitsugu Ono

Sho Takahashi

Futoshi Sato

Aya Mashiko

Aya Hashimoto

Yoshimi Tokuhara

Hiroto Asano

Shinji Hayazaki

Takuma Kawahara

Secondary battery

A secondary battery includes a power generation element including a plurality of electrodes. The electrodes are stacked on each other in a stacking direction with a separator interposed therebetween. Each of the electrodes includes a current collector led out in a first direction intersecting the stacking direction. Each of a plurality of current collectors led out in the first direction includes an end part, and the end part includes a first bent part that is bent in a second direction intersecting the first direction. Each of a plurality of first bent parts overlaps and is in contact with an adjacent first bent part in the second direction. At least one of the first bent parts terminates at a middle point on an end face along the second direction of the power generation element.

A secondary battery includes a positive electrode, a negative electrode, and an electrolytic solution. The positive electrode includes a lithium-cobalt composite oxide having a layered rock-salt crystal structure. The negative electrode includes graphite. An open circuit potential of the negative electrode measured in a full charge state is from 19 mV to 86 mV. A potential variation of the negative electrode is greater than or equal to 1 mV when the secondary battery is discharged from the full charge state by a capacity corresponding to 1% of a maximum discharge capacity. The maximum discharge capacity is obtained when the secondary battery is discharged with a constant current from the full charge state until the closed circuit voltage reaches 3.00 V, following which the secondary battery is discharged with a constant voltage of the closed circuit voltage of 3.00 V for 24 hours.

A battery is provided. The battery includes an electrode having a flat shape. The electrode is wound and includes a through hole. The through hole is further provided in a wound-back portion of the electrode.

Battery, battery pack, electronic device, electric vehicle, electric storage device, and electric power system

A separator includes a substrate layer that is porous, and a surface layer that is provided on at least one main face of the substrate layer and that has an uneven shape. The surface layer includes first particles that are for forming convexities of the uneven shape and that are a main component of the convexities, second particles that have a smaller average particle size than the first particles, cover at least a part of a surface of the first particles, and cover at least a part of a surface of the substrate layer that is exposed between the first particles, and a resin material.

Separator, nonaqueous electrolyte battery, battery pack, electronic device, electric vehicle, power storage device, and power system

A separator includes a substrate layer and a porous surface layer that is provided on at least one major surface of the substrate layer and contains a first particle, a second particle, and a resin material. The surface layer includes a first region configured by the first particle and a second region configured by the second particle and the resin material.

Separator, battery, battery pack, electronic apparatus, electric vehicle, electric storage device, and power system

A separator has: a substrate including a porous film; and a surface layer which is provided on at least one surface of the substrate, which includes a vinylidene fluoride-tetrafluoroethylene-hexafluoropropylene copolymer, and which has a plurality of minute pores.

Separator and nonaqueous electrolyte battery, and battery pack, electronic apparatus, electric vehicle, electric power storage device, and electric power system

Growing community of inventors

Kanagawa, Japan

Moriaki Okuno