Murata Manufacturing Co., Ltd.

Murata Manufacturingco., Ltd.

Naoko Yamakawa

Takaaki Matsui

Taichi Kogure

Kazuki Honda

Moriaki Okuno

Shinji Hatake

Yuta Hirano

Keitaro Kitada

Futoshi Sato

Takashi Kokubun

Takashi Sato

Taichi Katsumoto

Masahiro Miyamoto

Yoshifumi Shimizu

Masumi Fukuda

Takuma Kawahara

Aya Mashiko

Aya Hashimoto

Yoshimi Tokuhara

Hiroto Asano

A secondary battery includes a positive electrode, a negative electrode, and an electrolytic solution. The positive electrode includes a positive electrode active material layer including a lithium-cobalt composite oxide. The lithium-cobalt composite oxide has a layered rock-salt crystal structure. The negative electrode includes a negative electrode active material layer including graphite. When the secondary battery is charged and discharged with an upper limit of a closed circuit voltage being set to 4.42 V or higher, a unit capacity (mAh/g) satisfies a condition represented by 168 mAh/g≤unit capacity (mAh/g)≤(−0.28×area rate (%)+178) mAh/g.

Secondary battery

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 includes a positive electrode having a first strip shape and a positive electrode lead, and a negative electrode having a second strip shape and a negative electrode lead. First ends of the positive electrode and the negative electrode in a longitudinal direction are on an inner peripheral side, and second ends of the positive electrode and the negative electrode in the longitudinal direction are on an outer peripheral side. The positive electrode lead and the negative electrode lead are extended out from a first end side in a width direction of the positive electrode and the negative electrode, and a first thickness of the positive electrode on the first end side is thinner than a second thickness of the positive electrode on a second end side in the width direction.

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

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 secondary battery includes a cathode terminal; an anode terminal; a wound electrode body; and a step reducing member. The step reducing member is attached to one or both of a first cathode wound portion and a first anode wound portion in one or more of a first region, a second region and a third region. The first region is in a major axis direction outside the cathode terminal in a wound direction of a cathode, and the second region is in the major axis direction outside the anode terminal in the wound direction of an anode and the third region between the cathode terminal and the anode terminal.

Secondary battery, battery pack, electric vehicle, electric power storage system, electric tool, and electronic apparatus

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Kyoto, Japan

Naoko Yamakawa