Sony Corporation

Murata Manufacturing Co., Ltd.

Murata Manufacturingco., Ltd.

Sony Corpotation

Sony Corportion

Masayuki Iwama

Kenichi Kawase

Takakazu Hirose

Isamu Konishiike

Koichi Matsumoto

Yoshikazu Kato

Tomoo Takada

Nozomu Morita

Shunsuke Kurasawa

Akinori Kita

Takashi Fujinaga

Kotaro Satori

Rikako Imoto

Masayuki Ihara

Takaaki Matsui

Asuki Yanagihara

Masaharu Senoue

Shinji Hatake

Yuta Hirano

Taichi Kogure

Kazuki Honda

Yoshifumi Shimizu

Keitaro Kitada

Futoshi Sato

Motoki Endo

Aya Mashiko

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. A potential variation of the positive electrode is greater than or equal to 2 mV when the secondary battery is discharged from a full charge state by a capacity corresponding to 1% of a maximum discharge capacity. The maximum discharge capacity is a discharge capacity 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.

Secondary battery

There is provided a nonaqueous electrolyte battery including a first electrode having a strip shape, a second electrode having a strip shape, a first electrode lead, a second electrode lead, a separator having a strip shape that is disposed between the first electrode and the second electrode, and a nonaqueous electrolyte. A laminated electrode body, which is obtained by laminating the first electrode and the second electrode through the separator in such a manner that the second electrode lead is disposed at the other end portion of the second electrode not opposite to one end portion of the first electrode to which the first electrode lead is connected, is wound in a longitudinal direction with one end to which the first electrode lead is connected made as an initial end, and a wound electrode body is obtained.

Nonaqueous electrolyte battery

A secondary battery is provided. The secondary battery includes a positive electrode, a negative electrode including a carbon material and a silicon-based material; and an electrolyte layer. The electrolyte layer includes an electrolytic solution and a polymeric compound and has one or more through-holes extending in a thickness direction of the electrolyte layer.

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

A battery capable of improving the cycle characteristics is provided. The battery includes a cathode, an anode, and an electrolytic solution. The anode includes an anode active material layer containing an anode active material having silicon as an element, and a coating layer that coats the anode active material layer, and contains an oxide of a 3d transition metal element at least one selected from the group consisting of iron, cobalt, and nickel.

Anode and battery

A secondary battery includes a cathode, an anode, and a nonaqueous electrolytic solution. The anode contains a carbon material and silicon oxide, and a weight ratio (%) of the silicon oxide with respect to a total of the carbon material and the silicon oxide is within a range of 0.01% to 20% both inclusive. The nonaqueous electrolytic solution contains an unsaturated cyclic carbonate ester.

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

An anode capable of preventing expansion of an anode active material layer and a battery using it are provided. The anode includes an anode current collector, and an anode active material layer containing silicon (Si) as an element, wherein the anode active material layer therein contains at least one selected from the group consisting of a fluoride of an alkali metal and a fluoride of an alkali earth metal.

A current collector including a first principal plane and a second principal plane with a roughness of a first principal plane and a roughness of a second principal plane being mutually different.

Current collector, negative electrode and battery

A battery capable of improving cycle characteristics is provided. An anode includes: an anode current collector, and an anode active material layer arranged on the anode current collector, in which the anode active material layer includes an anode active material including silicon (Si), and including a pore group with a diameter ranging from 3 nm to 50 nm both inclusive, and the volumetric capacity per unit weight of silicon of the pore group with a diameter ranging from 3 nm to 50 nm both inclusive is 0.2 cm/g or less, the volumetric capacity being measured by mercury porosimetry using a mercury porosimeter.

Anode and secondary battery with anode material with pore group with low volumetric capacity

A current collector including a first principal plane and a second principal plane. In the current collector, the roughness of the first principal plane and second principal plane being mutually different.

A current collector forming an electrode for battery is provided. The electrode current collector includes a conductive layer made of copper or a copper alloy. Furthermore, the conductive layer has a plurality of crystallites, the crystallites containing crystallites having a cross-section area of 20 &#x3bc;mor more.

Electrode current collector and method for producing the same, electrode for battery and method for producing the same, and secondary battery

A current collector includes a first principal plane and a second principal plane. In the current collector, the roughness of the first principal plane and second principal plane being mutually different.

A lithium-ion secondary battery allowed to improve cycle characteristics and initial charge-discharge characteristics is provided. The lithium-ion secondary battery includes a cathode; an anode; and an electrolytic solution. The anode includes an anode active material layer including a plurality of anode active material particles. The anode active material particles each include a core section and a coating section applied to a part or a whole of a surface of the core section, and the core section includes a silicon-based material (SiO: 0&#x2266;x&#x3c;0.5) and the coating section includes an amorphous or low-crystalline silicon-based material (SiO: 0.5&#x2266;y&#x2266;1.8).

Lithium-ion secondary battery, anode for lithium-ion secondary battery, power tool, electric vehicle and energy storage system

An anode capable of relaxing the stress due to expansion and shrinkage and a battery using the anode are provided. In the anode, an anode active material layer containing at least one of silicon and tin as an element is provided on both faces of a strip-shaped anode current collector. In the anode current collector and the anode active material layer, at least one penetrating portion that is cut out or slit to penetrate the anode current collector and the anode active material layer is formed to extend to include a longitudinal component of the anode current collector.

Growing community of inventors

Fukushima, Japan

Masayuki Iwama