Gs Yuasa International Ltd.

Akihiko Miyazaki

Sumio Mori

Tomonori Kako

Kenta Nakai

Taro Yamafuku

Masashi Takano

Takeshi Sasaki

Jun Nakamura

Shinsuke Yoshitake

Motoki Hoshino

Shota Ito

Minoru Teshima

Ukyo Harinaga

Kenta Ogi

Kei Kumabayashi

Masakazu Tsutsumi

Kazuki Kawaguchi

Masaki Masuda

Fumiya Nakano

Ryosuke Shimokawa

Masakazu Tstsumi

One aspect of the present invention is an energy storage device including a negative electrode including a negative electrode substrate and a negative active material layer stacked directly or indirectly on at least one surface of the negative electrode substrate, the negative active material layer containing a negative active material, the negative active material containing hollow graphite particles having a median diameter Dand solid graphite particles having a median diameter Dsmaller than the median diameter of the hollow graphite particles.

Energy storage device

An aspect of the present invention is an energy storage device including an electrode assembly that has a negative electrode and a positive electrode, where the negative electrode contains a negative electrode substrate and a negative active material, and has a negative active material layer disposed in an unpressed shape along at least one surface of the negative electrode substrate, the negative active material includes solid graphite particles as a main component, and the solid graphite particles have an aspect ratio of 1 or more and 5 or less.

Energy storage device and method for manufacturing energy storage device

The present embodiment provides a lithium ion secondary battery including a positive electrode containing LiNiCoMO(0.9&#x2264;a&#x2264;1.2, 0.3&#x2264;x&#x2264;0.8, 0.2&#x2264;y+z&#x2264;0.7, where M is a metal element other than Li, Ni, and Co) as a positive active material, and a negative electrode containing non-graphitic carbon as a negative active material. In this lithium ion secondary battery, at a portion where the positive electrode and the negative electrode face each other, a basis weight (P) of the positive active material and a basis weight (N) of the negative active material satisfy a relational expression of 0.65&#x2264;P/N&#x2264;1.05.

Lithium ion secondary battery

An energy storage device includes a negative electrode having a negative active material layer containing amorphous carbon as an active material, a curve attained by determining a rate of change (dQ/dV) in a potential (V) of the amorphous carbon in a discharge capacity (Q) of the amorphous carbon per unit quantity based on a result attained by measuring the potential (V) with respect to the discharge capacity (Q) and representing the rate of change (dQ/dV) with respect to the potential (V) has one or more peaks in a range in which the potential of the amorphous carbon is 0.8 V or more and 1.5 V or less, and a potential of the negative electrode at time of full charge is 0.25 V or more with respect to a lithium potential.

Energy storage device and energy storage apparatus

An energy storage device includes a positive electrode provided with a positive composite layer containing a positive active material, a negative electrode provided with a negative composite layer containing a negative active material, and a separator partitioning between the positive electrode and the negative electrode, wherein the separator includes a substrate uniaxially drawn into a sheet shape and a coating layer coating at least one of surfaces of the substrate, and the coating layer has an anisotropic structure with orientation in a direction different from a drawing direction of the substrate.

Energy storage device and method of producing energy storage device

An energy storage device includes: a positive electrode plate containing a positive composite layer including a positive active material capable of occluding and releasing a lithium ion; and a negative electrode plate containing a negative composite layer including a negative active material capable of occluding and releasing a lithium ion. A peak pore diameter Rp of the positive composite layer in a pore distribution measured by a mercury penetration method is 0.5 &#x3bc;m or less, and a peak pore diameter Rn of the negative composite layer in a pore distribution measured by a mercury penetration method is 0.5 &#x3bc;m or less. A ratio Rp/Rn of the peak pore diameter of the positive composite layer to the peak pore diameter of the negative composite layer is 0.60 or more and 1.70 or less.

There is provided is an energy storage device having improved power performance at a relatively large current. In the present embodiment, an energy storage device is provided, which has a negative active material layer containing particulate amorphous carbon, wherein a distribution curve of differential pore volume in the negative active material layer has a peak appearing within the range from 0.1 &#x3bc;m to 2 &#x3bc;m inclusive and the differential pore volume at the peak is 0.9 cm/g or more.

Energy storage device and method for producing same

An energy storage device includes: an electrode assembly which includes: an approximately rectangular positive electrode; an approximately rectangular negative electrode which is stacked alternately with the positive electrode; and a strip-like elongated separator having a base material layer and an inorganic layer which is made to overlap with the first base material layer, wherein the elongated separator is arranged between the positive electrode and the negative electrode, and the base material layer of the elongated separator faces the negative electrode in an opposed manner between the positive electrode and the negative electrode.

An energy storage device is provided in which a decrease in power caused by repetitive charge-discharge in a high-temperature environment is suppressed. In the present embodiment, an energy storage device and a method for manufacturing the energy storage device are provided, the energy storage device including an electrode which includes: an active material layer including a particulate active material; and a conductive layer layered on the active material layer and including a conduction aid. An average secondary particle diameter of the active material is 2.5 &#x3bc;m or more and 6.0 &#x3bc;m or less. A surface roughness Ra of the conductive layer on a side on the active material layer is 0.17 &#x3bc;m or more and 0.50 &#x3bc;m or less.

Energy storage device and method for manufacturing same

An energy storage device includes: a core; and a wound body including, layered and wound around the core: a positive electrode, a negative electrode, and two separators, one of which is interposed between the positive electrode and the negative electrode and each having a first surface and a second surface. The first surface has thermal bonding properties superior to thermal bonding properties of the second surface, and at least one of the two separators is bonded to the core via the first surface thereof.

Energy storage device, winding apparatus, and winding method

An energy storage device includes a positive electrode and a negative electrode. The negative electrode includes graphite and non-graphitizable carbon, and a D50 particle size of the graphite at which a cumulative volume in a particle size distribution of a particle size reaches 50% is 2 &#x3bc;m or more. A ratio of a mass of the non-graphitizable carbon to a total amount of a mass of the graphite and a mass of the non-graphitizable carbon is 5% by mass or more and 45% by mass or less and a ratio of the D50 particle size of the graphite to a D50 particle size of the non-graphitizable carbon is 1.02 or less.

An energy storage unit having plural energy storage devices, each of which includes a container housing an electrode assembly and positive and negative electrode terminals electrically connected to the electrode assembly and extending from the container in the same direction, includes: a bus bar electrically connecting a first terminal, which is one of the positive electrode terminal and the negative electrode terminal of a first energy storage device included in the plural energy storage devices, and a second terminal, which is one of the positive electrode terminal and the negative electrode terminal of a second energy storage device included in the plural energy storage devices and opposite in polarity to the first terminal; a packing member interposed between the first terminal and the container of the first energy storage device; and an insulating member interposed between the bus bar and the container of the first energy storage device.

Energy storage unit

An energy storage device includes a positive electrode, a negative electrode, and an insulating layer arranged between these electrodes to electrically insulate these electrodes. The negative electrode includes a composite layer containing active material particles. The composite layer of the negative electrode, and the positive electrode are arranged to face each other across the insulating layer. The insulating layer contains electrically insulating particles, and is made porous by a gap between these particles. The composite layer of the negative electrode is made porous by a gap between the active material particles, and '&#x2212;0.8&#x2266;Log B&#x2212;Log A&#x2266;1.0' is satisfied in which in a pore distribution of the composite layer, a pore peak diameter is represented by A (&#x3bc;m), and in a pore distribution of the insulating layer, a peak diameter is represented by B (&#x3bc;m).

An energy storage device includes a positive electrode, a negative electrode, and a nonaqueous electrolyte solution. The negative electrode includes an active material layer, and the active material layer has pores having a pore size of 0.1 &#x3bc;m or more and 1.0 &#x3bc;m or less, and a total volume of the pores is 0.26 cm/g or more and 0.46 cm/g or less.

Provided is an energy storage device including an electrolyte solution including a compound represented by the general formula (1), a compound represented by the general formula (2), and a compound represented by the general formula (3): 

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Kyoto, Japan

Akihiko Miyazaki