Sanyo Electric Co., Ltd.

Panasonic Corporation

Asahi Glass Company, Limited

Matsushita Electric Industrial Co., Ltd.

Panasonic Intellectual Property Management Co., Ltd.

Panosonic Corporation

Haruya Nakai

Yoshiyuki Muraoka

Masayuki Saito

Tetsuya Matsuda

Hiroyuki Usui

Masao Fukunaga

Hideki Kasahara

Ayumi Kochi

Yusuke Ozaki

Gota Asano

Toru Inagaki

Kazuya Nishio

Koichi Katayama

Ryosuke Shirota

Nobuyuki Kawaguchi

Tomitake Omori

Naoki Uchida

Takashi Ebihara

Hiroyuki Kannari

Takashi Ohkawa

Yoichiro Tsuji

Masaya Ugaji

Hiroshi Matsuyama

Kohji Yuasa

Masaharu Miyahisa

Akira Nagasaki

Hidemasa Kawai

Ryouichi Tanaka

Keisuke Ota

Takahiro Aoyama

Tohru Kawakatsu

Fumio Matsushita Electric Ind Co Ltd Iwahashi

A manufacturing method of a positive electrode plate for a non-aqueous electrolyte secondary battery includes a coating and drying step of coating a positive electrode active material layer and a protective layer onto a positive electrode core so that the protective layer forms a raised part between a portion inside a side end of a core exposed part in a width direction and a width-direction center, and then drying the positive electrode active material layer and the protective layer; and a compressing step of compressing the protective layer and the positive electrode active material layer so as to press the raised part formed in the coating and drying step and the positive electrode active material layer.

Method for producing positive electrode plate for nonaqueous electrolyte secondary battery and method for producing nonaqueous electrolyte secondary battery

A negative electrode includes a negative electrode protecting layer that is disposed so as to cover a negative electrode active material layer formed on at least one surface of a negative electrode core in a thickness direction and that has higher electrical resistance than the negative electrode active material layer. The negative electrode active material layer includes a first surface and a second surface. The first surface is formed in a region extending from an edge at one end to a boundary 300 &#x3bc;m away from the edge in a width direction. The second surface is positioned closer than the first surface to the other end. Regarding the negative electrode protecting layer, the average value of the first thickness of a first portion covering the first surface is 1.7 or more times larger than the maximum value of the second thickness of a second portion covering the second surface.

Electrode and nonaqueous electrolyte secondary battery

A positive electrode includes a positive electrode substrate and a positive electrode active material layer disposed on at least one surface of the positive electrode substrate. The positive electrode active material layer contains a positive electrode active material, a binder, and an electroconductive agent. The positive electrode active material layer contains, as the electroconductive agent, a string-shaped agglomerate formed of fibrous carbons gathered and entangled with each other. The agglomerate has a length of 30 &#x3bc;m or more.

Electrode of nonaqueous electrolyte secondary battery, nonaqueous electrolyte secondary battery, method for producing electrode, and method for producing nonaqueous electrolyte secondary battery

A nonaqueous electrolyte secondary battery includes a first electrode plate including a core plate and an active material layer including an active material and a binder, and disposed on a surface of the core plate; a second electrode plate; and a nonaqueous electrolyte. When the surface of the active material layer in contact with the core plate is taken as zero point, the amount of the binder in a 0%-10% thickness region X is 8.5 to 9.5 mass % of the total amount of the binder in the active material layer, the amount of the binder in a 90%-100% thickness region Y is 9.5 to 11.5 mass % of the total amount of the binder in the active material layer, and a binder-richest portion across the thickness of the active material layer resides in a 55%-100% thickness region across the thickness of the active material layer.

Nonaqueous electrolyte secondary batteries and methods for producing the same

A negative electrode active material slurry is applied to one surface of a strip-shaped negative electrode core so as to form multiple lines of the negative electrode active material slurry, the lines extending in an X direction and being spaced from each other in a Y direction. Subsequently, while keeping the negative electrode core aloft, first hot air is blown toward the negative electrode core from at least a lower side in a vertical direction, and then, while keeping the negative electrode core aloft, first cooling air having a lower temperature than the first hot air is blown toward the negative electrode core from at least the lower side in the vertical direction so as to decrease the temperature of the negative electrode core to 40&#xb0; C. or lower.

Methods for producing nonaqueous electrolyte secondary battery and electrode thereof

A nonaqueous electrolyte secondary battery according to an embodiment of the present disclosure includes a negative electrode including a negative electrode core and negative electrode mixture layers formed on both surfaces of the negative electrode core. Each of the negative electrode mixture layers contains a cellulose-based binder composed of at least one of carboxymethyl cellulose and a salt thereof. When each of the negative electrode mixture layers is divided in half, at the center in the thickness direction, into a first region near the negative electrode core and a second region far from the negative electrode core, the content of the cellulose-based binder present in the first region is 35% by mass or more and less than 50% by mass of the total mass of the cellulose-based binder contained in the entire of each of the negative electrode mixture layers.

Nonaqueous electrolyte secondary battery and method for producing nonaqueous electrolyte secondary battery

A nonaqueous electrolyte secondary battery includes a positive electrode plate having a positive electrode active material layer formed on a positive electrode core, a negative electrode plate having a negative electrode active material layer formed on a negative electrode core, and a flat-shape wound electrode body in which the positive electrode plate and the negative electrode plate are wound through a separator. Further, a protective layer is formed on the positive electrode active material layer or the negative electrode active material layer. The protective layer contains ceramic particles and a binder, and the average particle diameter (D50) and the average particle diameter (D90) of the ceramic particles are 1.0 &#x3bc;m to 1.8 &#x3bc;m and 3.0 &#x3bc;m to 5.0 &#x3bc;m, respectively.

Nonaqueous electrolyte secondary battery and production method therefor

Disclosed is a method for manufacturing a positive electrode including a positive electrode substrate made of aluminum foil and a positive electrode active material layer containing a positive electrode active material on the positive electrode substrate. This method includes the steps of forming the positive electrode active material layer on the positive electrode substrate; forming a protective layer on the positive electrode substrate; stretching an exposed region of the positive electrode substrate after the steps of forming the active material layer and the protective layer; and compressing the positive electrode active material layer after the stretching step.

Method for manufacturing electrode and method for manufacturing secondary battery

Disclosed is a method for manufacturing a positive electrode including a positive electrode substrate made of aluminum foil and a positive electrode active material layer containing a positive electrode active material on the positive electrode substrate. This method includes the steps of stretching a first exposed region of the positive electrode substrate with a first stretching roller disposed upstream; stretching a second exposed region of the positive electrode substrate with a second stretching roller disposed downstream; and compressing the positive electrode active material layer with a pair of compression rollers.

In a wound electrode group, a positive electrode includes positive electrode active material layers formed on both surfaces of a band-like positive electrode current collector, and a negative electrode includes negative electrode active material layers on both surfaces of a band-like negative electrode current collector. Charge capacity of the negative electrode falls within a range of 83-99% of theoretical capacity of the negative electrode in a full charge state of a nonaqueous electrolyte secondary battery. An active material mass M1 per unit area of a negative electrode active material layer formed on an outer circumference of the negative electrode current collector, and an active material mass M2 per unit area of a negative electrode active material layer formed on an inner circumference satisfy a relational expression of M1/M2&#x3c;(R1+t/2)/(R1&#x2212;t/2), where the electrode group has an innermost diameter of R1, and the negative electrode has a thickness of t.

Nonaqueous electrolyte secondary battery

A lithium ion secondary battery which includes: a power generation element including a positive electrode, a negative electrode, a separator interposed between the positive electrode and the negative electrode, and a non-aqueous electrolyte; a case accommodating the power generation element and having an opening; and a sealing plate sealing the opening of the case is charged. The sealing plate has an external terminal of the positive or negative electrode, and an internal terminal electrically connected to the positive or negative electrode. The external and internal terminals are connected to each other and have an electrical resistance therebetween of 0.1 to 2 m&#x3a9;. Two or more constant-current charging steps in each of which the secondary battery is charged at a constant charge current until a charge voltage reaches an end-of-charge voltage are performed. In the two or more constant-current charging steps, the secondary battery is subjected to constant-current charging at a current Ic() of 1 to 5 C until the charge voltage reaches a target voltage Ecs(). After the charge voltage reached the target voltage Ecs(), the secondary battery is subjected to constant-current charging at a current Ic(k) satisfying Ic(k)&#x3c;Ic() until the charge voltage reaches a target voltage Ecs(k) higher than the target voltage Ecs().

Lithium ion secondary battery charging method and battery pack

A discharge controller includes a secondary battery, a switch section for opening/closing a discharge path from the secondary battery to a load, a voltage detector for detecting a terminal voltage of the secondary battery, and a cut-off voltage control section for controlling the switch section to be opened when the terminal voltage as detected by the voltage detector is not more than a predetermined cut-off voltage of discharge V, while measuring an amount of decrease per unit time of the terminal voltage as detected by the voltage detector to set the cut-off voltage of discharge Vto a lower voltage, for a larger amount of decrease per unit time of the terminal voltage as detected by the voltage detector.

Discharge controller

An alkaline storage battery including a strip-shaped porous metal substrate and a material mixture filled into the substrate. The substrate has an unfilled portion where the material mixture is not filled along at least one of two longitudinal sides of the substrate. The substrate has a weight per unit area of 150 to 350 g/m. The material mixture contains an active material and an elastic polymer.

Method for producing positive electrode plate for alkaline storage battery

A positive electrode for an alkaline storage battery is disclosed, comprising a conductive base material and an active material layer attached to the base material, the active material layer comprising an active material and a binder, the binder comprising an elastic copolymer comprising one or more tetrafluoroethylene units and one or more propylene units.

Growing community of inventors

Hyogo, Japan

Haruya Nakai