Toyota Jidosha Kabushiki Kaisha

Panasonic Ev Energy Co., Ltd.

Sumitomo Metal Mining Company, Ltd.

Kazuhiro Ohkawa

Hiroyuki Sakamoto

Nobuyasu Morishita

Noriyuki Fujioka

Tomoyoshi Ueki

Yutaka Oyama

Katsuya Kase

Shinichi Yuasa

Takuichi Arai

Ryuichi Kuzuo

Syuhei Oda

Toshifumi Ueda

Koichi Yokoyama

There are provided a positive electrode active material for an alkaline storage battery, a positive electrode for an alkaline storage battery, and an alkaline storage battery each of which has an excellent output characteristics and also has an excellent self-discharge characteristic and an excellent cycle lifetime characteristic. The positive electrode active material for an alkaline storage battery according to the present invention has nickel hydroxide particles each containing at least magnesium in a solid solution state and a cobalt compound layer coating the surface of each of the nickel hydroxide particles. Among them, the cobalt compound layer contains cobalt having an average valence of not less than 2.6 and not more than 3.0 and also contains sodium at a proportion of less than 0.10 wt % to the total weight of the cobalt compound layer. The positive electrode active material for an alkaline storage battery according to the present invention has a conductivity smaller than 1.0&#xd7;10S/cm in a state pressurized at 39.2 MPa.

Positive electrode active material for alkaline storage battery, positive electrode for alkaline storage battery, alkaline storage battery, and method for manufacturing positive electrode active material for alkaline storage battery

Disclosed is a nonaqueous secondary battery () comprising a positive electrode () having a positive current collector () made of a metal, and a positive electrode active material () composed of a lithium-metal complex oxide. The surface of the positive electrode active material () is coated with a lithium salt () having an average thickness of 20-50 nm.

Coated positive electrode active material, positive electrode for nonaqueous secondary battery, nonaqueous secondary battery, and their production methods

A battery is adapted such that a nickel hydroxide particle group constituted of a number of nickel hydroxide particles filled in a void part of a positive electrode substrate contains, at a ratio of 15 wt % or less, small-diameter nickel hydroxide particles each having a particle diameter of 5 &#x3bc;m or less. The positive electrode substrate is configured such that a front-surface-side nickel layer and a back-surface-side nickel layer are made larger in thickness than a middle nickel layer, and an average thickness B of either the front-surface-side nickel layer or the back-surface-side nickel layer, which is thicker one, and an average thickness C of the middle nickel layer satisfy a relation of C/B&#x2267;0.6.

Battery

To provide a method of controlling charge and discharge of a secondary battery for automatic guided vehicle that can decide the timing of refresh charge and discharge accurately and minimize the frequency of refresh charge and discharge. The method of controlling charge and discharge of a secondary battery for automatic guided vehicle comprises a first discharge step of making the secondary battery drive an automatic guided vehicle and discharge electricity with a predetermined amount; a voltage measurement step of measuring a discharge end voltage of the secondary battery at the completion of the first discharge step; and a charge step of performing a first charge step of charging the secondary battery incompletely at a first charging current value when the discharge end voltage is higher than a preset minimum voltage, and performing a second charge step of discharging the secondary battery fully and then charging the secondary battery fully at a second charging current value smaller than the first charging current value when the discharge end voltage equals the preset minimum voltage or less.

Method of controlling charge and discharge of secondary battery for automatic guided vehicle

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Kosai, Japan

Kazuhiro Ohkawa