Nickel electrode and alkali storage battery using the same

A storage battery, alkaline technology, applied in the field of alkaline storage batteries, can solve the problems of insufficient high capacity of alkaline storage batteries, reduced conductivity between powders, and reduced cycle life, etc., to improve charging efficiency, improve ion conductivity, improve The effect of cycle life

Inactive Publication Date: 2006-01-25
M&G ECO BATTERY INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

That is, the increase in the capacity of the above-mentioned alkaline storage battery is also insufficient.
[0017] Moreover, when only Co oxide is used for coating, the swelling caused by repeated charging and discharging will cause cracks, which will reduce the cycle life while reducing the conductivity between powders.

Method used

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  • Nickel electrode and alkali storage battery using the same
  • Nickel electrode and alkali storage battery using the same
  • Nickel electrode and alkali storage battery using the same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0071] (Example 1, Ti solid solution)

[0072] A ring-shaped nickel foil with a thickness of 30 μm is passed between molds (or between rollers) provided with conical unevenness and pressurized to produce a three-dimensional conductive electrode substrate with numerous microscopic hollow unevenness. All of the closest to the convex part (concave part) is the concave part (convex part), and the hollow of the concave part (convex part) is generally conical in diameter, with a diameter of 60 to 80 μm at the root and 35 to 45 μm at the tip. A flat plate mold is subjected to intensive processing to reduce the wall thickness of the latter, and most of the front ends are opened. The thickness of the conductive electrode substrate three-dimensionalized by the concavo-convex portion was set at 500 μm, which was about 100 μm thicker than the thickness of the final electrode. The pitch between protrusions and protrusions (or the pitch between recesses and recesses) is set to be 350 to 45...

Embodiment 2

[0076] (Example 2, Y solid solution)

[0077] In addition to using nickel oxide coated with cobalt oxide, that is, the nickel oxide contains about 2% by weight of Co and about 4% by weight of Zn in terms of Ni metal in a solid solution state, the above-mentioned cobalt oxide is in a solid solution state A powder material containing about 8% by weight of Ti in terms of Co metal and a particle size of 15 to 20 μm, instead of nickel oxide coated with cobalt oxide, that is, the nickel oxide contains about 2% by weight of Co and about 4% by weight of Zn, the above-mentioned cobalt oxide contains about 8% by weight of Ti in terms of Co metal in a solid solution state, and the above-mentioned cobalt oxide contains 6% by weight relative to the nickel oxide. A Ni / MH storage battery of Example 2 was obtained in the same manner as in Example 1 except for the active material powder which was a spherical powder having a diameter of approximately 15 μm.

Embodiment 3

[0078] (Example 3, Cd solid solution)

[0079] In addition to using nickel oxide coated with cobalt oxide, that is, the nickel oxide contains about 2% by weight of Co and about 4% by weight of Zn in terms of Ni metal in a solid solution state, the above-mentioned cobalt oxide is in a solid solution state A powder material containing about 8% by weight of Cd in terms of Co metal and having a particle size of 15 to 20 μm replaces nickel oxide coated with cobalt oxide, that is, the nickel oxide contains about 2% by weight of Co and about 4% by weight of Zn. The above-mentioned cobalt oxide contains about 8% by weight of Ti in terms of Co metal in a solid solution state, and the above-mentioned cobalt oxide contains about 6% by weight relative to the nickel oxide. The Ni / MH storage battery of Example 3 was obtained in the same manner as in Example 1 except that the active material powder was spherical powder with a diameter of about 15 μm.

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Abstract

The present invention provides an anode of excellent charge efficiency that can inhibit the generation of O2 even at the high temperature of the charging process and an alkaline battery that adopts the anode and has excellent battery capacity. The alkaline battery adopts the anode that contains nickel oxide as the main material and so on, and is characterized in that:(1) the nickel oxide is coated by cobalt oxide; (2) the nickel oxide is in solid solution state and at least contains elements that are chosen from Co, Zn, Mg, Mn, Ag and Al; (3) the cobalt oxide has elements of solid solution that are chosen from the elements which are symbolized by Ti, Y, Zn, Cd, Pb, Cr, Ag and Ln (wherein, Ln is one or mixture of lanthanide elements). The alkaline battery for power use, which can reach a high temperature when used and has significant high-speed discharging characteristics, in particular can inhibit the reduction of discharge capacity.

Description

technical field [0001] The present invention relates to an alkaline storage battery with improved high capacity, high power performance, reliability and especially high temperature charging efficiency using a nickel electrode mainly made of nickel oxide coated with cobalt oxide. Background technique [0002] Recently, in terms of small secondary batteries, there are mainly consumer applications requiring high capacity density and power applications requiring high-speed discharge characteristics, and the market development in both directions is remarkable. The main point of user use is small electronic equipment, but some of them are power equipment, etc., which require high-speed discharge characteristics. Examples of power applications include a power source for a hybrid electric vehicle (HEV), a battery for a power source for mobility such as an electric assist bicycle, and the like. [0003] As a secondary battery used in consumer applications or power applications requi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/30H01M4/32H01M4/02H01M4/52H01M10/34
CPCY02E60/124H01M4/32H01M2004/028H01M4/244H01M4/52H01M4/46H01M4/26H01M4/38H01M4/74H01M2004/021H01M4/366Y02E60/10H01M4/24H01M10/24
Inventor 松本功川野博志广嶋义光
Owner M&G ECO BATTERY INST
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