Negative electrode for alkaline storage battery and alkaline storage battery

A storage battery and negative electrode technology, which is applied in the direction of alkaline storage battery electrodes, alkaline storage batteries, battery electrodes, etc., can solve the problems of alkaline storage battery cycle life decline, discharge capacity and discharge voltage drop, and easy cracks, etc., and achieve good storage characteristics , The effect of suppressing the decrease of discharge capacity and discharge voltage, and preventing the increase of internal impedance

CN101378121BActive Publication Date: 2013-07-24SANYO ELECTRIC CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Publication Date
2013-07-24

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Abstract

An alkaline storage battery has a positive electrode, a negative electrode utilizing hydrogen-absorbing alloy, and an alkaline electrolyte, and wherein the negative electrode contains a hydrogen-absorbing alloy represented by the general formula Ln1-xMgxNiy-a-bAlaMb, where Ln is at least an element selected from rare-earth elements including Y and Zr and Ti, M is at least one element selected from V, Nb, Ta, Cr, Mo, Mn, Fe, Co, Ga, Zn, Sn, In, Cu, Si, P and B, 0.05<=x<=0.30, 0.05<=a<=0.30, 0<=b<=0.50 and 2.8<=y<=3.9 and fluorine resins having an average molecular weight of 1,000,000 or less.
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Description

technical field

[0001] The present invention relates to an alkaline storage battery and a negative electrode for an alkaline storage battery used for the negative electrode of the alkaline storage battery. The alkaline storage battery comprises: a positive electrode; a negative electrode using a hydrogen storage alloy; and an alkaline electrolyte. Alkaline storage battery, in the alkaline storage battery that uses the negative electrode for alkaline storage battery containing fluororesin in the hydrogen storage alloy containing Mg-Ni-rare earth, improve the above-mentioned negative electrode for alkaline storage battery, when it is left in a charged state, prevent the discharge capacity and discharge voltage are lowered, and an alkaline storage battery with good storage characteristics can be obtained. Background technique

[0002] Historically, nickel-cadmium storage batteries have been widely used as alkaline storage batteries, but in recent years, compared with nickel-cad...

Examples

Embodiment 1

[0037] In Example 1, when producing an alkaline storage battery, the negative electrode and positive electrode produced as follows were used.

[0038] Manufacture of negative electrode

[0039] When manufacturing the negative electrode, Nd, Mg, Ni, and Al are mixed into a predetermined alloy composition, melted in an argon atmosphere using a high-frequency wave induction melting furnace, and then cooled to obtain a hydrogen storage alloy ingot.

[0040] Then, after heat-treating the ingot of the hydrogen storage alloy in an inert atmosphere to make it homogenized, the ingot of the hydrogen storage alloy was mechanically pulverized in an inert atmosphere and classified to obtain a composition of Nd 0.90 Mg 0.10 Ni 3.33 al 0.17 hydrogen storage alloy powder. In addition, the composition of the above-mentioned hydrogen storage alloy was measured by induction coupling plasma spectrometry (ICP). In addition, the particle size distribution of the hydrogen absorbing alloy powder...

Embodiment 2～4

[0052] In Examples 2 to 4, in the production of the negative electrode of the above-mentioned Example 1, the amount of the dispersion liquid of the above-mentioned FEP added with respect to 100 parts by weight of the above-mentioned hydrogen-absorbing alloy powder was changed, and the amount of FEP with respect to the solid content of the hydrogen-absorbing alloy powder The weight is 0.50% by weight in Example 2, 0.25% by weight in Example 3, and 0.10% by weight in Example 4. In addition, it is the same as the case of the above-mentioned Example 1, and produced The alkaline accumulator of embodiment 2~4.

Embodiment 5

[0054] In Example 5, in the manufacture of the negative electrode of the above-mentioned Example 1, the negative electrode was produced without adding the dispersion of the above-mentioned FEP to 100 parts by weight of the above-mentioned hydrogen storage alloy powder, and on the surface of the negative electrode, the hydrogen storage The alloy powder has a solid content of FEP of 0.60% by weight, except that the above-mentioned dispersion of FEP is applied and dried. In the same manner as in the above-mentioned Example 1, the alkaline powder of Example 5 was produced. storage battery.