Nickel-hydrogen secondary battery
US6200705A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 27, 1998 |
| Grant date | Mar 13, 2001 |
| Priority date | — |
| Expiry date | Nov 27, 2018 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02E60/10
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A nickel-hydrogen secondary battery having a negative electrode comprising a hydrogen-absorbing alloy containing magnesium, a rare earth element and nickel as essential elements, which is capable of suppressing the self-discharge being occurred under the condition of high temperature storage, or the like. This secondary battery comprises a negative electrode containing a hydrogen-absorbing alloy, a positive electrode containing nickel hydroxide, a separator comprising a non-woven fabric, and an alkaline electrolyte. The hydrogen-absorbing alloy is represented by (R.sub.1-x Mg.sub.x)Ni.sub.y A.sub.z (wherein R is at least one element selected from rare earth elements (including yttrium), Ca, Zr and Ti, A is at least one element selected from Co, Mn, Fe, V, Cr, Nb, Al, Ga, Zn, Sn, Cu, Si, P and B), and x, y and z are atomic ratio individually defined as 0<x<1, 0.ltoreq.z.ltoreq.1.5, 2.5.ltoreq.y+z<4.5). The ratio between the weight of the hydrogen-absorbing alloy per unit area of the negative electrode (M1 (mg/cm.sup.2)) and the weight per unit area of the separator (M2 (g/m.sup.2)) meets the condition of M1/M2.ltoreq.6.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.