Rare earth metal-nickel hydrogen storage alloy, process for producing the same, and anode for nickel-hydrogen rechargeable battery
US5817222A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Nov 27, 1996 |
| Grant date | Oct 6, 1998 |
| Priority date | — |
| Expiry date | Nov 27, 2016 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02E60/10
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A rare earth metal-nickel hydrogen storage alloy having a composition represented by the formula (1) EQU RNi.sub.x-y M.sub.y (1) (wherein R stands for La, Ce, Pr, Nd, or mixtures thereof, M stands for Co, Al, Mn, Fe, Cu, Zr, Ti, Mo, Si, V, Cr, Nb, Hf, Ta, W, B, C, or mixtures thereof, x satisfies the formula of 3.5.ltoreq.x<5, and y satisfies the formula of 0<y.ltoreq.2, crystals in the alloy having a LaNi.sub.5 type single phase structure, the alloy including in an amount of not less than 5 volume % and less than 95 volume % thereof crystals each containing not less than 2 and less than 17 antiphase boundaries extending perpendicular to C-axis of a grain of the crystal in the alloy per 20 nm along the C-axis, a method of producing the same, and an anode for a nickel hydrogen rechargeable battery containing as an anode material the above rare earth metal-nickel hydrogen storage alloy and an electrically conductive material. This anode can improve the initial activity, the battery capacity, and the battery life at the same time.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.