| 摘要 |
PURPOSE:To lengthen the cycle life of a battery and to decrease the dispersion of the cycle life. CONSTITUTION:A rare earth hydrogen storage allay used in a negative electrode has 1. a hydrogen storage amount as determined by pressure-component constant temperature line at 60+ or -5 deg.C based on JIS H7201 of 0.76 or more, 2. an equilibrium hydrogen pressure of 0.8-2.0atm, and 3. a BET specific surface area after crushed once under a condition of a gage pressure of 5-10atm at 2-30 deg.C of 0.04-0.11m<2>/g. |
