Hiroshi Ishikawa

TL;DR: In this paper, Electrochemical impedance spectroscopy (EIS) was applied to metal hydride electrodes to investigate the deterioration of metal hydide electrodes using a mischmetal-based alloy, MmNi 3.5 Co 0.7 Al 0.8, using EIS.

TL;DR: In this article, the effect of substituting elements to improve the cycle life increased in the order: M ≡ Mn, Ni, Cu, Cr, AlandCo, and the lower the capacity, the smaller the volume expansion ratio, the slower the pulverizing rate, and lower the Vickers hardness were.

TL;DR: In this article, a columnar structure was formed so that the c -axis of the hexagonal structure was oriented parallel to the cooling plane, and the cylindrical sealed cell also showed a very long cycle life (a capacity decay of 6% after 2000 cycles).

TL;DR: The addition of small amounts of elements such as silicon, aluminium and titanium to LaNi2.5Co2 greatly influenced anode performance characteristics such as usable temperature range, capacity and its decay rate during repeated cycles, rate capability, low temperature dischargeability and self-discharge rate as discussed by the authors.

TL;DR: In this article, a low-cost negative battery electrode for MmNi-5-based alloys (Mm, mischmetal) was proposed and induction-melting tests showed that the surface region with a columnar structure had a longer cycle lifetime than the inner region with an equiaxed structure.