Shape-changing capability

Recent observation of the opposite cycling effect—denudation at the electrode center and zinc accumulation at the electrode edges —is an additional factor to be taken into account in future attempts at a better understanding of the mechanism of zinc shape change. Without this understanding further semi empirical attempts to extend the cycle life of the Ni-Zn battery without compromising its high-performance capability, seem to have little chance of success. 

Recently, actively-moving materials having the capability to perform two subsequent shape changes have been developed [86-89]. Such materials allowed - by the individual choice of Ttrans - either two different dual-shape effects, whose dualshape capability can be easily adjusted to the application relevant requirements, or a triple shape-capability. While the first case has the advantage that only one material needs to be designed for enabling a broad spectrum of Ts, the latter case offers the possibility of complex movements, which cannot be realized with dual-shape materials or only with a combination of different materials. 

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