Influence of the electrode preparation method on the electrochemical performance of metal hydride electrodes containing metal-carbon composites.

摘要

Hydrogen storage alloys are used in the negative electrode active mass, in nickel-metal hydride rechargeable batteries. There is a set of specific properties for hydrogen absorbing alloy if there are to be used in this type of batteries. Those properties are: the high real capacity value of the alloy in absorption-desorption process, proper changes of the lattice parameter during the hydrogen absorption, stability in concentrated alkalis, good kinetic of the electrode reactions, fast activation time of the alloy and the overall price of the active mass. To achieve and improve those properties composite materials-based on carbon structures and metal alloy can be used, instead of pure metal alloys. Those composites enhance the kinetics, increase the conductivity and finally are meant to reduce the price for this type of active mass.