Study On Influence Of Technology Factors On Properties Of Hydrogen-Storage Alloy Electrode And Microcosmic Principle Of Its Electronic Structure

In this paper,the characteristics and regularities of effects of activation and self-discharge and charge/discharge rate on the properties of Ni-MH battery have been investigated The discharge capacities and the cycle life for Ni-MH batteries with different technology factors are analyzed by chemical pattern recognition method, and some criteria for improving battery properties are obtained The electronic structures of RENi5 (RELa, Ce, Pr, Nd) and LaNi4M (M=Ni, Cu, Mn, Al)as well as their hydrides were investigated by the SCC-DV-XU (Self-Consistent-Charge Discrete Variational Xa ) method The influence of electronic structures on properties of absorbing hydrogen and electrode were studied These results showed thatI If the capacity of a electrode is big during the course of activating, the capacity of the corresponding battery is big, so activation can serve as the first step in quality examining The cycle lifetime can be predicted by comparing the variation of the discharge curve in self-discharge The batteries activated by moderate electric current take on high discharge capacity and have long cycle life for preserving high ratio of electric capacity and steady property of discharge voltage plateau during the course of the using in cycle2 Binder, conductor and additive are important influencing factors on battery properties Besides, binder and conductor act on discharge capacities and cycle life in opposition to each other Binder and additive are the most significant in influencing on2discharge capacities and cycle life, respectively Reducing the ratios of addictive and conductor in battery and increasing the strengthen of binder are favorable for improving synthetical properties of battery3 The results show that the stabilities of RENi5 and LaNi4M hydrides are related to charge transferred to hydrogen atom, and decrease with increase of the transferred charge There is a strong orbital interaction between 3d orbit in Ni atom and 4f orbit in RE atom, which is weaken when hydride is formed The equilibrium plateau pressure of RENi5 rises with lowering of Fermi energy of hydride the cycle life of LaNi4M is effected by strength of bond between 4f orbit in La atom and 4p orbit in Ni(1) atom, the stronger the bond is, the longer the cycle life is, there is also a orbital action between 3d orbit in Ni(3) atom and 4f orbit in Ia atom, the orbital action, however, is weaken when hydride is formed...