Preparation Of Hydrogen Storage Alloys By Soft Chemical Method And Their Electrochemical Properties

Hydrogen has been regarded a~ one of new energy sources because of its cleanliness and high energy density. But if we want to utilize it effectively, we must resolve the difficulty that how to store hydrogen and transport it. It is insecure and uneconomical that we transport hydrogen with the manner of gas or liquid. The hydrogen storage alloys what developed in 1970s can be used to resolve the question availably, and its applied field is abroad such as in purifying hydrogen and stockpiling it, vehicle what with hydrogen as fuel, Ni-MH battery and so on.We haye prepared the LaNi5 alloys and its series through soft chemical method. The fine size, well-proportioned particles of alloys can be prepared by controlling the distribution of size of precursor. We have made some electrodes of Ni-MH battery with the alloys and then examined its electrochemical behaviour. The primary experiment process was summarized as follows:1.We have prepared the mixed oxide precursor with a particle size of 2Onm through combustion method with nitrate as raw material and glycin as reducer and complexing agent.2.The alloys with a particle size less than lOj~m were be prepared through reduction diffusion. method by deoxidizing precursor two hours with CaH2 at 8500C. The alloys have high activity in the surface. If we append LiC1 as flux to the reductive process, the alloys with a particle size of 2~im can be prepared at 650.3.The alloys have been made into electrode of Ni-MH battery, then we examined its electrochemical behaviour. The result shows the electrode has much easier active behavior and higher discharge capacity than the electrode made of melted alloys.