생산기술특허연구회

Electrochemical properties were studied for a single particle of active material of hydrogen storage alloy (MmNi3.55CoMn0.4Al0.3) and nickel hydroxides (NiOH)₂for the secondary Nickel Metal Hydride (Ni-MH) batteries using the microelectrode, which was manipulated to make electrical contact with an active material particle for cyclic voltammograms (CV) and potential-step experiments. As a result of CV test, it was found that three kinds of hydrogen oxidation peaks at -0.90V, -0.75V and -0.65V and hydrogen evolution peak at -0.98V for hydrogen storage alloy were separately observed and two kinds of peaks of proton oxidation/reduction at 0.45V and 0.32V and oxygen evolution reaction (OER) at 0.60V for nickel hydroxides were also more clearly observed. Furthermore hydrogen diffusion coefficient within a single particle was also found to vary the order between 10-9 and 10-10cm/s over the course of hydrogenation and dehydrogenation process for potential-step experiments. 더 자세한 내용은 첨부파일 참조