| Title |
Electrochemical Study of Electrode Material of Ni-MH Battery for HEV and PEMFC Fuel Cell |
| Keywords |
Ni-MH battery ; Single spherical particle ; Microelectrode |
| Abstract |
Electrochemical hydrogenation/dehydrogenation properties were studied for a single particle of a Mm-based(Mm：misch metal) hydrogen storage alloy(MmNi3.55Co0.75Mn0.4Al0.3) for the anode of Ni-MH batteries. A carbon fiber microelectrode was manipulated to make electrical contact with an alloy particle, and the cyclic voltammetry and the galvanostatic charge/discharge experiments were performed. A single particle of the alloy showed the discharge capacity of 280[mAh/g], the value being 90[%] of the theoretical capacity. Data were compared with that of the composite film consisting of the alloy particles and a polymer binder, which is more practical form for Ni-MH batteries. Additionally, pulverization of the alloy particles are directly observed. Compared with the conventional composite film electrodes, the single particle measurements using the microelectrode gave more detailed, true information about the hydrogen storage alloy. |