Effect of phthalocyanine compounds on the performance of MH/Ni battery

In MH/Ni battery, oxygen evolution causes a high inner pressure during charge and overcharge, and an inappropriate elimination of the oxygen in the battery results in accumulation of heat. This is the main obstacle in developing and applying high capability and high power battery. How to reduce the ratio of the chemical catalysis rate to the electric catalysis rate in MH/ Ni battery is considered as an urgent question. In this paper, ring-metalated phthalocyanine compounds were chosen as an electrochemical catalyst. Batteries with or without of the electrochemical catalyst were prepared. The curves of their inner pressure, the capacity attenuation, the discharge voltage and capacity at high current were compared. Experimental results show that the performance of batteries was obviously improved by the addition of the electrochemical catalyst.