基于Na_(2)S_(2)O_(8)法制备的锌银电池AgO正极的性能研究

Study of AgO Positive Electrode for Zinc Silver Battery Based on the Preparation of Na_(2)S_(2)O_(8)

锌银电池中AgO正极的稳定性是影响其贮备寿命的关键因素.本文比较了Na_(2)S_(2)O_(8)法制备的AgO和某厂制备的AgO两种正极材料,发现两种正极材料颗粒尺寸都不均匀,且都含有Ag_(2)O,但某厂制备的AgO中还含有Ag_(2)CO_(3).Na_(2)S_(2)O_(8)法制备的AgO放电比容量比某厂制备的AgO高大约50%,原因在于用Na_(2)S_(2)O_(8)制备的正极材料AgO中质量分数88.17%,而某厂制备的AgO质量分数仅为65.82%.用热重曲线分析法研究发现Na_(2)S_(2)O_(8)制备的AgO的两个阶段的分解活化能均较高,热稳定性更好,可能是因为AgO的结晶度更高.

The stability of AgO cathode in zinc silver battery is the key factor influcencing its storage life.In this paper, two cathode materials, AgO prepared by sodium persulfate and that prepared by a certain factory have been compared.It is found that the particle size of the two cathode materials were uneven and contained Ag_(2)O,but Ag_(2)CO_(3)was also found in the positive electrode powder prepared by a certain factory.The specific discharge capacity of the AgO prepared by sodium persulfate is about 50% higher than that of the AgO prepared by a certain factory.This is because the content of AgO by sodium persulfate is 88.17%,but that is only 65.82% by a certain factory.The thermogravimetric analysis shows that the decomposition activation energy of the AgO prepared by sodium persulfate is higher and the thermal stability is better, perhaps it is because its higher crystallinity.