可充碱锰电池用化学二氧化锰的制备

Preparation of Chemical MnO_2 used in Rechargeable Alkaline Zinc Manganese Dioxide Battery

温度控制在 85～ 95℃ ,在HNO3介质中 ,用KMnO4氧化MnCl2 和Bi(NO3) 3的混合溶液 ,可制得具有良好可充性能的掺铋二氧化锰 (Bi MnO2 ) ,该样品在 9mol/LKOH溶液中有稳定的循环伏安曲线且经X射线衍射分析测得其在不同放电深度均无Mn3O4生成 ,这表明在MnO2 中添加铋可阻止不具有电化学活性的Mn3O4生成 ;用该样品做成的模拟电池做连续充放电实验 ,电极的循环次数由原来的 5～ 6次 ,提高到 60次以上。

Bi doped MnO 2 produced by mixture of MnCl 2 and Bi(NO 3) 3 with KMnO 4 at 85～95℃ in nitric acid solution has good rechargeability, the product has stable curves of clyclic voltmmogram in 9mol/L KOH solution. X-ray diffraction of diffrent discharge depths shows no Mn 3O 4. This indicated that the presence of bismuth in manganese dioxide prevents the formation of the poorly electroactive Mn 3O 4. The cycle life are improved from 5～6 to 60 in charge discharge cyclic techniques.