A new method of reusing discarded Cd/Ni battery is presented. The discarded Ca/Ni battery is crushed, heat treated and translated into salt solution. Then the Fe 2+ containing in it is oxidized into Fe 3+ which is rem...A new method of reusing discarded Cd/Ni battery is presented. The discarded Ca/Ni battery is crushed, heat treated and translated into salt solution. Then the Fe 2+ containing in it is oxidized into Fe 3+ which is removed by regulating the pH value of the solution. Thus a solution containing Ni 2+ and Cd 2+ is obtained. A mixture of Ni(OH) 2 and Cd(OH) 2 is prepared from the solution,and this mixture does not contain Fe and its compound which is confirmed by AES,XPS and EDX . According to the sealed principle and technique requirement of the sealed Ni/Cd battery, the mixture is added to the active materials of both positive and negative electrodes in it. The added material acts as anti-electrode one. The distribution of anti-electrode materials, utilization rate of the active materials, over discharge performance and capacities at a current of ICA and -18 ℃ of the batteries are measured.The results show that the distribution of antielectrode materials was uniform in the electrodes, and electrodes containing the mixture has the same performance as that of unadded reference ones. The distinguishing feature of this process for reusing discarded Cd/Ni battery is that it is not necessary to separate Ni 2+ and Cd 2+ in the mixed waste. Therefore, the process cost would be decreased.展开更多
文摘A new method of reusing discarded Cd/Ni battery is presented. The discarded Ca/Ni battery is crushed, heat treated and translated into salt solution. Then the Fe 2+ containing in it is oxidized into Fe 3+ which is removed by regulating the pH value of the solution. Thus a solution containing Ni 2+ and Cd 2+ is obtained. A mixture of Ni(OH) 2 and Cd(OH) 2 is prepared from the solution,and this mixture does not contain Fe and its compound which is confirmed by AES,XPS and EDX . According to the sealed principle and technique requirement of the sealed Ni/Cd battery, the mixture is added to the active materials of both positive and negative electrodes in it. The added material acts as anti-electrode one. The distribution of anti-electrode materials, utilization rate of the active materials, over discharge performance and capacities at a current of ICA and -18 ℃ of the batteries are measured.The results show that the distribution of antielectrode materials was uniform in the electrodes, and electrodes containing the mixture has the same performance as that of unadded reference ones. The distinguishing feature of this process for reusing discarded Cd/Ni battery is that it is not necessary to separate Ni 2+ and Cd 2+ in the mixed waste. Therefore, the process cost would be decreased.
