镍正极掺杂NiOOH的MH/Ni电池性能

将化学氧化法合成的NiOOH以一定的比例掺杂到商用球形Ni(OH)2粉末当中,以此作为镍正极活性材料,制成额定容量为1 5Ah圆柱密封AA型MH/Ni碱性蓄电池·采用恒流充放电和交流内阻分析方法测试了该电池的性能·结果表明:镍正极掺杂NiOOH的MH/Ni电池在活化效率和循环寿命方面得到了明显的改善和提高,掺杂NiOOH的镍正极具有更高的反应活性及更小的电化学反应阻抗,因而表现出良好的电化学性能·实验表明,镍正极活性材料中NiOOH的掺杂量为1%～3%时对电池性能有较好的影响,掺杂量过多会降低电池的放电容量·

Performance of Ni/MH Batteries with NiOOH-Doped Nickel Positive Electrode

The secondary nickel-metal hydride (Ni/MH) batteries were developed and their performance was investigated, of which the active material of positive electrodes were made from commercial Ni(OH)2 spherical powder doped with NiOOH that was proportionately synthesized via oxidation. Constant current charge/discharge and AC internal impedance were tested to characterize the electrochemical performance of AA-type cylindrical alkaline Ni/MH batteries with rated capacity 1.5 Ah. The experimental results showed that the Ni/MH batteries developed exhibit better performances in activation efficiency and cycle life than the conventional ones because of their higher reaction activity and lower electrochemical impedance to NiOOH. It was proved that when the content of the dopant NiOOH was 1%-3% in the active material for nickel positive electrode, the electrochemical performance of the batteries can further be improved. Otherwise, overdoping of NiOOH will decrease the discharge capacity of the batteries.