摘要
为了提高碱性电池的大功率放电性能,采用次氯酸钠氧化法制备了碱性电池正极活性材料NiOOH,并应用XRD、IR、TG以及恒流充放电等方法对样品的物理性质和电化学性能进行了表征。XRD和IR的测试结果显示,以b-Ni(OH)2和a-Ni(OH)2为前驱物,采用次氯酸钠氧化法制备的样品分别为b-NiOOH和g-NiOOH。热重分析结果说明,g-NiOOH具有较高的热分解温度,其热稳定性高于b-NiOOH。电化学测试则表明,NiOOH样品表现出优越的大功率放电性能,其放电曲线平坦,大电流放电容量相对较高,其放电电位也远高于MnO2样品。b-NiOOH和g-NiOOH均具有良好的可充性和电化学循环稳定性,但b-NiOOH的首次放电性能优于g-NiOOH。NiOOH样品适于用作高功率一次碱性电池和高性能碱性镍基蓄电池的正极活性材料。
NiOOH samples used as the cathode material of alkaline batteries were synthesized by the chemical oxidation method using NaClO as oxidant. The physical properties and electrochemical performances of the samples were investigated by XRD, IR, TG and galvanostatic charge-discharge experiments. The results of XRD and IR indicated that b -NiOOH and g -NiOOH could be respectively prepared from b -Ni(OH)2 and a -Ni(OH)2 by the NaClO oxidation method. The TG results display that g -NiOOH has higher thermal decomposition temperature and better thermal stability than b -NiOOH. The results of galvanostatic charge-discharge experiments show that the NiOOH samples have flatter discharge curves, higher discharge potential and larger discharge capacity at a relatively higher rate than MnO2. Both b -NiOOH and g -NiOOH have excellent electrochemical reversibility and cyclic stability, but b -NiOOH displays better first discharge performance than g -NiOOH. NiOOH samples are suitable to be used as the active cathode material in primary alkaline batteries and secondary alkaline nickel-based batteries.
出处
《电源技术》
CAS
CSCD
北大核心
2004年第11期700-703,共4页
Chinese Journal of Power Sources
基金
国家自然科学基金资助项目(59902004)
