摘要
用微乳液法制备了Co、Sr复合掺杂β-Ni(OH)2纳米粒子,详细研究了合成工艺条件对化学粒子结构形态与电化学性能的影响,探讨了掺杂纳米氢氧化镍电化学活性的作用机理.对样品分别进行了XRD、TEM分析,以及充放电性能和循环伏安特性的测试.结果表明,在pH=10.5、t=40℃,掺杂剂CoSO4、SrCl2的质量分数为3%、7%时,样品的平均粒径为35 nm左右,且分布较为均匀,无明显团聚现象.该条件下制备的样品以0.1C的倍率放电,在终止电位为1.0 V时,其比容量可达286.2 mAh/g,放电工作电位平稳于1.27 V.
Nano-β-Ni(OH) substituted with Co and Sr is prepared by the method of microemulsion. The preparation conditions of electrochemical performance are discussed,including changing temperature, pH and the content of additives, and the mechanism function. The results show that the electrochemical performance is improved when pH = 10. 5,t =40℃ ,and the contents of CoSO4 ,SrCl2 re 3% ,7% respectively. In the electrochemical test the discharge capacity of nano-β-Ni(OH) powder is 286. 2 mAh· g^-1 at the rate of 0. 1 C with an average discharge voltage of 1.27 V.
出处
《桂林工学院学报》
北大核心
2007年第1期111-114,共4页
Journal of Guilin University of Technology
基金
广西自然科学基金资助项目(0007019)
关键词
微乳液法
复合掺杂
纳米β-Ni(OH)
电化学性能
microe mulsion method
multiplex adulterate
nano-β-Ni (OH)
electrochemical performance