【摘要】 采用化学共沉淀法制备了镍铝和钴铝2种层状氢氧化物[Ni4Al(OH)10]OH和[Co4Al(OH)10]NO3。将前者作为电极活性材料,后者及石墨作为正极导电添加剂,通过单纯形重心设计研究了正极中3种物质的最佳配比,使其大电流充放电性能得到有效地提高。结果表明,电极的性能与电极配方密切相关。当[Ni4Al(OH)10]OH、[Co4Al(OH)10]NO3和石墨的质量分数分别为64.45%、12.27%和23.28%时,电极在经过800 mA/g 200次充放电后的放电比容量最高,为270.5 mA.h/g(最大值的88.7%);[Co4Al(OH)10]NO3的加入使电极的放电比容量和循环寿命得到了显著的提高。更多还原

【Abstract】 Two layered double hydroxides,[Ni4Al(OH)10]OH and [Co4Al(OH)10]NO3,were synthesized by chemical co-precipitation.The former was used as the active material and the latter as well as graphite were used as the conductive additives,respectively.The optimum ratio of the three materials in a positive electrode was estimated through the simplex-centroid design to improve the charge/discharge properties efficiently at a high current density.When the mass fractions of [Ni4Al(OH)10]OH,[Co4Al(OH)10]NO3 and graphite are 64.45%,12.27% and 23.28%,respectively,the discharge capacity can retain 270.5 mA·h/g(88.7% of the maximum) after 200 cycles at a current density of 800 mA/g.更多还原