Nano-scale nickel hydroxide was pre pared by precipitate transformatio n method in the paper￡(r)Effect of rinse pH on the agglomeration degree and elec trochemical performance of nano￡-sc ale Ni ￡¨OH￡(c)￡2 w...Nano-scale nickel hydroxide was pre pared by precipitate transformatio n method in the paper￡(r)Effect of rinse pH on the agglomeration degree and elec trochemical performance of nano￡-sc ale Ni ￡¨OH￡(c)￡2 was investigated￡(r)The mea-surement results of XRD and TEM indic ate that the prepared nano￡-scale Ni ￡¨OH￡(c)2 isβ?-phase,the grain size is in the rang of 10?50nm,and rinse pH exerts a great influence on the agglomera tion degree of nano￡-scale Ni ￡¨OH￡(c)￡2 ￡(r)The agglomeration of material becom es very obvious when rinse pH ￡1/211￡?and the density of nano￡-scale Ni ￡¨OH￡(c)2 is enhanced obviously￡(r)Cyclic voltammetry￡¨CV￡(c)and simulate cells experiment show t hat nano￡-scale Ni ￡¨OH￡(c)2 with suitable agglomeration degree have better electrochemical CV performa nce than those with ideal disperse Ni ￡¨OH￡(c)2 and micron Ni ￡¨OH￡(c)2 ￡?and its proton diffusion coefficie nt is also the highest￡(r)It can elevate the discharge potential platform and prolongs discharge tim e,so the utilization ratio of Ni ￡¨OH￡(c)￡2 is raised￡(r)展开更多
文摘用微乳液法制备了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.
文摘Nano-scale nickel hydroxide was pre pared by precipitate transformatio n method in the paper￡(r)Effect of rinse pH on the agglomeration degree and elec trochemical performance of nano￡-sc ale Ni ￡¨OH￡(c)￡2 was investigated￡(r)The mea-surement results of XRD and TEM indic ate that the prepared nano￡-scale Ni ￡¨OH￡(c)2 isβ?-phase,the grain size is in the rang of 10?50nm,and rinse pH exerts a great influence on the agglomera tion degree of nano￡-scale Ni ￡¨OH￡(c)￡2 ￡(r)The agglomeration of material becom es very obvious when rinse pH ￡1/211￡?and the density of nano￡-scale Ni ￡¨OH￡(c)2 is enhanced obviously￡(r)Cyclic voltammetry￡¨CV￡(c)and simulate cells experiment show t hat nano￡-scale Ni ￡¨OH￡(c)2 with suitable agglomeration degree have better electrochemical CV performa nce than those with ideal disperse Ni ￡¨OH￡(c)2 and micron Ni ￡¨OH￡(c)2 ￡?and its proton diffusion coefficie nt is also the highest￡(r)It can elevate the discharge potential platform and prolongs discharge tim e,so the utilization ratio of Ni ￡¨OH￡(c)￡2 is raised￡(r)
