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Nano-scale nickel hydroxide was prepared by precipitate transformation method in the paper. Effect of rinse pH on the agglomeration degree and electrochemical performance of nano-scale Ni (OH)2 was investigated. The measurement results of XRD and TEM indicate that the prepared nano-scale Ni (OH)2 is β (II)-phase, the grain size is in the rang of 10 ~ 50nm, and rinse pH exerts a great influence on the agglomeration degree of nano-scale Ni(OH) 2.The agglomeration of material becomes very obvious when rinse pH = 11, and the density of nano-scale Ni(OH)2 is enhanced obviously. Cyclic voltammetry(CV) and simulate cells experiment show that nano-scale Ni(OH)2 with suitable agglomeration degree have better electrochemical CV performance than those with ideal disperse Ni (OH)2and micron Ni(OH)2, and its proton diffusion coefficient is also the highest. It can elevate the discharge potential platform and prolongs discharge time, so the utilization ratio of Ni (OH)2 is raised.`` 相似文献
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采用均相沉淀法使NiCl_2溶液与沉淀剂NaOH反应,制备出纳米级Ni(OH)_2超微粉末。用XRD检测,证实其为电极用β-Ni(OH)_2,用TEM对样品进行形貌分析,结果表明,所得产物为不规则的颗粒状的纳米晶,粒径为 20~40 nm。研究还初步探讨了沉淀剂浓度、反应温度、配合剂用量等实验参数对纳米粉组成和结构的影响。并应用正交实验法,对工艺条件进行了优化。将制备出的纳米级Ni(OH)_2按一定比例掺入普通的球型微米级Ni(OH)_2中,充放电测试结果表明,比容量可增加约10%。 相似文献
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洗涤时pH值对纳米级β-Ni(OH)2的团聚程度和电化学性能的影响 总被引:1,自引:0,他引:1
Nano-scale nickel hydroxide was prepared by precipitate transformation method in the paper. Effect of rinse pH on the agglomeration degree and electrochemical performance of nano-scale Ni(OH)2 was investigated. The mea-surement results of XRD and TEM indicate that the prepared nano-scale Ni(OH)2 is β(Ⅱ)-phase,the grain size is in the rang of 10~50nm,and rinse pH exerts a great influence on the agglomeration degree of nano-scale Ni(OH)2. The agglomeration of material becomes very obvious when rinse pH=11, and the density of nano-scale Ni(OH)2 is enhanced obviously.Cyclic voltammetry(CV) and simulate cells experiment show that nano-scale Ni(OH)2 with suitable agglomeration degree have better electrochemical CV performance than those with ideal disperse Ni(OH)2 and micron Ni(OH)2, and its proton diffusion coefficient is also the highest. It can elevate the discharge potential platform and prolongs discharge time, so the utilization ratio of Ni(OH)2 is raised. 相似文献
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