Structural characteristics of spherical Ni(OH)2and its charge/discharge process mechanism①
来源期刊：中南大学学报(英文版)2005年第1期
论文作者：彭美勋 沈湘黔 王零森 危亚辉
文章页码：5 - 8
Key words：structure; crystallinity; spherical Ni(OH) 2; proton diffusion; charge/discharge process
Abstract: Spherical Ni(OH) 2 particles were prepared by an aqueous solution precipitation route. The structure of spherical Ni(OH)2was investigated by scanning electron microscopy and transmission electron microscopy and compared with that of traditional Ni(OH) 2. The results show that the spherical nickel hydroxide consists of Ni(OH) 2 spheres with a reticulate structure of platelet-like, which is almost arranged radially and the crystalline grains intervene and connect with each other to form a three-dimensional net. The spherical Ni(OH) 2 particle is full of pores,crannies between cleave planes. It is supposed that this structure is beneficial to the structural stability for the spherical particles during the charge/discharge processes and can improve the cycle life of the electrode; the pores and the crannies in spherical particles can shorten the proton diffusion distance and speed its velocity, which may result in that the local polarization is lowered. The electrochemical performances of the spherical Ni(OH) 2are improved by enhancing the conducting properties of the crystalline lattice due to its quick proton diffusion.
基金信息：the National Natural Science Foundation of China
