Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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中国有色金属学报

ZHONGGUO YOUSEJINSHU XUEBAO

第9卷    第3期    总第32期    1999年9月

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文章编号:1004-0609(1999)03-0504-06
制备条件对Ni(OH)2微晶结构参数的影响
王超群1  任小华1  蒋文全1  周    辉1  贺万宁2

(1 北京有色金属研究总院,北京 100088; 2  长沙矿冶院,长沙 410012)

摘 要: 用化学共沉淀法在可控pH值、添加剂和加氨水等条件下由NiSO4和NaOH反应结晶制备了氢氧化镍粉末。高性能的球形氢氧化镍颗粒系由带微孔的微晶组成的,其X射线谱线呈各向异性宽化,其中(h0l)型谱线宽化最为严重。各向异性谱线宽化的性质与氢氧化镍中微晶结构特性有关(尤其是整个材料中存在着堆垛层错平面缺陷)。通过X射线衍射测量的微晶结构参数如微晶粒度、晶格常数ac 轴的大小以及(100)、(001)谱线强度等,可以用于建立其与制备工艺和电化学活性之间的关系。一般在较低的结晶度和(100)谱线强度下以及较大的c 轴下可以获得较好的电化学活性。

 

关键字: 氢氧化镍;微晶结构参数;各向异性谱线宽化;电化学活性;利用率

Influence of preparation conditions on structure parameters of microcrystals in nickel hydroxide powder
Wang Chaoqun, Ren Xiaohua, Jiang Wenquan, Zhou Hui, He Wanning

General Research Institute for Non-ferrous Metals, Beijing 1000 88 P.R.China

Abstract:A high performance nickel hydroxide,β-Ni (OH)2 powder was produced by chemical coprecipitating process using NiSO4 and NaOH solution under highly controlled pH-values and adding to aqueous ammonia as a complexing agent. The apparently spherical Ni(OH)2 particles consisted of many microcrystals and its diffraction patterns display anisotropic broadening, i. e. most of (h0l) and (00l) type line broadening, a few of (h00) type line broadening. The line broadening properties are closely related to the microcrystal orientation growth character in β-Ni (OH)2  preparation process. The utilization of the Ni (OH)2 active mass in an alkaline storage battery could be correlated to the crystalline parameters of microcrystals as determined by X-ray diffraction measurements, i. e. the smaller crystal size both in a- and c- directions, the larger c-lattice constant and the lower crystallinity led to the higher utilization ratio.

 

Key words: nickel hydroxide; structural parameters of microcrystals; anisotropic spectro-line broadening; utilization efficiency; electrochemistry activity

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

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