机械球磨制备氢氧化镍的电化学性能  

Preparation and Electrochemical Characterization of the Nickel Hydroxide Prepared by Mechanical Ball Milling

作　　者：范海满[1] 曹余良[1] 艾新平[1] 杨汉西[1] 

机构地区：[1]武汉大学化学与分子科学学院,湖北武汉430072

出　　处：《武汉大学学报（理学版）》2006年第4期435-438,共4页Journal of Wuhan University:Natural Science Edition

基　　金：国家重点基础研究(973)计划资助项目(2002CB211805)

摘　　要：采用直接固相球磨含结晶水镍盐与碱的方法在短时间内(0.5 h)合成了氢氧化镍正极材料.X-射线衍射和扫描电镜分析表明:球磨反应产物为-βNi(OH)2,粒度分布在5μm左右,粒子之间存在着少量纳米级的颗粒,粒子表面蓬松,颗粒具有较大的比表面积且极富孔隙结构.充放电测试表明,该材料可逆容量达到250 mAh.g-1以上,放电容量高于市售的球形氢氧化镍;大倍率电流密度(289 mA.g-1)充放容量仍达220 mAh.g-1,且具有良好的循环性能.与传统的液相合成法相比,该合成方法快速简单、无污染排放,具有良好的应用前景.The high capacity nickel hydroxide was prepared by direct ball milling of solid nickel chloride and sodium hydroxide for 0.5 h. The sample as prepared has a β-Ni（OH）2 structure with particle size of less than 5 μm, and there are some nano-particle among big particle. The SEM picture shows that the particle has loose surface and porous structure. Electrochemical measurements revealed that the ball-milled β-Ni（OH）2 has the discharge capability of 250 mAh·g^-1 and a quite high-rate capability of 220 mAh·g^-1 at 1 C. Since this solid-reaction method can avoid waste emission as in solution synthesis, the ball milling synthetic method may provide a simple and efficient route for preparation of β-Ni（OH）2 for battery applicatlons.

关 键 词：机械球磨 Β-NI(OH)2 高活性 绿色合成 

分 类 号：O614[理学—无机化学]