添加剂γ-CoOOH对氢氧化镍电极性能的影响  

The effect of additive γ-CoOOH on electrode characteristics of nickel hydroxide

作　　者：常照荣[1] 李华吉[1] 汤宏伟[1] 吕豪杰[1] 

机构地区：[1]河南师范大学化学与环境科学学院,河南新乡453007

出　　处：《功能材料》2009年第9期1541-1544,共4页Journal of Functional Materials

基　　金：国家自然科学基金资助资助项目(20671031)

摘　　要：用化学氧化法合成了3.40价的钴化合物,X射线衍射分析表明,该化合物的晶体结构与γ-NiOOH相同,属于准六方层状结构。粉末电阻测试表明,这种高价钴化合物的电阻仅为二价Co(OH)3的1/3,添加到氢氧化镍电极中,可以与氢氧化镍颗粒形成一整体的导电网络,不仅能有效地改善充放电过程中电极反应的可逆性和循环性能,而且大大提高正极活性物质利用率和电极活化速度,在0.2C倍率充放电条件下,活性物质利用率经一次循环就能达到100.6%。In this paper, high-valence （3.40） cobalt compounds were synthesized by a chemical oxidation method. The X-ray diffraction （XRD） analysis indicated that the crystal structure of this compound possessed quasihexagonal layered crystal structure, which was similar to that of γ-NiOOH. The powders resistance measure- ment demonstrated that the resistance of this high-valence cobalt compound was only one third of that of β-Co （OH）2. It could be formed a conducting network through adding this compound into nickel hydroxide electrode, which not only effectively improved the reversibility and cycle performance of electrode reaction in the process of charge and discharge, but also greatly imereased the utilization ratio of cathode active materials and activation rate. It was found that cobalt with a valence of 3.40 has a higher performance within one cycle. The utilization of the active material can reach 100.6% at a discharge rate of 0.2C.

关 键 词：氢氧化镍电极 钴添加剂 高氧化态 粉末电阻 γ-CoOOH 

分 类 号：TM912[电气工程—电力电子与电力传动] O646[理学—物理化学]