| 固相反应合成LiCoPO4中间体的反应动力学 |
| |
| 引用本文： | 黄映恒,童张法,韦藤幼,李斌.固相反应合成LiCoPO4中间体的反应动力学[J].物理化学学报,2011,27(6):1325-1334. |
| |
| 作者姓名： | 黄映恒 童张法 韦藤幼 李斌 |
| |
| 作者单位： | 1. School of Chemistry and Chemical Engineering, Guangxi University, Nanning 530004, P. R. China;
2. Department of Metallurgy Engineering, Guilin University of Technology at Nanning, Nanning 530001, P. R. China |
| |
| 基金项目： | 国家自然科学基金，广西青年科学基金，广西教育厅科研项目 |
| |
| 摘 要： | 以磷酸二氢铵、醋酸钴和氢氧化锂为原料, 用低温固相反应合成含Li+的NH4CoPO4前驱体, 再经过高温焙烧合成LiCoPO4粉体. 应用傅里叶变换红外光谱(FTIR)、X射线衍射(XRD)和热重-差热分析(TG-DTA)等技术对合成产物进行表征. 结果表明: 焙烧气氛影响中间体的生成, 含Li+的前驱体NH4CoPO4在210-500 °C的空气中发生脱水脱氨反应, 制备过程存在“酸碱共同体”的中间体(CoHPO4·LiCoPO4·Co2(OH)PO4·Li3PO4). 中间体生成反应遵循界面反应幂律机理, 表观活化能约50.0 kJ?mol-1, 过程机理函数为g(x)=(1-α)-1. 中间体继续脱水反应生成LiCoPO4, 平均表观活化能约为54.2 kJ?mol-1. 物系非晶化和晶化过程对中间体的存在没有直接的影响, 高温对中间体的分解产物LiCoPO4和LiCoPO4的晶体生长有利, 在550 °C以上温度中间体可分解得到完整的LiCoPO4晶体.
|
| 关 键 词： | LiCoPO4 含锂磷酸盐 中间体 固相反应 反应机理 反应动力学 |
| 收稿时间： | 2010-11-25 |
| 修稿时间： | 2011-03-25 |
Reaction Kinetics of the Intermediate in Synthesis of LiCoPO4 by Solid-State Reaction |
| |
| HUANG Ying-Heng,TONG Zhang-Fa,WEI Teng-You,LI Bin.Reaction Kinetics of the Intermediate in Synthesis of LiCoPO4 by Solid-State Reaction[J].Acta Physico-Chimica Sinica,2011,27(6):1325-1334. |
| |
| Authors: | HUANG Ying-Heng TONG Zhang-Fa WEI Teng-You LI Bin |
| |
| Institution: | 1. School of Chemistry and Chemical Engineering, Guangxi University, Nanning 530004, P. R. China;
2. Department of Metallurgy Engineering, Guilin University of Technology at Nanning, Nanning 530001, P. R. China |
| |
| Abstract: | A precursor NH4CoPO4 containing Li+ was synthesized using a low temperature solid-state reaction with ammonium dihydrogen phosphate, cobalt acetate, and lithium hydroxide. LiCoPO4 powder was manufactured by high temperature baking. The products were characterized by Fourier transform infrared (FTIR) spectroscopy, X-ray diffraction (XRD) and thermogravimetry-differential thermal analysis (TG-DTA). The results showed that the formation of the intermediates was effected by the baking atmosphere. NH4CoPO4 conta... |
| |
| Keywords: | LiCoPO4 |
| 本文献已被 CNKI 万方数据 等数据库收录！ |
| 点击此处可从《物理化学学报》浏览原始摘要信息 |
| 点击此处可从《物理化学学报》下载免费的PDF全文 |
|
