超临界乙醇法制备超薄碳层包覆磷酸铁锂的研究  

Study on synthesis of ultrathin carbon coated lithium iron phosphate via supercritical ethanol method

作　　者：刘志军[1] 孙海礼 董超[1] 魏炜[1] 刘凤霞[1] 许晓飞[1] 李志义[1] LIU Zhi-jun;SUN Hai-li;DONG Chao;WEI Wei;LIU Feng-xia;XU Xiao-fei;LI Zhi-yi(R&D Institute of Fluid and Powder Engineering,Dalian University of Technology,Dalian 116024,China)

机构地区：[1]大连理工大学流体与粉体工程研究设计所,辽宁大连116024

出　　处：《现代化工》2021年第11期86-90,共5页Modern Chemical Industry

基　　金：国家自然科学基金(21676049)。

摘　　要：采用超临界乙醇热法合成磷酸铁锂,并以其面积平均粒径为评价标准,通过设计4因素3水平正交实验考察温度、乙醇油胺体积比、装填度和物料物质的量对实验的影响,得到优化粒径的参数为:温度为360℃、乙醇油胺体积比为3.5∶1、装填度为64%、物料物质的量为0.5 mmol。结果表明,在反应过程中,油胺作为表面活性剂和碳源前驱体,在保护气下经过煅烧处理转变为一层超薄碳层,最终得到2.5 nm厚的碳层包覆的多孔纳米结构磷酸铁锂,从而有效提升了其导电性和在电解液中的稳定性。Lithium iron phosphate is synthesized via supercritical ethanol thermal method,and its area average particle size is taken as the evaluation standard.The effects of temperature,the volume ratio of ethanolamine to oleylamine,packing degree and material amount on the experiment are investigated through designing four-factor and three-level orthogonal experiment.The parameters for obtaining optimal particle size are determined as follows:the temperature is at 360℃,the volume ratio of ethanolamine to oleylamine is 3.5∶1,the packing degree is 64%,and the amount of material is 0.5 mmol.The results show that oleylamine,as a surfactant and precursor of carbon source,is calcined under the protective gas to transform into an ultra-thin carbon layer.Finally,2.5 nm thick carbon layer coated porous nanostructure lithium iron phosphate is obtained,which effectively improves the conductivity and stability of lithium iron phosphate in the electrolyte.

关 键 词：超临界流体 纳米粒子 粒度分布 碳包覆 油胺 磷酸铁锂 

分 类 号：TQ131.11[化学工程—无机化工]