摘要
采用喷雾干燥与高温煅烧相结合的方法制备了球形LiTi2(PO4)3/C复合水系负极材料,探讨了基于不同包覆机制的有机碳源和碳包覆量对LiTi2(PO4)3/C复合负极电化学性能的影响.结果表明,碳包覆量过低时不足以阻止水的侵蚀,而碳含量过高时锂离子扩散的阻力过大,磷酸钛锂电极最优碳包覆质量分数为13%.碳包覆的均匀性和包覆层厚度是影响电极性能的两个重要因素.基于原位聚合包覆机制的聚多巴胺包覆磷酸钛锂颗粒最均匀,碳化后微晶结构较好,具有良好的电子导电性,以聚多巴胺为碳源制备的LiTi2(PO4)3/C复合负极性能最优.
Spherical LiTi2(PO4)3/C composites were prepared through spray drying method followed by high-temperature calcination and used as anodes for aqueous lithium ion batteries.The effect of different organic carbon source based on different coating mechanisms and carbon content on the electrochemical properties of LiTi2(PO4)3/C composite anodes were investigated.Results show that if the amount of carbon coating is too low,it cannot prevent water from eroding.In contrast,if the amount of carbon coating is too high,the resis-tance of lithium ion diffusion will be high.So the optimal carbon coating amount of LiTi2(PO4)3/C electrodes is 13%.The uniformity of carbon coating and the thickness of coating layer are the two main factors affecting the performance of coated electrodes.The polydopamine-coated lithium titanium phosphate particles based on the in-situ polymerization coating mechanism are the most uniform,and the microcrystalline structure and electronic conductivity after carbonization is better.The best performance is achieved by LiTi2(PO4)3/C anodes prepared by using polydopamine as the carbon source.
作者
张晨阳
文越华
赵鹏程
程杰
邱景义
孙艳芝
ZHANG Chenyang;WEN Yuehua;ZHAO Pengcheng;CHENG Jie;QIU Jingyi;SUN Yanzhi(National Fundamental Research Laboratory of New Hazardous Chemicals Assessment and Accident Analysis,Beijing University of Chemical Technology,Beijing 100029,China;Research Institute of Chemical Defense Institution,Beijing 100191,China)
出处
《高等学校化学学报》
SCIE
EI
CAS
CSCD
北大核心
2020年第6期1352-1361,共10页
Chemical Journal of Chinese Universities
基金
国家重点研发计划项目(批准号:SQ2016YFGX100026)资助.
作者简介
联系人:文越华,女,博士,研究员,主要从事化学电源及其关键材料研究.E-mail:wen_yuehua@126.com;联系人:孙艳芝,女,博士,教授,主要从事电化学研究.E-mail:sunyz@mail.buct.edu.cn。
