摘要
将TiNb2O7的前驱体在不同温度(400℃、800℃、900℃、1000℃和1100℃)煅烧,用固相合成法制备Ti Nb2O7负极材料并对其样品进行了TG-DSC、XRD和SEM表征和电化学性能测试。结果表明:在900℃煅烧前驱体,锐钛矿与Nb2O5反应的主要产物为Ti2Nb10O29。Ti2Nb10O29与金红石反应生成了TiNb2O7,生成纯单斜相Ti Nb2O7的最佳条件为在1100℃煅烧6 h。TiNb2O7负极材料在0.2C电流密度时初始容量为278.4 mAh/g,初始库伦效率为82.9%。TiNb2O7具有良好的倍率容量,在1C循环100次后容量保持率为89%。
The precursor of TiNb2O7 is prepared via solid-phase synthesis with anatase and Nb2O5 as raw materials and then calcinated at 400℃, 800℃, 900℃, 1000℃ and 1100℃ respectively in air to prepare TiNb2O7 as electrode materials. The prepared materials are characterized by means of thermogravimetric analyzer, differential scanning calorimetry(TG-DSC), X-ray diffraction(XRD), scanning electron microscopy(SEM) and electrochemical test. The results show that the main reaction products of anatase and Nb2O5 at 900℃ is Ti2Nb10O29. Ti Nb2O7 is obtained by the reaction of Ti2 Nb10O29 and rutile. The optimum calcination condition of pure monoclinic Ti Nb2O7 is 1100℃ for 8 h. TiNb2 O7 anode material has an initial capacity of 278.4 mAh/g at 0.2 C and the initial coulombic efficiency is 82.9%. In the meantime,TiNb2O7 has a good rate capacity, which can still reach 89% after 100 cycles at 1 C rate.
作者
谢礼兰
杨冬升
凌静
XIE Lilan;YANG Dongsheng;LING Jing(School of Materials and Architectural Engineering,Guizhou Normal University,Guiyang 550001,China)
出处
《材料研究学报》
EI
CAS
CSCD
北大核心
2020年第5期385-391,共7页
Chinese Journal of Materials Research
基金
贵州省科技厅-贵州师范大学联合基金(LKS[2009]30)。
关键词
材料合成与加工工艺
锂离子电池
固相法
TiNb2O7
电化学性能
synthesizing and processing technics for materials
lithium-ion battery
solid-phase synthesis
TiNb2O7
electrochemical performance
