钛酸锂纳米颗粒的可控制备及其电化学性能研究
发布时间：2019-02-13 20:06
【摘要】：锂离子电池是目前综合性能最好的二次电池之一。本文采用溶剂热法制备钛酸锂纳米颗粒,系统研究了前驱体钛锂比、溶剂热温度与煅烧温度对材料结构的影响。利用X射线衍射仪(XRD)、透射电子显微镜(TEM)和恒电流充放电测试仪对尖晶石型钛酸锂的晶型、形貌结构和电化学性能进行分析。研究表明,煅烧温度对尖晶石型钛酸锂的合成起主要作用。当煅烧温度为800℃时,制得的样品粒径均一,具有较高结晶度和纯度的Li_4Ti_5O_(12)相;3C时首次放电比容量为107 m Ah/g,经过100次循环后,比容量仍达到为70 mAh/g,每次循环衰减率小于0.35%,且50个循环后库伦效率稳定并接近100%,展现出较好的大倍率充放电性能和循环稳定性能。
[Abstract]:Lithium ion battery is one of the best secondary batteries. In this paper, lithium titanate nanoparticles were prepared by solvothermal method. The effects of the ratio of titanium to lithium precursor, solvothermal temperature and calcination temperature on the structure of the materials were systematically studied. X-ray diffractometer (XRD),) transmission electron microscope (TEM) and constant current charge-discharge tester were used to analyze the crystal morphology and electrochemical properties of spinel lithium titanate. The results show that calcination temperature plays an important role in the synthesis of spinel lithium titanate. When the calcination temperature is 800 鈩，
本文编号：2421817
[Abstract]:Lithium ion battery is one of the best secondary batteries. In this paper, lithium titanate nanoparticles were prepared by solvothermal method. The effects of the ratio of titanium to lithium precursor, solvothermal temperature and calcination temperature on the structure of the materials were systematically studied. X-ray diffractometer (XRD),) transmission electron microscope (TEM) and constant current charge-discharge tester were used to analyze the crystal morphology and electrochemical properties of spinel lithium titanate. The results show that calcination temperature plays an important role in the synthesis of spinel lithium titanate. When the calcination temperature is 800 鈩，
本文编号：2421817
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