【摘要】：鋰離子電池是目前綜合性能最好的二次電池之一。本文采用溶劑熱法制備鈦酸鋰納米顆粒,系統(tǒng)研究了前驅(qū)體鈦鋰比、溶劑熱溫度與煅燒溫度對材料結(jié)構(gòu)的影響。利用X射線衍射儀(XRD)、透射電子顯微鏡(TEM)和恒電流充放電測試儀對尖晶石型鈦酸鋰的晶型、形貌結(jié)構(gòu)和電化學(xué)性能進(jìn)行分析。研究表明,煅燒溫度對尖晶石型鈦酸鋰的合成起主要作用。當(dāng)煅燒溫度為800℃時,制得的樣品粒徑均一,具有較高結(jié)晶度和純度的Li_4Ti_5O_(12)相;3C時首次放電比容量為107 m Ah/g,經(jīng)過100次循環(huán)后,比容量仍達(dá)到為70 mAh/g,每次循環(huán)衰減率小于0.35%,且50個循環(huán)后庫倫效率穩(wěn)定并接近100%,展現(xiàn)出較好的大倍率充放電性能和循環(huán)穩(wěn)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，

本文編號：2421817