摘要
通过高温固相法,选择不同的焙烧温度、焙烧时间、锂源过量比例(质量比)及研磨方式、焙烧程序等合成条件,研究了制备纯相Li_4Ti_5O_(12)的最适合条件.结果表明:多次研磨和1次焙烧有助于制备较纯产物,焙烧温度和焙烧时间对产物的纯度有一定影响,锂源过量比例对产物纯度影响较大.通过XRD分析,当锂源过量8%时,产物在2θ=20.5°处有杂峰(Li_2TiO_3),主峰(2θ=43.4°)略有分裂(LiTiO_2);当锂源过量5%时,产物基本为纯相Li_4Ti_5O_(12)杂峰消失.研究表明制备纯相Li_4Ti_5O_(12)最适合的实验条件为:锂源过量5%,焙烧温度800℃,焙烧时间12 h,反应物经过2次研磨,1次焙烧得到纯相Li_4Ti_5O_(12).
Li4Ti5O12 was prepared by a high temperature solid state routine with varied calcining temperature and time, excess lithium content, grinding method, and calcination process. The results show that several grinding processes and one-time calcining enhance the purity of the product; the calcining temperature and time have effects on the purity of the product of solid state reaction, and excess lithium content influence the purity of the product significantly. The impurity, （Li2TiO3）,was observed near 26=20. 5°and several multiple peaks attributed to LiTiO2 near 2θ=43. 4°were also observed in the XRD patterns under unsatisfactory conditions. Pure-phased Li4Ti5O12 was obtained when excess lithium mass content decreased from 8 % to 5 %. The results show that purephased LiTisO（12） can be produced at 800℃, time is 12 h, and excess lithium mass content of 5 %.
出处
《中南民族大学学报（自然科学版）》
CAS
2010年第4期1-4,共4页
Journal of South-Central University for Nationalities：Natural Science Edition
基金
中南民族大学自然科学基金资助项目(YZZ06028)
关键词
纯相Li4Ti5O12
高温固相反应
实验条件
pure-phased Li4Ti5O12
high temperature solid state routine
experimental conditions
