熔盐辅助固相法制备尖晶石型钛酸锂  

Synthesis and electrochemical performance of spinel Li_4Ti_5O_(12) by molten salt-assisted solid-state method

作　　者：高利亭 唐致远[1] 张新河 王浩[1] 

机构地区：[1]天津大学化工学院,天津300072 [2]东莞市迈科科技有限公司,广东东莞523800

出　　处：《电源技术》2015年第3期458-460,共3页Chinese Journal of Power Sources

基　　金：国家自然科学基金(20973124)

摘　　要：以低温共熔锂盐0.38 LiOH·H2O-0.62 LiNO3为锂源和熔盐,纳米锐钛矿Ti O2为钛源,通过熔盐辅助固相法制备纳米Li4Ti5O12。采用X射线衍射(XRD)、扫描电镜(SEM)和电化学性能测试研究了800℃热处理时间对Li4Ti5O12产物的结构、形貌和电化学性能的影响。结果表明:前驱体经预烧、压片,800℃热处理1 h后所得产物表现出优异的倍率性能,1 C下其比容量为152.7 m Ah/g,5 C下其比容量为139.8 m Ah/g,特别是在10 C高倍率下仍然具有127 m Ah/g的放电比容量。与传统固相法相比,该方法不仅能耗低,而且产物的电化学性能优良,非常适用于产业化生产钛酸锂。Using rutile-Ti O2 and eutectic mixture of LiOH·H2O and LiNO3 as the raw materials, high-performance Li4Ti5O12 was successfully fabricated by an easily molten salt-assisted solid-state method. Based on the analysis on X-ray diffraction（XRD）, scanning electron microscopy（SEM） and electrochemical measurements, the influence of the high temperature（800 ℃） calcination time was discussed. The sample Li4Ti5O12 with high temperature calcination time for 1 h exhibited excellent electrochemical performances. The as-prepared product delivered the capacities of152.7, 139.8 and 127 m Ah/g at 1 C, 5 C and 10 C, respectively. Compared with the conventional soli-state method,this method had highly shortened the energy consumption. Hence, great potential was exhibited for the manufacture of Li4Ti5O12 powder with superior high-power performance.

关 键 词：锂离子电池 负极材料 钛酸锂 熔盐 电化学性能 

分 类 号：TM912[电气工程—电力电子与电力传动]