Li_(4)Ti_(5)O_(12)材料的固相法制备及其煅烧温度  

Preparation of Li_(4)Ti_(5)O_(12) by Solid-State Method and Exploration of Calcination Temperature

作　　者：龙芮涞 吴显明[1] 吴秀婷 尹偲硕 LONG Ruilai;WU Xianming;WU Xiuting;YIN Caishuo(College of Chemistry and Chemical Engineering,Jishou University,Jishou 416000,Hunan China)

机构地区：[1]吉首大学化学化工学院,湖南吉首416000

出　　处：《吉首大学学报（自然科学版）》2022年第3期72-78,共7页Journal of Jishou University(Natural Sciences Edition)

基　　金：国家自然科学基金资助项目(51762016)。

摘　　要：以Li_(2)CO_(3),TiO_(2)为原料,无水乙醇为分散剂,采用高温固相法,通过两步煅烧方式制备出不同煅烧温度下的Li_(4)Ti_(5)O_(12)粉末材料.采用X射线衍射(XRD)、扫描电镜(SEM)表征材料的结构和形貌,采用恒电流充放电、交流阻抗和循环伏安等方法测试材料电化学性能.结果表明:在800℃下煅烧6 h后可得到晶型完整的纯相Li_(4)Ti_(5)O_(12),其颗粒均匀分布在200~400 nm.Li_(4)Ti_(5)O_(12)在0.5C倍率下首次可逆比容量为157.67 mA·h/g,库伦效率为96.1%,经过100次循环充放电后容量保持率为98.63%;在5C倍率下首次可逆比容量为107.0 mA·h/g,经过1000次循环充放电后容量保持率为84.1%.Li_(4)Ti_(5)O_(12) powders were prepared by solid-state reaction and two-step calcination method with Li_(2)CO_(3) and TiO_(2) as starting materials and anhydrous ethanol as dispersant.The microstructure and morphology of the materials were characterized by X-ray diffraction(XRD)and scanning electron microscopy(SEM).The electrochemical properties of the materials were tested by constant current charge-discharge,AC impedance and cyclic voltammetry.The results show that the pure phase Li_(4)Ti_(5)O_(12) with complete crystal structure could be synthesized after calcination at 800℃for 6h,and uniform dispersion with particle size of 200~400 nm.The first reversible specific capacity of the Li_(4)Ti_(5)O_(12) sample was 157.67 mA·h/g at the rate of 0.5 C,and the coulombic efficiency was 96.1%,the capacity retention was 94.3%after 100 cycles.The first reversible specific capacity was 107.0 mA·h/g at the rate of 0.5C,the coulombic efficiency was 96.1%and capacity retention was 84.1%after 1000 cycles.

关 键 词：固相法 钛酸锂 锂离子电池 负极材料 

分 类 号：TQ152[化学工程—电化学工业]