摘要
以钛酸四丁酯、醋酸锂、柠檬酸和竹炭为原料,采用两步煅烧和溶胶-凝胶法制备了锂离子电池Li_(4)Ti_(5)O_(12)/C负极材料。采用XRD、SEM表征了材料的微观结构和形貌。采用恒流充放电、交流阻抗法和循环伏安法测试了材料的电化学性能。结果显示,Li_(4)Ti_(5)O_(12)/C具有良好的结晶度,颗粒表面光滑,分散均匀,粒径为200~300 nm。10 C倍率下,Li_(4)Ti_(5)O_(12)/C的首次放电比容量为180.4 mA·h/g,循环300圈后为167.5 mA·h/g,容量保持率为92.8%,远高于Li_(4)Ti_(5)O_(12)的46.9%。在20 C大倍率下,Li_(4)Ti_(5)O_(12)/C和Li_(4)Ti_(5)O_(12)的容量保持率分别为68.9%和41.3%。
Li_(4)Ti_(5)O_(12)/C anode materials for lithium-ion batteries were prepared by two-step calcination and sol-gel method using tetrabutyl titanate,lithium acetate,citric acid and bamboo charcoal as starting materials.The microstructure and morphology of the materials were characterized by XRD and SEM.The electrochemical properties of the materials were tested by constant current charge discharge,AC impedance and cyclic voltammetry.The results showed that Li_(4)Ti_(5)O_(12)/C had good crystallinity,smooth surface and uniform dispersion with particle size of 200~300 nm.The first discharge specific capacity of Li_(4)Ti_(5)O_(12)/C was 180.4 mA·h/g at 10 C rate,and 167.5 mA·h/g after 300 cycles.The capacity retention rate was 92.8%,much higher than that of Li_(4)Ti_(5)O_(12)(46.9%).At 20 C rate,the capacity retention rates of Li_(4)Ti_(5)O_(12)/C and Li_(4)Ti_(5)O_(12)were 68.9%and 41.3%,respectively.
作者
刘晶丽
陈上
吴显明
王芝茹
张枫
龙芮涞
LIU Jingli;CHEN Shang;WU Xianming;WANG Zhiru;ZHANG Feng;LONG Ruilai(College of Chemistry and Chemical Engineering,Jishou University,Jishou 416000,Hunan,China;Xiangxi Ores Minerals and New Materials Development and Service Center,Jishou 416000,Hunan,China)
出处
《精细化工》
EI
CAS
CSCD
北大核心
2021年第2期306-309,322,共5页
Fine Chemicals
基金
国家自然科学基金(51762016)。
