摘要
采用葡萄糖为有机碳源对钛酸锂进行碳包覆改性,利用水热法合成不同碳含量的Li4Ti5O12@C复合材料。利用XRD、SEM、TEM等对复合材料进行结构表征,并用恒流充放电测试方法和EIS对复合材料进行电化学性能测试。实验结果表明,Li4Ti5O12颗粒分布均匀并且被非晶碳层均匀包覆,适当的碳含量可以有效缓解钛酸锂的团聚现象。在0.1 A/g电流密度下,碳含量为7.5%的复合材料的首次放电比容量为225 mAh/g,经过200次循环后放电比容量仍保持稳定(193 mAh/g),库伦效率为99.9%,该复合材料表现出优异的倍率性能和循环稳定性。
In this paper,the carbon coating modification of lithium titanate was carried out by using glucose as the organic carbon source.The Li4Ti5O12@C composite was synthesized by hydrothermal method.The structure of the composite was characterized by XRD,SEM and TEM.The constant current charge and discharge test method and EIS were used to test the electrochemical performance of composite materials.The experimental results show that Li4Ti5O12 particles are uniformly distributed and uniformly coated by amorphous carbon layer.Proper carbon content can effectively alleviate the Li4Ti5O12 agglomeration.The first discharge specific capacity of the composite with 7.5%carbon content is 225 mAh/g at 0.1 A/g.After 200 cycles,the discharge specific capacity remains stable at 193 mAh/g,and the Coulomb efficiency is 99.9%.The composite shows excellent rate performance and cycle stability.
作者
王鸣
黄俊涛
程丽丽
周律法
任亚航
王学雷
WANG Ming;HUANG Juntao;CHENG Lili;ZHOU Lyufa;REN Yahang;WANG Xuelei(School of Materials Science and Engineering,Liaoning Technical University,Fuxin 123000,China)
出处
《材料导报》
EI
CAS
CSCD
北大核心
2020年第S02期19-23,共5页
Materials Reports
基金
国家自然科学基金项目(51874167)
辽宁省自然科学基金材料联合基金(20180510034)。
关键词
锂离子电池
钛酸锂
负极材料
碳包覆
lithium ion battery
lithium titanate
anode material
carbon coating
