首页 | 官方网站   微博 | 高级检索  
     

共聚物模板辅助合成高倍率性能多孔Li2FeSiO4@C/CNTs纳米复合正极材料
引用本文:苟蕾,赵坤,毛一洋,谢荣,樊小勇,李东林,马守龙,田苗.共聚物模板辅助合成高倍率性能多孔Li2FeSiO4@C/CNTs纳米复合正极材料[J].无机化学学报,2015,31(12):2401-2410.
作者姓名:苟蕾  赵坤  毛一洋  谢荣  樊小勇  李东林  马守龙  田苗
作者单位:长安大学材料科学与工程学院, 新能源材料与器件研究所, 西安 710061,长安大学材料科学与工程学院, 新能源材料与器件研究所, 西安 710061,长安大学材料科学与工程学院, 新能源材料与器件研究所, 西安 710061,长安大学材料科学与工程学院, 新能源材料与器件研究所, 西安 710061,长安大学材料科学与工程学院, 新能源材料与器件研究所, 西安 710061,长安大学材料科学与工程学院, 新能源材料与器件研究所, 西安 710061,长安大学材料科学与工程学院, 新能源材料与器件研究所, 西安 710061,长安大学材料科学与工程学院, 新能源材料与器件研究所, 西安 710061
基金项目:国家自然科学基金(No.21073021,21473014,21103013),教育部科技创新工程重大项目培育资金(No.708084),中央高校基础研究经费 (No.0009-2014G1311085)资助项目。
摘    要:通过溶胶-凝胶法制备了Li2FeSiO4@C/CNTs(LFS@C/CNTs)纳米复合材料,其中三嵌段共聚物P123用作结构导向剂和碳源,碳纳米管作为导电线提高材料的导电性。LFS@C/CNTs不仅具有海绵状纳米孔,能够与电解液充分接触改善锂离子的传输路径,同时由非晶碳和碳纳米管构成的三维桥联导电网络利于电子的快速传递,提高了材料大电流充放电能力和循环稳定性。复合后的LFS@C/CNTs的高倍率性能相比LFS@C明显提高, 当CNTs的掺量为4%,电压窗口为1.5~4.5 V,0.1C电流密度下放电比容量为182 mAh·g-1。在10C经70次循环后该材料的放电比容量能保持在117 mAh·g-1,是LFS@C放电比容量(55 mAh·g-1)的两倍。

关 键 词:Li2FeSiO4  复合材料  碳纳米管  锂离子电池  倍率性能
收稿时间:2015/7/10 0:00:00
修稿时间:2015/8/14 0:00:00

Copolymer Template-Assisted Synthesis of Porous Li2FeSiO4@C/CNTs Nanocomposite as Cathode Material with High Rate Capability
GOU Lei,ZHAO Kun,MAO Yi-Yang,XIE Rong,FAN Xiao-Yong,LI Dong-Lin,MA Shou-Long and TIAN Miao.Copolymer Template-Assisted Synthesis of Porous Li2FeSiO4@C/CNTs Nanocomposite as Cathode Material with High Rate Capability[J].Chinese Journal of Inorganic Chemistry,2015,31(12):2401-2410.
Authors:GOU Lei  ZHAO Kun  MAO Yi-Yang  XIE Rong  FAN Xiao-Yong  LI Dong-Lin  MA Shou-Long and TIAN Miao
Affiliation:New Energy Materials and Device Group, School of Materials Science and Engineering, Changan University, Xian, 710061, China,New Energy Materials and Device Group, School of Materials Science and Engineering, Changan University, Xian, 710061, China,New Energy Materials and Device Group, School of Materials Science and Engineering, Changan University, Xian, 710061, China,New Energy Materials and Device Group, School of Materials Science and Engineering, Changan University, Xian, 710061, China,New Energy Materials and Device Group, School of Materials Science and Engineering, Changan University, Xian, 710061, China,New Energy Materials and Device Group, School of Materials Science and Engineering, Changan University, Xian, 710061, China,New Energy Materials and Device Group, School of Materials Science and Engineering, Changan University, Xian, 710061, China and New Energy Materials and Device Group, School of Materials Science and Engineering, Changan University, Xian, 710061, China
Abstract:Li2FeSiO4@C/CNTs (LFS@C/CNTs) nanocomposite was synthesized by a sol-gel method. A triblock copolymer P123 was used as the direction agent for nanopores and carbon source, and carbon nanotubes were used as conductive wires to further increase the conductivity of the material. The resulting LFS@C/CNTs nanocomposite possesses not only a nanoporous sponge-like structure for improving Li-ions transport by means of liquid electrolyte, but also a 3D self-bridged conduction hybrid network consisted of amorphous carbon coating and graphitized CNTs for electron fast transport that ultimately improves the high rate capability and cycling performance. As a result, the porous LFS@C/CNTs nanocomposite compared with nanoporous LFS@C exhibits a remarkable improvement in high-rate capability. The LFS@C/CNTs nanocomposite with 4wt% of CNTs delivers a specific discharge capacity of approximately 182 mAh·g-1 at 0.1C in the voltage window of 1.5~4.5 V, and the specific discharge capacity at 10C after 70 cycles maintains at 117 mA·h·g-1, which is more than two times that of LFS@C (55 mAh·g-1) as a cathode material for high power lithium ion battery.
Keywords:Li2FeSiO4  composite materials  carbon nanotube  lithium ion battery  rate performance
点击此处可从《无机化学学报》浏览原始摘要信息
点击此处可从《无机化学学报》下载全文
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司    京ICP备09084417号-23

京公网安备 11010802026262号