用于锂离子电池负极的钛酸锂/石墨烯筛复合材料制备及电化学性能  

Preparation and Electrochemical Performance of LiTiO/Graphene Nanomesh Composite as Anode Material in Lithium-Ion Batteries

作　　者：徐世伟 夏童 李刚 赵洋 胡南滔 Xu Shiwei;Xia Tong;Li Gang;Zhao Yang;Hu Nantao(Key Laboratory of Thin Film and Micro Technology of Ministry of Education,School of Electronic Information and Electrical Engineering,Shanghai Jiao Tong University,Shanghai 200240,China;Key Laboratory of Artificial Structures and Quantum Control,School of Physics and Astronomy,Shanghai Jiao Tong University,Shanghai 200240,China)

机构地区：[1]上海交通大学电子信息与电气工程学院薄膜与微细技术教育部重点实验室,上海200240 [2]上海交通大学物理与天文学院人工结构与量子控制重点实验室,上海200240

出　　处：《微纳电子技术》2021年第6期476-483,共8页Micronanoelectronic Technology

基　　金：上海市自然科学基金资助项目(17ZR1414100)。

摘　　要：利用微波辅助刻蚀法制备了多孔石墨烯筛(MHGO),然后通过简单的高温固相法合成了具有MHGO镶嵌的钛酸锂-多孔石墨烯筛(LTO-MHGO)复合材料。采用X射线衍射仪(XRD)、Raman光谱仪以及扫描电子显微镜(SEM)等对制备的材料进行成分分析和结构表征。结果表明,所制备的LTO-MHGO复合材料在5 C(1 C=175 mA/g)倍率的电流密度下具有较好的循环稳定性,循环2000次后仍保持142.6 mA·h/g的可逆容量。在20 C倍率的电流密度下,初次放电比容量达到170.2 mA·h/g,循环500次后可逆容量仍维持在122 mA·h/g。相比于未掺杂的钛酸锂,所制备的LTO-MHGO倍率性能和长期循环性能得到大幅提升。The multi-level hole graphene oxide(MHGO)was prepared by microwave-assisted etching method.Then the lithium titanate-multi-level hole graphene oxide(LTO-MHGO)composites with MHGO inserted were prepared by a simple high-temperature solid phase method.The composition analysis and structure characterization of the prepared materials were carried out by X-ray diffractometer(XRD),Raman spectrometer and scanning electron microscope(SEM).The results show that the prepared LTO-MHGO composites have good cyclic stability at a current density of 5 C(1 C=175 mA/g),a reversible capacity of 142.6 mA·h/g is maintained after 2000 cycles.At a current density of 20 C,the initial discharge specific capacity reaches 170.2 mA·h/g,and the reversible capacity remains at 122 mA·h/g after 500 cycles.Compared with the undoped LTO,the rate performance and long-term cycle performance of the prepared LTO-MHGO have been greatly improved.

关 键 词：钛酸锂(LTO) 石墨烯 多孔结构 锂离子电池(LIB) 高倍率 

分 类 号：TB33[一般工业技术—材料科学与工程] TM99[电气工程—电力电子与电力传动]