标题：Sandwich-structured nanocomposites of N-doped graphene and nearly monodisperse Fe3O4 nanoparticles as high-performance Li-ion battery anodes
作者：Qi Wen;Li Xuan;Li Hui;Wu Weikang;Li Pei;Wu Ying;Kuang Chunjiang;Zhou Shaoxiong;Li Xiaolin
作者机构：[Qi, W] Beijing Key Laboratory of Energy Nanomaterials, Advance Technology & Materials Co., Ltd, China Iron & Steel Research Institute Group, Beijing, 更多
通讯作者地址：[Zhou, SX]Adv Technol & Mat Co Ltd, Beijing Key Lab Energy Nanomat, China Iron & Steel Res Inst Grp, Beijing 100081, Peoples R China;[Li, XL]Pacific N 更多
关键词：N-doped graphene;iron oxides;self-assembly;Li-ion battery;density functional theory
摘要：Iron oxides have attracted considerable interest as abundant materials for high-capacity Li-ion battery anodes.However,their fast capacity fading owing to poorly controlled reversibility of the conversion reactions greatly hinders their application.Here,a sandwich-structured nanocomposite of N-doped graphene and nearly monodisperse Fe3O4 nanoparticles were developed as high-performance Li-ion battery anode.N-doped graphene serves as a conducting framework for the self-assembled structure and controls Fe3O4 nucleation through the interaction of N dopants,surfactant molecules,and iron precursors.Fe3O4 nanoparticles were well dispersed with a uniform diameter of ～15 rn.The unique sandwich structure enables good electron conductivity and Li-ion accessibility and accommodates a large volume change.Hence,it delivers good cycling reversibility and rate performance with a capacity of ～1,227 mA.h.g-1 and 96.8％ capacity retention over 1,000 cycles at a current density of 3 A.g-1.Our work provides an ideal structure design for conversion anodes or other electrode materials requiring a large volume change.