标题：Carbon Coating and Zn2+ Doping of Magnetite Nanorods for Enhanced Electrochemical Energy Storage
作者：Hu, Chenxi; Guo, Shimei; Lu, Guixia; Fu, Ya; Liu, Jiurong; Wei, Huige; Yan, Xingru; Wang, Yiran; Guo, Zhanhu
作者机构：[Hu, C] Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials, Ministry of Education, Shandong University, Jinan, Shandong, 更多
通讯作者地址：[Liu, JR]Shandong Univ, Minist Educ, Key Lab Liquid Solid Struct Evolut & Proc Mat, Jinan 250061, Shandong, Peoples R China.
关键词：magnetite nanorods; carbon coating; Zn2+-doping; cycling stability; rate; capability
摘要：Zn2+-doped magnetite (Fe3O4) nanorods with carbon coating of controllable thickness (Zn-Fe3O4@C) were prepared from lab-made Zn2+-doped Fe2O3 nanorods which were simultaneously coated with and reduced by carbon during the carbonization process using pyrrole as the carbon precursor. The asprepared Zn-Fe3O4@ C nanocomposites were evaluated as anode materials for lithium-ion batteries (LIBs). The results show that the Zn-Fe3O4@C nanorods with 2.5 mol% Zn2+ doping demonstrated a reversible capacity of 949.1 mAh g (1), compared to only 315.4 and 235.5 mAh g (1) for Fe2O3 and Fe3O4@C nanorods, respectively, after 60 cycles at a current density of 100 mA g (1). The Zn-Fe3O4@C nanocomposite electrodes also exhibited better cycling and rate performances than the corresponding Fe2O3 and Fe3O4@C nanorods. The superior performances witnessed in Zn-Fe3O4@C are attributed to the Zn2+ doping and the carbon coating, which have efficiently enhanced the electrical conductivity and lithium ion diffusion. (C) 2014 Elsevier Ltd. All rights reserved.