文献类型：期刊文献

英文题名：High performance of mesoporous γ-Fe2O3 nanoparticle/Ketjen Black composite as anode material for lithium ion batteries

作者：Dong, Hui[1];Xu, Yunlong[1];Ji, Mandi[1];Zhang, Huang[1];Zhao, Zhen[1];Zhao, Chongjun[1]

机构：[1]E China Univ Sci & Technol, Minist Educ, Key Lab Ultrafine Mat, Shanghai Key Lab Adv Polymer Mat,Sch Mat Sci & En, Shanghai 200237, Peoples R China

年份：2015

卷号：151

起止页码：118

外文期刊名：ELECTROCHIMICA ACTA

收录：;EI(收录号：20144800262886);WOS:【SCI-EXPANDED(收录号:WOS:000346832700016)】；

基金：This work is supported by Shanghai Leading Academic Discipline Project (B502), Shanghai Nanotechnology Special Foundation (No. 11nm0500900) and Shanghai Key Laboratory Project (08DZ2230500).

语种：英文

外文关键词：gamma-Fe2O3; Ketjen Black; mesoporous; ultrahigh capacity; rate capability

摘要：A type of gamma-Fe2O3 nanoparticle/Ketjen Black (KB) composite material is synthesized by a solvothermal method combined with precursor thermal transformation. The structure and morphology are characterized by XRD, raman spectra, TG, nitrogen sorption, SEM, TEM and EDS. The results show that the composite has a uniform nanoporous network and well-dispersed gamma-Fe2O3 particles with a size of ca. 5 nm are embedded in the mesopores of KB. The gamma-Fe2O3/KB exhibits superior eletrochemical performances to the bare gamma-Fe2O3, especially at high current rate. The discharge capacity of the composite is 1100 mAh.g(-1) at the first cycle and remains 988.8 mAh.g(-1) after 100 cycles at 0.2 degrees C. Moreover, it also maintains a high discharge capacity of 697.8 mAh.g(-1) at 2 degrees C and 410.1 mAh .g(-1) at 5 degrees C after 100 cycles, respectively. Such improved electrochemical performances could be attributed to the superior conductivity and favorable structure of KB, which contributes to the improvement in electronic conductivity and structure stability of gamma-Fe2O3 during the lithium ion insertion/desertion process. (C) 2014 Elsevier Ltd. All rights reserved.