文献类型：期刊文献

英文题名：MXene interlayer anchored Fe3O4 nanocrystals for ultrafast Li-ion batteries

作者：Xu, Da[1,2];Ma, Kun[1];Chen, Ling[2];Hu, Yanjie[2];Jiang, Hao[1,2];Li, Chunzhong[1,2]

机构：[1]East China Univ Sci & Technol, Sch Chem Engn, Minist Educ, Key Lab Ultrafine Mat, Shanghai 200237, Peoples R China;[2]East China Univ Sci & Technol, Shanghai Engn Res Ctr Hierarch Nanomat, Sch Mat Sci & Engn, Shanghai 200237, Peoples R China

年份：2020

卷号：212

外文期刊名：CHEMICAL ENGINEERING SCIENCE

收录：;EI(收录号：20194807740317);WOS:【SCI-EXPANDED(收录号:WOS:000502034600033)】；

基金：This work was supported by the National Natural Science Foundation of China (21975074, 91534202, and 91834301), the Basic Research Program of Shanghai (17JC1402300), the Shanghai Scientific and Technological Innovation Project (18JC1410500), the National Program for Support of Top-Notch Young Professionals, and the Fundamental Research Funds for the Central Universities (222201718002).

语种：英文

外文关键词：Fe3O4 nanocrystals; MXene; 2D space confinement; High-rate; Li-ion batteries

摘要：Balancing energy density and charging rate has been identified as a great challenge for Li-ion batteries (LIBs), which mainly hinges on developing high-performance electrode materials. Herein, we have developed nove Fe3O4@Ti3C2 hybrids, in which the Fe3O4 nanocrystals are well-anchored between Ti 3 C 2 interlayers with the assistance of the synergistic effects of 2D physical confinement and Ti-O-Fe covalent bonds. Such structural design can address the dispersion and volume change of nanocrystals during continuous charge/discharge with the enhancement of structural stability and the exposure of abundant active sites for each component. Meantime, the charge polarization caused by the Ti-O-Fe covalent bonds greatly accelerates the lithiation reaction kinetics and electrons transfer. These advantages endow the Fe3O4@Ti3C2 hybrids with a very high specific capacity of 1172 mAh g(-1) and a rapid charging capability of 366 mAh g(-1) in 66 s. A 90% capacity retention can be maintained even through 1000 cycles at 5 A g(-1). More impressively, we can also achieve a free-standing electrode by a simple vacuum filtering, exhibiting a high areal capacity of 4.2 mAh cm(-2) at 4.4 mg cm(-2) almost without sacrificing gravimetric capacity. The present 2D confined strategy provides a new notion to construct satisfactory electrodes for energy storage. (C) 2019 Elsevier Ltd. All rights reserved.