Unprecedented and highly stable lithium storage capacity of(001)faceted nanosheet-constructed hierarchically porous TiO2/rGO hybrid architecture for high-performance Li-ion batteries  

作　　者：Wen-Bei Yu Zhi-Yi Hu Jun Jin Min Yi Min Yan Yu Li Hong-En Wang Huan-Xin Gao Li-Qiang Mai Tawfique Hasan Bai-Xiang Xu Dong-Liang Peng Gustaaf Van Tendeloo Bao-Lian Su 

机构地区：[1]State Key Laboratory of Advanced Technology for Materials Synthesis and Processing,Wuhan,University of Technology,Wuhan 430070,China [2]Cambridge Graphene Centre,University of Cambridge,Cambridge CB30FA,UK [3]Nanostructure Research Centre,Wuhan University of Technology,Wuhan 430070,China [4]Faculty of Materials Science and Chemistry,China University of Geosciences,Wuhan 430074,China [5]Institute of Materials Science,Technische Universitat Darmstadt,Darmstadt 64287,Germany [6]Fundamental Research Department,SINOPEC Shanghai Research Institute of Petrochemical Technology,Shanghai 201208,China [7]Department of Materials Science and Engineering,College of Materials,Xiamen University,Xiamen 361005,China [8]Electron Microscopy for Materials Science,University of Antwerp,Antwerp B-2020,Belgium [9]Laboratory of Inorganic Materials Chemistry,University of Namur,Namur B-5000,Belgium

出　　处：《National Science Review》2020年第6期1046-1058,共13页国家科学评论（英文版）

基　　金：This work was supported by the National Key R&D Program of China(2016YFA0202602 and 2016YFA0202603);the National Natural Science Foundation of China(U1663225);Program for Changjiang Scholars and Innovative Research Team in University(IRT 15R52).

摘　　要：Active crystal facets can generate special properties for various applications.Herein,we report a(001)faceted nanosheet-constructed hierarchically porous TiO2/r GO hybrid architecture with unprecedented and highly stable lithium storage performance.Density functional theory calculations show that the(001)faceted TiO2 nanosheets enable enhanced reaction kinetics by reinforcing their contact with the electrolyte and shortening the path length of Li+diffusion and insertion-extraction.The reduced graphene oxide(r GO)nanosheets in this TiO2/rGO hybrid largely improve charge transport,while the porous hierarchy at different length scales favors continuous electrolyte permeation and accommodates volume change.This hierarchically porous TiO2/r GO hybrid anode material demonstrates an excellent reversible capacity of 250 mAh g^-1 at 1 C(1 C=335 mA g^-1)at a voltage window of 1.0-3.0 V.Even after 1000 cycles at 5 C and 500 cycles at 10 C,the anode retains exceptional and stable capacities of 176 and 160 m Ah g^-1,respectively.Moreover,the formed Li2 Ti2 O4 nanodots facilitate reversed Li+insertion-extraction during the cycling process.The above results indicate the best performance of TiO2-based materials as anodes for lithium-ion batteries reported in the literature.

关 键 词：(001)faceted TiO2 nanosheets reduced graphene oxide porous hierarchy unprecedented lithium storage capacity Li2Ti2O4 crystallites 

分 类 号：TM912[电气工程—电力电子与电力传动] TB383.1[一般工业技术—材料科学与工程]