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Ultrathin 2D Mesoporous TiO 2 /rGO Heterostructure for High‐Performance Lithium Storage
Author(s) -
Liang Yaru,
Xiong Xiang,
Xu Zhuijun,
Xia Qingbing,
Wan Liyang,
Liu Rutie,
Chen Guoxin,
Chou ShuLei
Publication year - 2020
Publication title -
small
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.785
H-Index - 236
eISSN - 1613-6829
pISSN - 1613-6810
DOI - 10.1002/smll.202000030
Subject(s) - materials science , mesoporous material , graphene , heterojunction , anode , lithium (medication) , chemical engineering , diffusion barrier , titanium dioxide , nanotechnology , current density , layer (electronics) , optoelectronics , electrode , composite material , chemistry , quantum mechanics , endocrinology , medicine , biochemistry , physics , engineering , catalysis
Lithium‐ion batteries (LIBs) have been widely applied and studied as an effective energy supplement for a variety of electronic devices. Titanium dioxide (TiO 2 ), with a high theoretical capacity (335 mAh g −1 ) and low volume expansion ratio upon lithiation, has been considered as one of the most promising anode materials for LIBs. However, the application of TiO 2 is hindered by its low electrical conductivity and slow ionic diffusion rate. Herein, a 2D ultrathin mesoporous TiO 2 /reduced graphene (rGO) heterostructure is fabricated via a layer‐by‐layer assembly process. The synergistic effect of ultrathin mesoporous TiO 2 and the rGO nanosheets significantly enhances the ionic diffusion and electron conductivity of the composite. The introduced 2D mesoporous heterostructure delivers a significantly improved capacity of 350 mAh g −1 at a current density of 200 mA g −1 and excellent cycling stability, with a capacity of 245 mAh g −1 maintained over 1000 cycles at a high current density of 1 A g −1 . The in situ transmission electron microscopy analysis indicates that the volume of the as‐prepared 2D heterostructures changes slightly upon the insertion and extraction of Li + , thus contributing to the enhanced long‐cycle performance.