Ultrathin 2D Mesoporous TiO2/rGO Heterostructure for High ‐Performance Lithium Storage

2D ultrathin mesoporous TiO2/rGO heterostructure is fabricated after heat treatment of the coprecipitated single ‐layered Ti3O72 −/GO nanosheet. Owing to the ultrathin mesoporous characteristics and the enhanced ionic and electron conductivity, the resulting 2D ultrathin mesoporous heterostructures can deliver an extremely high lithium storage capacity and excellent cycling stability at high current density. AbstractLithium ‐ion batteries (LIBs) have been widely applied and studied as an effective energy supplement for a variety of electronic devices. Titanium dioxide (TiO2), 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 TiO2 is hindered by its low electrical conductivity and slow ionic diffusion rate. Herein, a 2D ultrathin mesoporous TiO2/reduced graphene (rGO) heterostructure is fabricated via a layer ‐by‐layer assembly process. The synergistic effect of ultrathin mesoporous TiO2 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 ...

Source: Small - July 1, 2020 Category: Nanotechnology Authors: Yaru Liang, Xiang Xiong, Zhuijun Xu, Qingbing Xia, Liyang Wan, Rutie Liu, Guoxin Chen, Shu ‐Lei Chou Tags: Full Paper Source Type: research