Ultrathin nanobelts-assembled Chinese knot-like 3D TiO2 for fast and stable lithium storage
3D nanoarchitectures, ultrathin nanobelts, TiO2, lithium ion storage, ultrahigh rate battery
ABSTRACT Nanostructured TiO2 has applications in solar cells, photocatalysts, and fastcharging, safe lithium ion batteries (LIBs). To meet the demand of high-capacity and high-rate LIBs with TiO2-based anodes, it is important to fine-tune the nanoarchitecture using a well-controlled synthesis approach. Herein, we report a new approach that involves epitaxial growth combined with topotactic conversion to synthesize a unique type of 3D TiO2 nanoarchitecture that is assembled by well-oriented ultrathin nanobelts. The whole nanoarchitecture displays a 3D Chinese knot-like morphology; the core consists of robust perpendicular interwoven nanobelts and the shell is made of extended nanobelts. The nanobelts oriented in three perpendicular A directions facilitate Li+ penetration and diffusion. Abundant anatase/TiO2-B interfaces provide a large amount of interfacial pseudocapacitance. A high and stable capacity of 130 mA·h·g−1 was obtained after 3,000 cycles at 10 A·g−1 (50 C), and the high-rate property of our material was greater than that of many recently reported high-rate TiO2 anodes. Our result provides, not only a novel synthesis strategy, but also a new type of 3D anatase TiO2 anode that may be useful in developing long-lasting and fast-charging batteries.
Tsinghua University Press
Qili Wu,Shiman He,Xianfeng Yang,Jingling Yang,Gaoren Li,Yuying Meng,Shengfu Tong,Liqiang Mai,Mingmei Wu, Ultrathin nanobelts-assembled Chinese knot-like 3D TiO2 for fast and stable lithium storage. NanoRes.2018, 11(4): 2116–2128