Hollow nanocubes constructed from <001> oriented anatase TiO2 nanoarrays: topotactic conversion and fast lithium-ion storage. Issue 18 (15th March 2017)

• Record Type: Journal Article
• Authors: You, Huali; Wu, Qili; Li, Jiade; He, Shiman; Li, Xiaohui; Yang, Xianfeng; Yang, Jingling; Meng, Yuying; Tong, Shengfu; Wu, Mingmei
• Is Part Of: CrystEngComm. Volume 19:Issue 18(2017)
• Page Start: 2456
• Page End: 2463
• Publication Date: 2017-03-15
• Subjects: Crystals -- Periodicals; Crystal growth -- Periodicals; Crystallography -- Periodicals; Cristaux -- Périodiques; Cristaux -- Croissance -- Périodiques; Cristallographie -- Périodiques; 548
• DOI: 10.1039/c7ce00193b
• Languages: English
• ISSNs: 1466-8033

Abstract

Abstract : Oriented anatase TiO2 nanoarrays are rationally synthesized by topotactic conversion and in situ epitaxial growth, and utilized for fast Li + storage. Abstract : Mechanically stable titanium dioxide (TiO2 ) with the abilities of rapidly storing and releasing Li + can be potentially applied in electric and hybrid electric vehicles, due to its ability to enhance the stability and safety, as well as the high current performance, of lithium ion batteries (LIBs). Herein, we rationally and facilely synthesized <001> oriented anatase TiO2 nanoarrays (OATNs) from the NH4 TiOF3 mesocrystal precursor through topotactic conversion and in situ epitaxial growth under moderate conditions. This study proves that the crystallization, porous structure, and orientation of OATNs are controllable, which affect the electronic and electrochemical properties and the Li + diffusion coefficient. The optimal OATNs formed by hydrothermally treating NH4 TiOF3 mesocrystals with an H3 BO3 aqueous solution for 10 h (OATNs-10) delivered a high capacity of ca. 115 mA h g −1 at a current density of 50 C (170 mA g −1 of 1 C) even after continuous 2000 cycles with a Coulombic efficiency of ca. 100%. This indicates a high current rate performance and excellent stability. The unique properties of OATNs-10 make them a promising candidate for practical applications in LIBs.