title: Unravelling the correlation between the aspect ratio of nanotubular structures and their electrochemical performance to achieve high-rate and long-life lithium-ion batteries.
abstract: The fundamental understanding of the relationship between the nanostructure of an electrode and its electrochemical performance is crucial for achieving high-performance lithium-ion batteries (LIBs). In this work, the relationship between the nanotubular aspect ratio and electrochemical performance of LIBs is elucidated for the first time. The stirring hydrothermal method was used to control the aspect ratio of viscous titanate nanotubes, which were used to fabricate additive-free TiO2 -based electrode materials. We found that the battery performance at high charging/discharging rates is dramatically boosted when the aspect ratio is increased, due to the optimization of electronic/ionic transport properties within the electrode materials. The proof-of-concept LIBs comprising nanotubes with an aspect ratio of 265 can retain more than 86 % of their initial capacity over 6000 cycles at a high rate of 30 C. Such devices with supercapacitor-like rate performance and battery-like capacity herald a new paradigm for energy storage systems.
authors.affiliation: School of Materials Science and Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798 (Singapore) http://www.ntu.edu.sg/home/chenxd/
authors.forename: Yuxin
authors.initials: Y
authors.lastname: Tang
authors.forename: Yanyan
authors.initials: Y
authors.lastname: Zhang
authors.forename: Jiyang
authors.initials: J
authors.lastname: Deng
authors.forename: Dianpeng
authors.initials: D
authors.lastname: Qi
authors.forename: Wan Ru
authors.initials: WR
authors.lastname: Leow
authors.forename: Jiaqi
authors.initials: J
authors.lastname: Wei
authors.forename: Shengyan
authors.initials: S
authors.lastname: Yin
authors.forename: Zhili
authors.initials: Z
authors.lastname: Dong
authors.forename: Rachid
authors.initials: R
authors.lastname: Yazami
authors.forename: Zhong
authors.initials: Z
authors.lastname: Chen
authors.forename: Xiaodong
authors.initials: X
authors.lastname: Chen
mesh_terms: D011211:Electric Power Supplies; D004566:Electrodes; D008094:Lithium / Q000737:chemistry*; D043942:Nanotubes / Q000737:chemistry* / Q000648:ultrastructure; D014025:Titanium / Q000737:chemistry*
chemical_list: C009495:titanium dioxide; D008094:Lithium; D014025:Titanium
keywords: TiO2; aspect ratio; lithium-ion batteries; nanotubes