Additive-free sodium titanate nanotube array as advanced electrode for sodium ion batteries

Low cycling stability and poor rate performance are two of the distinctive drawbacks of most electrode materials for sodium (Na) ion batteries due to the large size of the Na ions. The TiO6 octahedrons interconnect with each other by edges or corners to form both layer- and tunnel-structured sodium...

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Bibliographic Details
Published in:	Nano energy 2015-04, Vol.13, p.687-692
Main Authors:	Wang, Xuefeng, Li, Yejing, Gao, Yurui, Wang, Zhaoxiang, Chen, Liquan
Format:	Article
Language:	eng
Subjects:	Additive-free Nano-architecture Nanotube array Sodium ion batteries Sodium titanate
Online Access:	Get full text
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Summary:	Low cycling stability and poor rate performance are two of the distinctive drawbacks of most electrode materials for sodium (Na) ion batteries due to the large size of the Na ions. The TiO6 octahedrons interconnect with each other by edges or corners to form both layer- and tunnel-structured sodium titanates (NTO). Such open structures make NTO promising anode materials for sodium (Na) ion batteries. Herein, (conduction and binder) additive-free NTO nanotube array chemically engraved on a Ti foil is used as an electrode and exhibits outstanding rate performance and long-term cycling stability. When a current density of 3200mAg−1 (i.e., one complete cycle in one minute) is applied, the array delivers a reversible capacity of 42mAhg−1. Even after 5000 galvanostatic (400mAg−1) cycles, the electrode retains a capacity of 55mAhg−1. These excellent performances are attributed to the open structure and the nano-architecture of the NTO nanotube arrays. The (conductive and binding) additive-free NTO nanotube array chemically engraved on a Ti foil is used as an electrode and exhibits outstanding rate performance and long-term cycling stability. [Display omitted] •Sodium titanates (NTO) nanotube array was chemically engraved on metallic Ti foil.•Its open structure combines the layered Na2Ti3O7 and tunnel-type Na2Ti6O13.•Sucharchitecture enhances the contact between electrode and current collector.•NTO exhibits prominent cycling stability and rate performance.•The excellent performances are due to the nano-architectural designs of NTO.
ISSN:	2211-2855