Efficient surface modulation of single-crystalline Na₂Ti₃O₇ nanotube arrays with Ti³⁺ self-doping toward superior sodium storage

Date

2019

Authors

Liu, J.
Wang, Z.
Lu, Z.
Zhang, L.
Xie, F.
Vasileff, A.
Qiao, S.-Z.

Editors

Advisors

Journal Title

Journal ISSN

Volume Title

Type:

Journal article

Citation

ACS Materials Letters, 2019; 1(4):389-398

Statement of Responsibility

Jinlong Liu, Zhenyu Wang, Zhouguang Lu, Lei Zhang, Fangxi Xie, Anthony Vasileff and Shi-Zhang Qiao

Conference Name

DOI

10.1021/acsmaterialslett.9b00213

Abstract

Although Na2Ti3O7-based anodes have been widely investigated in sodium-ion batteries (SIBs), their Na+ storage properties especially high-rate capability and long-term cycling durability are far from practical application, because of their intrinsic low conductivity and unsatisfied Na+ diffusion resistance. Here, we report the surface engineering of Na2Ti3O7 nanotube arrays grown in situ on Ti foil through a hydrothermal method and subsequent NH3-assisted calcination. Benefiting from the effective surface modification, the as-derived free-standing electrode possesses highly crystalline surface with favorable Na+ diffusion kinetics and self-incorporation of abundant Ti3+ for improved electronic conductivity. These features enable the electrode to achieve remarkable reversible capacity (237.9 mAh g–1), ultra-high rate capability (88.5 mAh g–1 at 100 C = 17.7 A g–1), and excellent cycling stability (92.32% capacity retention at 50 C after 5000 cycles), which are superior to the counterpart without surface modification, as well as almost all Na2Ti3O7-based anode materials reported so far for SIBs. The outstanding electrochemical performance demonstrates the feasibility of proposed surface modulation in designing more efficient electrode materials for energy storage.

School/Discipline

Dissertation Note

Provenance

Description

Access Status

Rights

© 2019 American Chemical Society

License

Grant ID

http://purl.org/au-research/grants/arc/LP160100927
 http://purl.org/au-research/grants/arc/DE150101234
 http://purl.org/au-research/grants/arc/DP170104464,
 http://purl.org/au-research/grants/arc/DP160104866,
 http://purl.org/au-research/grants/arc/DP140104062
 http://purl.org/au-research/grants/arc/FL170100154

Published Version

https://doi.org/10.1021/acsmaterialslett.9b00213

Call number

Persistent link to this record

https://hdl.handle.net/2440/132238