Nano Lett.: Hydrogenation Driven Conductive Na2Ti3O7 Nanoarrays as Robust Binder-Free Anodes for Sodium-Ion Batteries

Title:

Hydrogenation Driven Conductive Na₂Ti₃O₇ Nanoarrays as Robust Binder-Free Anodes for Sodium-Ion Batteries

Authors:

Shidong Fu,^†Jiangfeng Ni,^†Yong Xu,^‡Qiao Zhang^*,‡and Liang Li^*,†

Institutions:

†College of Physics, Optoelectronics and Energy, Center for Energy Conversion Materials & Physics (CECMP), The Collaborative Innovation Center of Suzhou Nano Science and Technology, Soochow University, Suzhou 215006, P. R. China

‡Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices, Institute of Functional Nano and Soft Materials (FUNSOM), the Collaborative Innovation Center of Suzhou Nano Science and Technology, Soochow University, Suzhou 215123, P. R. China

Abstract:

We present a general and rational approach to fabricate highly accessible and affordable sodium-ion battery anodes by engineering three-dimensional hydrogenated Na₂Ti₃O₇ nanoarrays supported onflexible Ti substrates. The hydrogenated Na₂Ti₃O₇ nanoarrays exhibit desirable properties for sodium storage, such as high surface area, high electrical conductivity, and Na+ diffusivity. The as-obtained nanoarrays demonstrate remarkably stable and robust Na-storage performance when tested as binder-free anodes for sodium-ion battery. They can afford a high reversible (desodiation) capacity of 227 mA h g⁻¹ and retain a capacity of 65 mA h g⁻¹ over 10,000 continuous cycles at a high rate of 35 C. Therefore, through this synergy of array architecture and hydrogenation, it is possible to engineer numerous anodes that can reversibly store Na+ ions in a fast and stable manner.

IF:

13.592

Link:

http://pubs.acs.org/doi/pdf/10.1021/acs.nanolett.6b01805