Autocombustion Synthesis of Nanostructured Na2Ti6O13 Negative Insertion Material for Na-Ion Batteries: Electrochemical and Diffusion Mechanism

Ghosh, Swatilekha and Mani, Allumolu Daya and Kishore, Brij and Munichandraiah, Nookala and Rao, Rayavarapu Prasada and Wong, Lee Loong and Adams, Stefan and Barpanda, Prabeer (2017) Autocombustion Synthesis of Nanostructured Na2Ti6O13 Negative Insertion Material for Na-Ion Batteries: Electrochemical and Diffusion Mechanism. In: JOURNAL OF THE ELECTROCHEMICAL SOCIETY, 164 (9). A1881-A1886.

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Abstract

In the pursuit to develop practical sodium-ion batteries, safe negative insertion (anode) materials are essential. Recently, Na2Ti6O13 has been unveiled by conventional solid-state synthesis as a 0.85 V anode with 1-dimensional Na+ diffusion pathways. Here, an energy-savvy autocombustion synthesis has been successfully implemented to produce the target compound Na2Ti6O13 by restricting the annealing duration within 2 h. This drastic reduction in heat-treatment time involves minimal grain-growth hence forming homogeneous nanostructured particles (similar to 100 nm). It benchmarks the shortest synthesis of Ti-based anodes for sodium-ion batteries. The current work describes various aspects of autocombustion route. The as-prepared compound delivers near theoretical capacity (ca. 40 mAh g(-1)) involving a Ti4+/Ti3+ redox potential centered at 0.83 V (vs. Na/Na+) with excellent reversibility. Using both experiment and bond valence site energy (BVSE) modeling, the electrochemical, Na+ diffusion pathways and corresponding energy barriers have been explained. (C) 2017 The Electrochemical Society. All rights reserved.

Item Type:	Journal Article
Publication:	JOURNAL OF THE ELECTROCHEMICAL SOCIETY
Additional Information:	Copy right for this article belongs to the ELECTROCHEMICAL SOC INC, 65 SOUTH MAIN STREET, PENNINGTON, NJ 08534 USA
Department/Centre:	Division of Chemical Sciences > Materials Research Centre
Date Deposited:	11 Nov 2017 06:50
Last Modified:	11 Nov 2017 06:50
URI:	http://eprints.iisc.ac.in/id/eprint/58222

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