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K2Ti4O9: A Promising Anode Material for Potassium Ion Batteries

Kishore, Brij and Venkatesh, G and Munichandraiah, N (2016) K2Ti4O9: A Promising Anode Material for Potassium Ion Batteries. In: JOURNAL OF THE ELECTROCHEMICAL SOCIETY, 163 (13). A2551-A2554.

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Official URL: http://dx.doi.org/10.1149/2.0421613jes

Abstract

Potassium tetratitanate (K2Ti4O9) has been synthesized by solid state method using K2CO3 and TiO2, and studied as an anode material for potassium ion batteries for the first time. A discharge capacity of 80 mAh g(-1) has been obtained at a current density of 100 mA g(-1) (0.8 C rate) and 97 mAh g(-1) at 30 mA g(-1) (0.2 C rate), initially. The discharge capacity is stable at low rates of cycling. The uptake of K+ on charging K2Ti4O9 electrodes is quantitatively studied. The proposed mechanism of charging involves reduction of two Ti ions from 4+ oxidation state to 3+ oxidation state, which facilitates insertion of two K+ ions per formula unit. The rate capability experiments suggest that K2Ti4O9 is capable of undergoing charge-discharge cycling at high rates (up to 15 C rate), but with a low discharge capacity. Thus K2Ti4O9 is a promising anode material for future K-ion batteries. (C) 2016 The Electrochemical Society. All rights reserved.

Item Type: Journal Article
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 > Inorganic & Physical Chemistry
Division of Physical & Mathematical Sciences > Instrumentation Appiled Physics
Depositing User: Id for Latest eprints
Date Deposited: 07 Jan 2017 10:05
Last Modified: 07 Jan 2017 10:05
URI: http://eprints.iisc.ac.in/id/eprint/55895

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