Superior electrochemical performance of amorphous titanium niobium oxide thin films for Li-ion thin film batteries

Daramalla, V and Venkatesh, G and Kishore, B and Munichandraiah, N and Krupanidhi, SB (2018) Superior electrochemical performance of amorphous titanium niobium oxide thin films for Li-ion thin film batteries. In: Journal of the Electrochemical Society, 165 (5). A764-A772.

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Abstract

Titanium niobium oxide (TiNb2O7, TNO) has emerged as a competitor for Li4Ti5O12 (LTO) anode material for the next-generation high energy solid-state batteries. However, the usage of TNO is mainly limited by its low electronic conductivity and low lithium-ion diffusivity, which need to be improved for efficient electrochemical kinetics. Amorphous energy storage materials have been widely considered as alternatives. Here, we report the fabrication of amorphous TNO thin films and their electrochemical performance in half-cell rechargeable Li-ion thin film batteries. The amorphous TNO thin films exhibit: a high discharging capacity of 226 μAh/μm cm2 (∼460 mAh/g) at 17 μA/cm2 current density, the high coulombic efficiency of ∼99%, fast kinetics and stable structure. The amorphous TNO thin films further show a high discharge capacity than amorphous LTO thin films, which is twice greater than crystalline TNO thin films. They offer Li-ion diffusion coefficient of ≈10−13 cm2/s, better electron-transfer reaction and high electronic conductivity (≈1 × 10−9 S/cm) during electrochemical cycling process. The superior electrochemical performance of amorphous TNO thin films are attributed due to their unique disordered structure and morphology features.

Item Type:	Journal Article
Publication:	Journal of the Electrochemical Society
Publisher:	Electrochemical Society Inc.
Additional Information:	The copyright for this article belongs to the Electrochemical Society.
Keywords:	Amorphous films; Amorphous materials; Anodes; Electric conductivity; Electric discharges; Ions; Lithium compounds; Niobium oxide; Oxide films; Solid state devices; Thin film lithium ion batteries; Titanium oxides, Disordered structures; Electrochemical cycling; Electrochemical kinetics; Electrochemical performance; Electron-transfer reactions; Electronic conductivity; Ion diffusion coefficient; Solid state batteries, Thin films
Department/Centre:	Division of Chemical Sciences > Inorganic & Physical Chemistry Division of Chemical Sciences > Materials Research Centre
Date Deposited:	24 Aug 2022 04:55
Last Modified:	24 Aug 2022 04:55
URI:	https://eprints.iisc.ac.in/id/eprint/76073

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