Electrochemically Stable Sodium Metal-Tellurium/Carbon Nanorods Batteries

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journal

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Detail(s)

Original languageEnglish
Article number1903046
Journal / PublicationAdvanced Energy Materials
Volume9
Issue number48
Online published12 Nov 2019
Publication statusPublished - 27 Dec 2019

Abstract

Electrochemical metal cells utilizing tellurium and sodium chemistry are being extensively explored for developing advanced high-performance batteries. The daunting challenges, however, still remain with low rate capability/volumetric capacity, unclear redox reaction processes, and the notorious sodium dendrites. Here, a cell design that features a novel Te/carbon nanorods cathode and a tailored ether-based electrolyte is reported. It is the first report of Na metal-Te full batteries with performance comparable to those of reported Na-S and Na-Se batteries at low ratings. By using the semimetal Te instead of the insulating S or Se, the Na-Te batteries actually outperform reported Na-S and Na-Se batteries at high ratings. Ab initio molecular dynamics simulations, UV-vis spectrum, ex situ X-ray photoelectron spectroscopy, and scanning electron microscopy results clearly reveal a three-step redox process and stability of the Na metal-Te cells. These comprehensive results demonstrate the feasibility of practical Na metal-Te batteries with high volumetric energy density and a viable cell fabrication cost.

Research Area(s)

  • AIMD simulations, Na metal-Te cell, redox reaction kinetics, sodium dendrites, Te/carbon nanorods cathode, SELENIUM, LITHIUM, COMPOSITE, CATHODE, SULFUR, ANODES

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