Tellurium : A High-Performance Cathode for Magnesium Ion Batteries Based on a Conversion Mechanism

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

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Detail(s)

Original languageEnglish
Pages (from-to)5349–5357
Journal / PublicationACS Nano
Volume16
Issue number4
Online published31 Mar 2022
Publication statusPublished - 26 Apr 2022

Abstract

Magnesium ion batteries (MIBs), due to the low redox potential of Mg, high theoretical capacity, dendrite-free magnesiation, and safe nature, have been recognized as a post-lithium energy storage system. However, an ongoing challenge, sluggish Mg2+ kinetics in the small number of available cathode materials of MIBs, restricts its further development. The existing cathodes mostly deliver unsatisfactory capacity with poor cycling life based on the traditional ion-intercalation mechanism. Herein, we fabricated a conversion-type Mg||Te battery based on a reversible two-step conversion reaction (Te to MgTe2 to MgTe). High discharge capacities (387 mAh g-1) and rate capability (165 mAh g-1 at 5 A g-1) can be achieved. The diffusivity of Mg2+ can reach 3.54 × 10-8 cm2 s-1, enabled by the high electrical conductivity of Te and increased surface conversion sites. Subsequently, ab initio molecular dynamics simulation was also carried out to further confirm the conversion mechanism and fast Mg2+ transportation kinetics.

Research Area(s)

  • carbon host materials, conversion-type mechanism, magnesium ion batteries, shuttle effect, tellurium

Citation Format(s)