Aqueous Zinc–Tellurium Batteries with Ultraflat Discharge Plateau and High Volumetric Capacity

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Original languageEnglish
Article number2001469
Journal / PublicationAdvanced Materials
Issue number42
Online published13 Sep 2020
Publication statusPublished - 22 Oct 2020


Traditional aqueous zinc-ion batteries (ZIBs) based on ion-intercalation or surface redox behaviors at the cathode side suffer severely from an unsatisfactory specific capacity and unstable output potential. Herein, these issues are applied to a conversion-type zinc–tellurium (Zn–Te) battery. Typically, this battery works based on a two-step solid-to-solid conversion with the successive formation of zinc ditelluride (ZnTe2) and zinc telluride (ZnTe). It delivers an ultrahigh volumetric capacity of 2619 mAh cm−3 (419 mAh g−1), 74.1% of which is from the first conversion (Te to ZnTe2) with an ultraflat discharge plateau. Though reported first in a challenging aqueous environment, this Zn–Te battery demonstrates an excellent capacity retention of >82.8% after 500 cycles, which results from the elimination of the notorious “shuttle effect” due to the solid-to-solid conversion behaviors. In addition, a quasi-solid-state Zn–Te battery is also fabricated, exhibiting superior flexibility, robustness, and good electrochemical performance. This work develops a novel cathode material based on conversion-type ion-storage mechanism. The system is attractive due to its ultrastable energy output, which is rarely reported for ZIBs.

Research Area(s)

  • conversion-type mechanisms, high volumetric capacities, tellurium, ultraflat discharge plateaus, zinc-ion batteries