Vacancy Modulating Co3Sn2S2 Topological Semimetal for Aqueous Zinc-Ion Batteries

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Original languageEnglish
Article numbere202111826
Journal / PublicationAngewandte Chemie - International Edition
Issue number2
Online published15 Oct 2021
Publication statusPublished - 10 Jan 2022


Weyl semimetals (WSMs) with high electrical conductivity and suitable carrier density near the Fermi level are enticing candidates for aqueous Zn-ion batteries (AZIBs), meriting from topological surface states (TSSs). We propose a WSM Co3Sn2S2 cathode for AZIBs showing a discharge plateau around 1.5 V. By introducing Sn vacancies, extra redox peaks from the Sn4+/Sn2+ transition appear, which leads to more Zn2+ transfer channels and active sites promoting charge-storage kinetics and Zn2+ storage capability. Co3Sn1.8S2 achieves a specific energy of 305 Wh kg−1 (0.2 Ag−1) and a specific power of 4900 Wkg−1 (5 Ag−1). Co3Sn1.8S2 and ZnxCo3Sn1.8S2 benefit from better conductivity at lower temperatures; the quasi-solid Co3Sn1.8S2//Zn battery delivers 126 mAh g−1 (0.6 Ag−1) at −30°C and a cycling stability over 3000 cycles (2 Ag−1) with 85 % capacity retention at −10°C.

Research Area(s)

  • aqueous zinc-ion batteries, tin vacancies, topological semimetals, Weyl semimetals

Citation Format(s)