Volume 61, Issue 2 e202111826
Research Article

Vacancy Modulating Co3Sn2S2 Topological Semimetal for Aqueous Zinc-Ion Batteries

Dr. Yuwei Zhao

Dr. Yuwei Zhao

Department of Materials Science and Engineering, City University of Hong Kong, Hong Kong, China

These authors contributed equally to this work.

Search for more papers by this author
Dr. Yongbin Zhu

Dr. Yongbin Zhu

Department of Materials Science and Engineering, Southern University of Science and Technology, Shenzhen, China

These authors contributed equally to this work.

Search for more papers by this author
Dr. Feng Jiang

Dr. Feng Jiang

Department of Materials Science and Engineering, Southern University of Science and Technology, Shenzhen, China

Search for more papers by this author
Dr. Yiyao Li

Dr. Yiyao Li

School of Materials Science and Engineering, Beihang University, Beijing, China

Search for more papers by this author
Dr. You Meng

Dr. You Meng

Department of Materials Science and Engineering, City University of Hong Kong, Hong Kong, China

Search for more papers by this author
Dr. Ying Guo

Dr. Ying Guo

Department of Materials Science and Engineering, City University of Hong Kong, Hong Kong, China

Search for more papers by this author
Dr. Qing Li

Dr. Qing Li

Department of Materials Science and Engineering, City University of Hong Kong, Hong Kong, China

Search for more papers by this author
Dr. Zhaodong Huang

Dr. Zhaodong Huang

Department of Materials Science and Engineering, City University of Hong Kong, Hong Kong, China

Search for more papers by this author
Dr. Shaoce Zhang

Dr. Shaoce Zhang

Department of Materials Science and Engineering, City University of Hong Kong, Hong Kong, China

Search for more papers by this author
Dr. Rong Zhang

Dr. Rong Zhang

Department of Materials Science and Engineering, City University of Hong Kong, Hong Kong, China

Search for more papers by this author
Prof. Johnny C. Ho

Prof. Johnny C. Ho

Department of Materials Science and Engineering, City University of Hong Kong, Hong Kong, China

Search for more papers by this author
Prof. Qianfan Zhang

Prof. Qianfan Zhang

School of Materials Science and Engineering, Beihang University, Beijing, China

Search for more papers by this author
Prof. Weishu Liu

Corresponding Author

Prof. Weishu Liu

Department of Materials Science and Engineering, Southern University of Science and Technology, Shenzhen, China

Search for more papers by this author
Prof. Chunyi Zhi

Corresponding Author

Prof. Chunyi Zhi

Department of Materials Science and Engineering, City University of Hong Kong, Hong Kong, China

Centre for Functional Photonics, City University of Hong Kong, Kowloon, Hong Kong, China

Search for more papers by this author
First published: 15 October 2021
Citations: 28

Graphical Abstract

A Weyl semimetal Co3Sn2S2 cathode was applied in aqueous Zn-ion batteries with a discharge plateau around 1.5 V. Co3Sn1.8S2 activates Sn2+ and provides active sites with impressive charge-storage capabilities and fast kinetic processes. The material has high structural stability and conductivity, and an ionic diffusion rate that achieves appreciable cycling stability and capacity retention.

Abstract

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.

Conflict of interest

The authors declare no conflict of interest.

The full text of this article hosted at iucr.org is unavailable due to technical difficulties.