Volume 63, Issue 51 e202412173
Research Article

Constructing Quasi-Single Ion Conductors by a β-Cyclodextrin Polymer to Stabilize Zn Anode

Guoqun Zhang

Guoqun Zhang

School of Integrated Circuits Wuhan National Laboratory for Optoelectronics (WNLO) Key Laboratory of Material Chemistry for Energy Conversion and Storage, Huazhong University of Science and Technology, Wuhan, 430074 P.R. China

These authors contributed equally to this work.

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Dr. Lulu Fu

Dr. Lulu Fu

Department of Chemistry School of Science, Tianjin University of Science & Technology, Tianjin, 300457 P.R. China

These authors contributed equally to this work.

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Dr. Yuan Chen

Dr. Yuan Chen

School of Integrated Circuits Wuhan National Laboratory for Optoelectronics (WNLO) Key Laboratory of Material Chemistry for Energy Conversion and Storage, Huazhong University of Science and Technology, Wuhan, 430074 P.R. China

Wenzhou Advanced Manufacturing Institute, Huazhong University of Science and Technology, Wenzhou, 325035 P.R. China

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Dr. Kun Fan

Dr. Kun Fan

School of Integrated Circuits Wuhan National Laboratory for Optoelectronics (WNLO) Key Laboratory of Material Chemistry for Energy Conversion and Storage, Huazhong University of Science and Technology, Wuhan, 430074 P.R. China

Wenzhou Advanced Manufacturing Institute, Huazhong University of Science and Technology, Wenzhou, 325035 P.R. China

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Dr. Chenyang Zhang

Dr. Chenyang Zhang

School of Integrated Circuits Wuhan National Laboratory for Optoelectronics (WNLO) Key Laboratory of Material Chemistry for Energy Conversion and Storage, Huazhong University of Science and Technology, Wuhan, 430074 P.R. China

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Huichao Dai

Huichao Dai

School of Integrated Circuits Wuhan National Laboratory for Optoelectronics (WNLO) Key Laboratory of Material Chemistry for Energy Conversion and Storage, Huazhong University of Science and Technology, Wuhan, 430074 P.R. China

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Linnan Guan

Linnan Guan

School of Integrated Circuits Wuhan National Laboratory for Optoelectronics (WNLO) Key Laboratory of Material Chemistry for Energy Conversion and Storage, Huazhong University of Science and Technology, Wuhan, 430074 P.R. China

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Haoyu Guo

Haoyu Guo

School of Integrated Circuits Wuhan National Laboratory for Optoelectronics (WNLO) Key Laboratory of Material Chemistry for Energy Conversion and Storage, Huazhong University of Science and Technology, Wuhan, 430074 P.R. China

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Dr. Minglei Mao

Dr. Minglei Mao

School of Integrated Circuits Wuhan National Laboratory for Optoelectronics (WNLO) Key Laboratory of Material Chemistry for Energy Conversion and Storage, Huazhong University of Science and Technology, Wuhan, 430074 P.R. China

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Prof. Dr. Chengliang Wang

Corresponding Author

Prof. Dr. Chengliang Wang

School of Integrated Circuits Wuhan National Laboratory for Optoelectronics (WNLO) Key Laboratory of Material Chemistry for Energy Conversion and Storage, Huazhong University of Science and Technology, Wuhan, 430074 P.R. China

Wenzhou Advanced Manufacturing Institute, Huazhong University of Science and Technology, Wenzhou, 325035 P.R. China

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First published: 28 August 2024
Citations: 15

Graphical Abstract

A β-cyclodextrin polymer is used to construct a quasi-single ion conductor for coating the Zn anodes, and thereby inhibited the corrosion of Zn anode, prevented the side reaction, elevated the Zn ion transference number, suppressed the formation of space charge regions and stabilized the plating/striping of Zn ions.

Abstract

Aqueous Zn-ion batteries (AZIBs) are promising for the next-generation large-scale energy storage. However, the Zn anode remains facing challenges. Here, we report a cyclodextrin polymer (P-CD) to construct quasi-single ion conductor for coating and protecting Zn anodes. The P-CD coating layer inhibited the corrosion of Zn anode and prevented the side reaction of metal anodes. More important is that the cyclodextrin units enabled the trapping of anions through host–guest interactions and hydrogen bonds, forming a quasi-single ion conductor that elevated the Zn ion transference number (from 0.31 to 0.68), suppressed the formation of space charge regions and hence stabilized the plating/striping of Zn ions. As a result, the Zn//Zn symmetric cells coated with P-CD achieved a 70.6 times improvement in cycle life at high current densities of 10 mA cm−2 with 10 mAh cm−2. Importantly, the Zn//K1.1V3O8 (KVO) full-cells with high mass loading of cathode materials and low N/P ratio of 1.46 reached the capacity retention of 94.5 % after 1000 cycles at 10 A g−1; while the cell without coating failed only after 230 cycles. These results provide novel perspective into the control of solid-electrolyte interfaces for stabilizing Zn anode and offer a practical strategy to improve AZIBs.

Conflict of Interests

The authors declare no conflict of interest.

Data Availability Statement

The data that support the findings of this study are available from the corresponding author upon reasonable request.

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