Volume 18, Issue 20 2201045
Research Article

Mechanistic Study of Interfacial Modification for Stable Zn Anode Based on a Thin Separator

Qing Li

Qing Li

Department of Materials Science and Engineering, City University of Hong Kong, 83 Tat Chee Avenue, Kowloon, Hong Kong, 999077 P. R. China

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Boxun Yan

Boxun Yan

Department of Materials Science and Engineering, City University of Hong Kong, 83 Tat Chee Avenue, Kowloon, Hong Kong, 999077 P. R. China

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Donghong Wang

Donghong Wang

Department of Materials Science and Engineering, City University of Hong Kong, 83 Tat Chee Avenue, Kowloon, Hong Kong, 999077 P. R. China

School of Materials Science and Engineering, Anhui University of Technology, Ma'anshan, 243032 China

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Qi Yang

Qi Yang

Department of Materials Science and Engineering, City University of Hong Kong, 83 Tat Chee Avenue, Kowloon, Hong Kong, 999077 P. R. China

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Zhaodong Huang

Zhaodong Huang

Department of Materials Science and Engineering, City University of Hong Kong, 83 Tat Chee Avenue, Kowloon, Hong Kong, 999077 P. R. China

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Jun Fan

Jun Fan

Department of Materials Science and Engineering, City University of Hong Kong, 83 Tat Chee Avenue, Kowloon, Hong Kong, 999077 P. R. China

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Ming Dai

Ming Dai

Key Laboratory of Bio-Based Material Science and Technology, Ministry of Education, Northeast Forestry University, Harbin, 150040 P. R. China

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Wenshuai Chen

Corresponding Author

Wenshuai Chen

Key Laboratory of Bio-Based Material Science and Technology, Ministry of Education, Northeast Forestry University, Harbin, 150040 P. R. China

E-mail: [email protected], [email protected]

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Chunyi Zhi

Corresponding Author

Chunyi Zhi

Department of Materials Science and Engineering, City University of Hong Kong, 83 Tat Chee Avenue, Kowloon, Hong Kong, 999077 P. R. China

Centre for Functional Photonics, City University of Hong Kong, Kowloon, Hong Kong, 999077 P. R. China

E-mail: [email protected], [email protected]

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First published: 15 April 2022
Citations: 22

Abstract

The interface plays a pivotal role in stabilizing metal anode. Extensive studies have been made but systematic research is lacking. In this study, preliminary studies are conducted to explore the prime conditions of interfacial modification to approach the practical requirements. Critical factors including reaction kinetics, transport rate, and modulus are identified to affect the Zn anode morphology significantly. The fundamental principle to enhance the Zn anode stability is systematically studied using the TEMPO-oxidized cellulose nanofiber (TOCNF) coating layer with thin a separator. Its advantageous mechanical properties buffer the huge volume variation. The existence of hydrophilic TOCNF in the Zn anode interface enhances the mass transfer process and alters the Zn2+ distribution with a record high double-layer capacitance (390 uF cm−2). With the synergetic effect, the modified Zn anode works stably under 5 mA cm−2 with a thin nonwoven paper as the separator (thickness 113 µm). At an ultra-high current density of 10 mA cm−2, this coated anode cycles for more than 300 h. This strategy shows an immense potential to drive the Zn anode forward toward practical applications.

Conflict of Interest

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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