Volume 61, Issue 44 e202212151
Research Article

Synergistic Interfacial Bonding in Reduced Graphene Oxide Fiber Cathodes Containing Polypyrrole@sulfur Nanospheres for Flexible Energy Storage

Lei Huang

Lei Huang

State Key Laboratory of Silicon Materials, Key Laboratory of Advanced Materials and Applications for Batteries of Zhejiang Province, School of Materials Science & Engineering, Zhejiang University, Hangzhou, 310027 China

These authors contributed equally to this work.

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Tuxiang Guan

Tuxiang Guan

State Key Laboratory of Materials-Oriented Chemical Engineering, College of Chemical Engineering, Nanjing Tech University, Nanjing, Jiangsu, 210009 P. R. China

These authors contributed equally to this work.

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Han Su

Han Su

State Key Laboratory of Silicon Materials, Key Laboratory of Advanced Materials and Applications for Batteries of Zhejiang Province, School of Materials Science & Engineering, Zhejiang University, Hangzhou, 310027 China

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Yu Zhong

Yu Zhong

State Key Laboratory of Silicon Materials, Key Laboratory of Advanced Materials and Applications for Batteries of Zhejiang Province, School of Materials Science & Engineering, Zhejiang University, Hangzhou, 310027 China

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Prof. Feng Cao

Prof. Feng Cao

Department of Engineering Technology, Huzhou College, Huzhou, 313000 P. R. China

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Prof. Yongqi Zhang

Corresponding Author

Prof. Yongqi Zhang

Institute of Fundamental and Frontier Science, University of Electronic Science and Technology of China, Chengdu, 611371 China

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Prof. Xinhui Xia

Corresponding Author

Prof. Xinhui Xia

State Key Laboratory of Silicon Materials, Key Laboratory of Advanced Materials and Applications for Batteries of Zhejiang Province, School of Materials Science & Engineering, Zhejiang University, Hangzhou, 310027 China

School of Materials Science & Engineering, Zhejiang University of Technology, Hangzhou, 310014 China

State Key Laboratory of Photocatalysis on Energy and Environment, Fuzhou University, Fuzhou, 350116 China

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Prof. Xiuli Wang

Prof. Xiuli Wang

State Key Laboratory of Silicon Materials, Key Laboratory of Advanced Materials and Applications for Batteries of Zhejiang Province, School of Materials Science & Engineering, Zhejiang University, Hangzhou, 310027 China

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Prof. Ningzhong Bao

Corresponding Author

Prof. Ningzhong Bao

State Key Laboratory of Materials-Oriented Chemical Engineering, College of Chemical Engineering, Nanjing Tech University, Nanjing, Jiangsu, 210009 P. R. China

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Prof. Jiangping Tu

Prof. Jiangping Tu

State Key Laboratory of Silicon Materials, Key Laboratory of Advanced Materials and Applications for Batteries of Zhejiang Province, School of Materials Science & Engineering, Zhejiang University, Hangzhou, 310027 China

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First published: 08 September 2022
Citations: 68

Graphical Abstract

We report a synergistic interface bonding strategy to construct novel flexible fiber-shaped composite cathodes, in which polypyrrole@sulfur (PPy@S) nanospheres (≈500 nm) are homogeneously implanted into the built-in cavity of self-assembled reduced graphene oxide fibers (rGOFs) by a facile microfluidic assembly method. The PPy@S/rGOFs cathode exhibits good mechanical property, excellent electronic conductivity and enhanced cycling performance and outstanding high-rate capacity.

Abstract

Flexible lithium sulfur batteries with high energy density and good mechanical flexibility are highly desirable. Here, we report a synergistic interface bonding enhancement strategy to construct flexible fiber-shaped composite cathodes, in which polypyrrole@sulfur (PPy@S) nanospheres are homogeneously implanted into the built-in cavity of self-assembled reduced graphene oxide fibers (rGOFs) by a facile microfluidic assembly method. In this architecture, sulfur nanospheres and lithium polysulfides are synergistically hosted by carbon and polymer interface, which work together to provide enhanced interface chemical bonding to endow the cathode with good adsorption ability, fast reaction kinetics, and excellent mechanical flexibility. Consequently, the PPy@S/rGOFs cathode shows enhanced electrochemical performance and high-rate capability. COMSOL Multiphysics simulations and density functional theory (DFT) calculations are conducted to elucidate the enhanced electrochemical performance. In addition, a flexible Li−S pouch cell is assembled and delivers a high areal capacity of 5.8 mAh cm−2 at 0.2 A g−1. Our work offers a new strategy for preparation of advanced cathodes for flexible batteries.

Conflict of interest

The authors declare no conflict of interest.

Data Availability Statement

Research data are not shared.

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