Volume 20, Issue 26 2311343
Research Article

Cobalt Nitride Nanoparticles Encapsulated in N-Doped Carbon Nanotubes Modified Separator of Li–S Battery Achieving the Synergistic Effect of Restriction-Adsorption-Catalysis of Polysulfides

Henan Jia

Corresponding Author

Henan Jia

School of Materials Science and Engineering, Lanzhou University of Technology, Lanzhou, 730050 P. R. China

State Key Laboratory of Advanced Processing and Recycling of Non-ferrous Metals, Lanzhou University of Technology, Lanzhou, 730050 P. R. China

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

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Jiahang Fan

Jiahang Fan

School of Materials Science and Engineering, Lanzhou University of Technology, Lanzhou, 730050 P. R. China

State Key Laboratory of Advanced Processing and Recycling of Non-ferrous Metals, Lanzhou University of Technology, Lanzhou, 730050 P. R. China

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Pei Su

Pei Su

School of Materials Science and Engineering, Lanzhou University of Technology, Lanzhou, 730050 P. R. China

State Key Laboratory of Advanced Processing and Recycling of Non-ferrous Metals, Lanzhou University of Technology, Lanzhou, 730050 P. R. China

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Taotao Guo

Taotao Guo

School of Materials Science and Engineering, Lanzhou University of Technology, Lanzhou, 730050 P. R. China

State Key Laboratory of Advanced Processing and Recycling of Non-ferrous Metals, Lanzhou University of Technology, Lanzhou, 730050 P. R. China

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Mao-Cheng Liu

Corresponding Author

Mao-Cheng Liu

School of Materials Science and Engineering, Lanzhou University of Technology, Lanzhou, 730050 P. R. China

State Key Laboratory of Advanced Processing and Recycling of Non-ferrous Metals, Lanzhou University of Technology, Lanzhou, 730050 P. R. China

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

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First published: 18 January 2024
Citations: 34

Abstract

Although lithium–sulfur (Li–S) batteries have broad market prospects due to their high theoretical energy density and potential cost-effectiveness, the practical applications still face serious shuttle effects of polysulfides (LiPSs) and slow redox reactions. Therefore, in this paper, cobalt nitride nanoparticles encapsulated in nitrogen-doped carbon nanotube (CoN@NCNT) are prepared as a functional layer for the separator of high-performance Li–S batteries. Carbon nanotubes with large specific surface areas not only promote the transport of ions and electrons but also weaken the migration of LiPSs and confine the dissolution of LiPSs in electrolytes. The lithiophilic heteroatom N adsorbs LiPSs by strong chemical adsorption, and the CoN particles with high catalytic activity greatly improve the kinetics of the conversion between LiPSs and Li2S2/Li2S during the charge–discharge process. Due to these advantages, the battery with CoN@NCNT modified separator has superior rate performance (initial discharge capacity of 834.7 mAh g−1 after activation at 1 C) and excellent cycle performance (capacity remains 729.7 mAh g−1 after 200 cycles at 0.2 C). This work proposes a strategy that can give the separator a strong ability to confinement-adsorption-catalysis of LiPSs in order to provide more possibilities for the development of Li–S batteries.

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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