Volume 58, Issue 49 pp. 17782-17787
Research Article

Li-N2 Batteries: A Reversible Energy Storage System?

Dr. Zhang Zhang

Corresponding Author

Dr. Zhang Zhang

College of Chemistry and Chemical Engineering and Henan Key Laboratory of Utilization of Non-Metallic Mineral in the South of Henan, Xinyang Normal University, Xinyang, 464000 China

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Shuangshuang Wu

Shuangshuang Wu

College of Chemistry and Chemical Engineering and Henan Key Laboratory of Utilization of Non-Metallic Mineral in the South of Henan, Xinyang Normal University, Xinyang, 464000 China

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Chao Yang

Chao Yang

College of Chemistry and Chemical Engineering and Henan Key Laboratory of Utilization of Non-Metallic Mineral in the South of Henan, Xinyang Normal University, Xinyang, 464000 China

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Lingyun Zheng

Lingyun Zheng

College of Chemistry and Chemical Engineering and Henan Key Laboratory of Utilization of Non-Metallic Mineral in the South of Henan, Xinyang Normal University, Xinyang, 464000 China

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Dongli Xu

Dongli Xu

College of Chemistry and Chemical Engineering and Henan Key Laboratory of Utilization of Non-Metallic Mineral in the South of Henan, Xinyang Normal University, Xinyang, 464000 China

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Ruhua Zha

Ruhua Zha

College of Chemistry and Chemical Engineering and Henan Key Laboratory of Utilization of Non-Metallic Mineral in the South of Henan, Xinyang Normal University, Xinyang, 464000 China

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Lin Tang

Lin Tang

College of Chemistry and Chemical Engineering and Henan Key Laboratory of Utilization of Non-Metallic Mineral in the South of Henan, Xinyang Normal University, Xinyang, 464000 China

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Kangzhe Cao

Kangzhe Cao

College of Chemistry and Chemical Engineering and Henan Key Laboratory of Utilization of Non-Metallic Mineral in the South of Henan, Xinyang Normal University, Xinyang, 464000 China

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Xin-gai Wang

Xin-gai Wang

School of Materials Science and Engineering, Institute of New Energy Material Chemistry, Key Laboratory of Advanced Energy Materials Chemistry (Ministry of Education), Renewable Energy Conversion and Storage Center (ReCast), Nankai University, Tianjin, 300350 China

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Prof. Zhen Zhou

Corresponding Author

Prof. Zhen Zhou

School of Materials Science and Engineering, Institute of New Energy Material Chemistry, Key Laboratory of Advanced Energy Materials Chemistry (Ministry of Education), Renewable Energy Conversion and Storage Center (ReCast), Nankai University, Tianjin, 300350 China

School of Chemical Engineering and Energy, Zhengzhou University, Zhengzhou, 450001 China

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First published: 08 October 2019
Citations: 52

Graphical Abstract

In a fix: Graphene was introduced into Li-N2 batteries to investigate the stability of the reaction cycle. The instability and hygroscopicity of the discharge product Li3N leads to the low efficiency and irreversibility of Li-N2 batteries. Moreover, modification by in situ generated Li3N and LiOH reduces the loss and volume change of Li anodes during stripping and plating, thereby promoting the rechargeability of Li-N2 batteries.

Abstract

Tremendous energy consumption is required for traditional artificial N2 fixation, leading to additional environmental pollution. Recently, new Li-N2 batteries have inextricably integrated energy storage with N2 fixation. In this work, graphene is introduced into Li-N2 batteries and enhances the cycling stability. However, the instability and hygroscopicity of the discharge product Li3N lead to a rechargeable but irreversible system. Moreover, strong nonpolar N≡N covalent triple bonds with high ionization energies also cause low efficiency and irreversibility of Li-N2 batteries. In contrast, the modification with in situ generated Li3N and LiOH restrained the loss and volume change of Li metal anodes during stripping and plating, thereby promoting the rechargeability of the Li-N2 batteries. The mechanistic study here will assist in the design of more stable Li-N2 batteries and create more versatile methods for N2 fixation.

Conflict of interest

The authors declare no conflict of interest.

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