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Nano Research 2023, 16(7): 9453-9460 https://doi.org/10.1007/s12274-023-5663-5
Research Article | Issue | Published: 11 April 2023

A molecular sieve-containing protective separator to suppress the shuttle effect of redox mediators in lithium-oxygen batteries

Show Author's Information Xinbin Wu1,2,§,  Huiping Wu1,§,  Shundong Guan1,  Ying Liang1,  Kaihua Wen1,  Huanchun Wang2,  Xuanjun Wang2( ),  Ce-Wen Nan1,  Liangliang Li1( )
State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University, Beijing 100084, China
High-Tech Institute of Xi’an, Xi’an 710025, China

§ Xinbin Wu and Huiping Wu contributed equally to this work.

Keywords:
lithium-oxygen batteries, zeolite, shuttle effects, protective separators, molecular sieves, redox mediators
Topics:
Air batteries
Cite this article:
Wu X, Wu H, Guan S, et al. A molecular sieve-containing protective separator to suppress the shuttle effect of redox mediators in lithium-oxygen batteries. Nano Research, 2023, 16(7): 9453-9460. https://doi.org/10.1007/s12274-023-5663-5
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Abstract Full text Electronic supplementary material About this article

Lithium-oxygen (Li-O2) batteries have a great potential in energy storage and conversion due to their ultra-high theoretical specific energy, but their applications are hindered by sluggish redox reaction kinetics in the charge/discharge processes. Redox mediators (RMs), as soluble catalysts, are widely used to facilitate the electrochemical processes in the Li-O2 batteries. A drawback of RMs is the shuttle effect due to their solubility and mobility, which leads to the corrosion of a Li metal anode and the degradation of the electrochemical performance of the batteries. Herein, we synthesize a polymer-based composite protective separator containing molecular sieves. The nanopores with a diameter of 4 Å in the zeolite powder (4A zeolite) are able to physically block the migration of 2,2,6,6-tetramethylpiperidinyloxy (TEMPO) molecules with a larger size; therefore, the shuttle effect of TEMPO is restrained. With the assistance of the zeolite molecular sieves, the cycle life of the Li-O2 batteries is significantly extended from ~ 20 to 170 cycles at a current density of 250 mA·g−1 and a limited capacity of 500 mAh·g−1. Our work provides a highly effective approach to suppress the shuttle effects of RMs and boost the electrochemical performance of Li-O2 batteries.


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About this article

A molecular sieve-containing protective separator to suppress the shuttle effect of redox mediators in lithium-oxygen batteries

Show Author's information Xinbin Wu1,2,§, Huiping Wu1,§, Shundong Guan1, Ying Liang1, Kaihua Wen1, Huanchun Wang2, Xuanjun Wang2( ), Ce-Wen Nan1, Liangliang Li1( )
State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University, Beijing 100084, China
High-Tech Institute of Xi’an, Xi’an 710025, China

§ Xinbin Wu and Huiping Wu contributed equally to this work.

Abstract

Lithium-oxygen (Li-O2) batteries have a great potential in energy storage and conversion due to their ultra-high theoretical specific energy, but their applications are hindered by sluggish redox reaction kinetics in the charge/discharge processes. Redox mediators (RMs), as soluble catalysts, are widely used to facilitate the electrochemical processes in the Li-O2 batteries. A drawback of RMs is the shuttle effect due to their solubility and mobility, which leads to the corrosion of a Li metal anode and the degradation of the electrochemical performance of the batteries. Herein, we synthesize a polymer-based composite protective separator containing molecular sieves. The nanopores with a diameter of 4 Å in the zeolite powder (4A zeolite) are able to physically block the migration of 2,2,6,6-tetramethylpiperidinyloxy (TEMPO) molecules with a larger size; therefore, the shuttle effect of TEMPO is restrained. With the assistance of the zeolite molecular sieves, the cycle life of the Li-O2 batteries is significantly extended from ~ 20 to 170 cycles at a current density of 250 mA·g−1 and a limited capacity of 500 mAh·g−1. Our work provides a highly effective approach to suppress the shuttle effects of RMs and boost the electrochemical performance of Li-O2 batteries.

Keywords: lithium-oxygen batteries, zeolite, shuttle effects, protective separators, molecular sieves, redox mediators

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Acknowledgements

Publication history

Received: 20 December 2022
Revised: 20 February 2023
Accepted: 12 March 2023
Published: 11 April 2023
Issue date: July 2023

Copyright

© Tsinghua University Press 2023

Acknowledgements

Acknowledgements

This work was financially supported by the National Natural Science Foundation of China (Nos. U21A2080 and 51788104), Beijing Natural Science Foundation (No. L223008), and National Key Research and Development Program of China (No. 2022YFB2404403).

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