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Lithium-oxygen (Li-O2) batteries have been regarded as an expectant successor for next-generation energy storage systems owing to their ultra-high theoretical energy density. However, the comprehensive properties of the commonly utilized organic salt electrolyte are still unsatisfactory, not to mention their expensive prices, which seriously hinders the practical production and application of Li-O2 batteries. Herein, we have proposed a low-cost all-inorganic nitrate electrolyte (LiNO3−KNO3−DMSO) for Li-O2 batteries. The inorganic nitrate electrolyte exhibits higher ionic conductivity and a wider electrochemical stability window than the organic salt electrolyte. The existence of K+ can stabilize the O2 intermediate, promoting the discharge process through the solution pathway with an enlarged capacity. Even at an ultra-low concentration of 0.01 M, the K+ can still remain stable to promote the solution discharge process and also possess a new function of inhibiting the dendrite growth by electrostatic shielding, further enhancing the battery stability and contributing to the long cycle lifetime. As a result, in the 0.99 M LiNO3−0.01 M KNO3−DMSO electrolyte, the Li-O2 batteries exhibit prolonged cycling performance (108 cycles) and excellent rate performance (2 A·g−1), significantly superior to the organic salt one.


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All-inorganic nitrate electrolyte for high-performance lithium oxygen battery

Show Author's information Dongyue Yang1,2Jiayi Du1,2Kai Chen1Haoran Zhang1,2Gang Huang1,2Tong Liu1,2Xinbo Zhang1,2Hongjie Zhang1,2( )
State Key Laboratory of Rare Earth Resource Utilization, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, China
School of Applied Chemistry and Engineering, University of Science and Technology of China, Hefei 230026, China

Abstract

Lithium-oxygen (Li-O2) batteries have been regarded as an expectant successor for next-generation energy storage systems owing to their ultra-high theoretical energy density. However, the comprehensive properties of the commonly utilized organic salt electrolyte are still unsatisfactory, not to mention their expensive prices, which seriously hinders the practical production and application of Li-O2 batteries. Herein, we have proposed a low-cost all-inorganic nitrate electrolyte (LiNO3−KNO3−DMSO) for Li-O2 batteries. The inorganic nitrate electrolyte exhibits higher ionic conductivity and a wider electrochemical stability window than the organic salt electrolyte. The existence of K+ can stabilize the O2 intermediate, promoting the discharge process through the solution pathway with an enlarged capacity. Even at an ultra-low concentration of 0.01 M, the K+ can still remain stable to promote the solution discharge process and also possess a new function of inhibiting the dendrite growth by electrostatic shielding, further enhancing the battery stability and contributing to the long cycle lifetime. As a result, in the 0.99 M LiNO3−0.01 M KNO3−DMSO electrolyte, the Li-O2 batteries exhibit prolonged cycling performance (108 cycles) and excellent rate performance (2 A·g−1), significantly superior to the organic salt one.

Keywords: Li-O2 batteries, potassium ions, inorganic nitrate electrolyte, solution pathway mechanism

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Publication history
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Acknowledgements

Publication history

Received: 22 October 2023
Revised: 18 November 2023
Accepted: 20 November 2023
Published: 12 December 2023
Issue date: May 2024

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© Tsinghua University Press 2023

Acknowledgements

Acknowledgements

This work was financially supported by the National Key R&D Program of China (No. 2020YFE0204500), the National Natural Science Foundation of China (Nos. 52171194 and 52271140), the CAS Project for Young Scientists in Basic Research (No. YSBR-058), the Youth Innovation Promotion Association CAS (No. 2020230), and the National Natural Science Foundation of China Outstanding Youth Science Foundation of China (Overseas).

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