Issue 25, 2024

Cross-linked K0.5MnO2 nanoflower composites for high rate and low overpotential Li–CO2 batteries

Abstract

Rechargeable Li–CO2 batteries are deemed to be attractive energy storage systems, as they can effectively inhale and fix carbon dioxide and possess an extremely high energy density. Unfortunately, the irreversible decomposition of the insoluble and insulating Li2CO3 results in awful electrochemical performance and inferior energy efficiency of Li–CO2 batteries. Furthermore, the low energy efficiency will exacerbate the extra waste of resources. Therefore, it is vital to design novel and efficient catalysts to enhance the battery performance. Herein, a facile, one-step strategy is introduced to design cross-linked, ultrathin K0.5MnO2 nanoflowers combined with CNTs (K0.5MnO2/CNT) as a highly efficient cathode for Li–CO2 batteries. Impressively, the Li–CO2 battery based on the K0.5MnO2/CNT cathode achieves a low overpotential (1.05 V) and a high average energy efficiency (87.95%) at a current density of 100 mA g−1. Additionally, the K0.5MnO2/CNT cathode can steadily run for over 100 cycles (overpotential < 1.20 V). Moreover, a low overpotential of 1.47 V can be obtained even at a higher current density of 1000 mA g−1, indicating the superior rate performance of K0.5MnO2/CNT. This strategy offers new insight and guidance for the development of low-cost and high-performance Li–CO2 batteries.

Graphical abstract: Cross-linked K0.5MnO2 nanoflower composites for high rate and low overpotential Li–CO2 batteries

Supplementary files

Article information

Article type
Edge Article
Submitted
18 Mar 2024
Accepted
14 May 2024
First published
14 May 2024
This article is Open Access

All publication charges for this article have been paid for by the Royal Society of Chemistry
Creative Commons BY-NC license

Chem. Sci., 2024,15, 9591-9598

Cross-linked K0.5MnO2 nanoflower composites for high rate and low overpotential Li–CO2 batteries

J. Wu, J. Chen, X. Chen, Y. Liu, Z. Hu, F. Lou, S. Chou and Y. Qiao, Chem. Sci., 2024, 15, 9591 DOI: 10.1039/D4SC01799D

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