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Porous Mn2O3 cathode for highly durable Li–CO2 batteries

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Abstract

Rechargeable Li–CO2 batteries are gaining increasing popularity for reversible electrochemical energy conversion and storage by utilization of the reactions between CO2 and Li metal. However, a high charging voltage (>4.0 V) should be applied to drive the electrochemical decomposition of the discharged products Li2CO3 and C, which results in a high charge overpotential and electrolyte decomposition. Therefore, low-cost and highly effective cathode catalysts are particularly desirable. Herein, porous-structured Mn2O3 was prepared via a facile sol–gel method and carefully characterized by SEM, TEM, XPS and Raman spectroscopy. As a cathode for Li–CO2 batteries, Mn2O3 shows superior catalytic activity and durable cycling stability (2000 h) at a current density of 50 mA g−1. Furthermore, the discharge products, Li2CO3 and C, were obtained and systematically studied using several experimental techniques. The C products obtained on the discharged Mn2O3 cathode exhibit highly graphitized features, as revealed by Raman spectroscopy and XPS. We believe that this study will promote the understanding of the Li–CO2 battery reaction mechanism and the development of highly effective low-cost cathode catalysts for Li–CO2 batteries.

Graphical abstract: Porous Mn2O3 cathode for highly durable Li–CO2 batteries

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Publication details

The article was received on 26 Jun 2018, accepted on 01 Oct 2018 and first published on 02 Oct 2018


Article type: Paper
DOI: 10.1039/C8TA06143B
Citation: J. Mater. Chem. A, 2018, Advance Article
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    Porous Mn2O3 cathode for highly durable Li–CO2 batteries

    W. Ma, S. Lu, X. Lei, X. Liu and Y. Ding, J. Mater. Chem. A, 2018, Advance Article , DOI: 10.1039/C8TA06143B

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