Journal
ACS ENERGY LETTERS
Volume 3, Issue 3, Pages 592-597Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsenergylett.8b00054
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Funding
- RIKEN, JST ALCA-SPRING
- National Research Foundation (NRF) of Korea [NRF-2016R1C1B2008690, NRF-2017R1A2B3010176]
- Nano Material Technology Development Program through the NRF - ministry of Science, ICT and Future Planning [2009-0082580]
- IPA fellowship at RIKEN
- SR center, Ritsumeikan University of Project for Creation of Research Platforms and Sharing of Advanced Research Infrastructure of MEXT [RS1401]
- Ministry of Science, ICT & Future Planning, Republic of Korea [KINC01] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
- National Research Foundation of Korea [2016R1C1B2008690] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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In lithium-oxygen (Li-O-2) batteries, nano catalysts have been widely employed as a means to suppress the large recharge overpotential and to possibly improve cyclability. However, these studies have consistently been mired with ambiguity relating to the possible exacerbation of side reactions, which in turn has brought into question the role of such catalysts in Li-O-2 cells. Here, we shed light on the viability of nanocatalysts by examining the use of Ru, Pt, Pd, Co3O4, and Au nanoparticles supported on carbon nanotubes in Li-O-2 cells. We show that while there can be noticeable reduction in overpotential with catalysts, the facile decomposition of Li2O2 is not accompanied by a decrease in side reactions, and as a consequence, there is no notable improvement in rechargeability or cyclability. Instead, highly active catalysts can exhibit nonselectivity for all oxidation reactions including Li2O2 and the electrolyte. This work underscores the importance of metrics beyond simple consideration of the recharge overpotential and the necessity of pursuing approaches that can promote reversible Li-O-2 electrochemistry.
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