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The water catalysis at oxygen cathodes of lithium–oxygen cells

Lithium–oxygen cells have attracted extensive interests due to their high theoretical energy densities. The main challenges are the low round-trip efficiency and cycling instability over long time. However, even in the state-of-the-art lithium–oxygen cells the charge potentials are as high as 3.5 V...

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Autores principales: Li, Fujun, Wu, Shichao, Li, De, Zhang, Tao, He, Ping, Yamada, Atsuo, Zhou, Haoshen
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Pub. Group 2015
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4525193/
https://www.ncbi.nlm.nih.gov/pubmed/26206379
http://dx.doi.org/10.1038/ncomms8843
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author Li, Fujun
Wu, Shichao
Li, De
Zhang, Tao
He, Ping
Yamada, Atsuo
Zhou, Haoshen
author_facet Li, Fujun
Wu, Shichao
Li, De
Zhang, Tao
He, Ping
Yamada, Atsuo
Zhou, Haoshen
author_sort Li, Fujun
collection PubMed
description Lithium–oxygen cells have attracted extensive interests due to their high theoretical energy densities. The main challenges are the low round-trip efficiency and cycling instability over long time. However, even in the state-of-the-art lithium–oxygen cells the charge potentials are as high as 3.5 V that are higher by 0.70 V than the discharge potentials. Here we report a reaction mechanism at an oxygen cathode, ruthenium and manganese dioxide nanoparticles supported on carbon black Super P by applying a trace amount of water in electrolytes to catalyse the cathode reactions of lithium–oxygen cells during discharge and charge. This can significantly reduce the charge overpotential to 0.21 V, and results in a small discharge/charge potential gap of 0.32 V and superior cycling stability of 200 cycles. The overall reaction scheme will alleviate side reactions involving carbon and electrolytes, and shed light on the construction of practical, rechargeable lithium–oxygen cells.
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spelling pubmed-45251932015-09-04 The water catalysis at oxygen cathodes of lithium–oxygen cells Li, Fujun Wu, Shichao Li, De Zhang, Tao He, Ping Yamada, Atsuo Zhou, Haoshen Nat Commun Article Lithium–oxygen cells have attracted extensive interests due to their high theoretical energy densities. The main challenges are the low round-trip efficiency and cycling instability over long time. However, even in the state-of-the-art lithium–oxygen cells the charge potentials are as high as 3.5 V that are higher by 0.70 V than the discharge potentials. Here we report a reaction mechanism at an oxygen cathode, ruthenium and manganese dioxide nanoparticles supported on carbon black Super P by applying a trace amount of water in electrolytes to catalyse the cathode reactions of lithium–oxygen cells during discharge and charge. This can significantly reduce the charge overpotential to 0.21 V, and results in a small discharge/charge potential gap of 0.32 V and superior cycling stability of 200 cycles. The overall reaction scheme will alleviate side reactions involving carbon and electrolytes, and shed light on the construction of practical, rechargeable lithium–oxygen cells. Nature Pub. Group 2015-07-24 /pmc/articles/PMC4525193/ /pubmed/26206379 http://dx.doi.org/10.1038/ncomms8843 Text en Copyright © 2015, Nature Publishing Group, a division of Macmillan Publishers Limited. All Rights Reserved. http://creativecommons.org/licenses/by/4.0/ This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article's Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/
spellingShingle Article
Li, Fujun
Wu, Shichao
Li, De
Zhang, Tao
He, Ping
Yamada, Atsuo
Zhou, Haoshen
The water catalysis at oxygen cathodes of lithium–oxygen cells
title The water catalysis at oxygen cathodes of lithium–oxygen cells
title_full The water catalysis at oxygen cathodes of lithium–oxygen cells
title_fullStr The water catalysis at oxygen cathodes of lithium–oxygen cells
title_full_unstemmed The water catalysis at oxygen cathodes of lithium–oxygen cells
title_short The water catalysis at oxygen cathodes of lithium–oxygen cells
title_sort water catalysis at oxygen cathodes of lithium–oxygen cells
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4525193/
https://www.ncbi.nlm.nih.gov/pubmed/26206379
http://dx.doi.org/10.1038/ncomms8843
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