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Three-Dimensional Au Microlattices as Positive Electrodes for Li–O_2 Batteries

Xu, Chen and Gallant, Betar M. and Wunderlich, Phillip U. and Lohmann, Timm and Greer, Julia R. (2015) Three-Dimensional Au Microlattices as Positive Electrodes for Li–O_2 Batteries. ACS Nano, 9 (6). pp. 5876-5883. ISSN 1936-0851 . http://resolver.caltech.edu/CaltechAUTHORS:20150518-150949548

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Abstract

We demonstrate the feasibility of using a 3-dimensional gold microlattice with a periodic porous structure and independently tunable surface composition as a Li–O_2 battery cathode. The structure provides a platform for studying electrochemical reactions in architected Li–O_2 electrodes with large (300 μm) pore sizes. The lack of carbon and chemical binders in these Au microlattices enabled the investigation of chemical and morphological processes that occur on the surfaces of the microlattice during cycling. Li–O_2 cells with Au microlattice cathodes were discharged in 0.5 M lithium-bis(trifluoromethane)sulfonamide (LiTFSI) in a 1,2-dimethoxyethane (DME) electrolyte, with lithium metal foil as the anode. SEM analysis of microlattice cathodes after first discharge revealed the presence of toroidal-shaped 500–700 nm particles covering the surface of the electrode, which disappeared upon subsequent charging. Raman and FTIR spectroscopy analysis determined these particulates to be Li_2O_2. The morphology of discharge products evolved with cycling into micrometer-sized clusters of arranged “platelets”, with a higher amount of side reaction products such as Li_2CO_3 and LiOH. This work shows that properly designed 3-dimensional architected materials may provide a useful foundation for investigating fundamental surface electrochemistry while simultaneously enabling mechanical robustness and enhancing the surface area over a factor of 30 compared with a thin film with the same foot print.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1021/acsnano.5b00443DOIArticle
http://pubs.acs.org/doi/abs/10.1021/acsnano.5b00443PublisherArticle
http://pubs.acs.org/doi/suppl/10.1021/acsnano.5b00443Related ItemSupporting Information
ORCID:
AuthorORCID
Xu, Chen0000-0002-9427-0161
Greer, Julia R.0000-0002-9675-1508
Additional Information:© 2015 American Chemical Society. Received for review January 21, 2015, and accepted May 7, 2015. Publication Date (Web): May 7, 2015. This work is supported by the Bosch Energy Research Network (BERN). The authors gratefully acknowledge Kavli Nanoscience Institute at Caltech, Dr. Jake Christensen of Robert Bosch, LLC for fruitful discussions, and Prof. George Rossman of Caltech for his help with Raman and FTIR measurements.
Group:Kavli Nanoscience Institute
Funders:
Funding AgencyGrant Number
Bosch Energy Research Network (BERN)UNSPECIFIED
Subject Keywords:Li-O_2 battery; microlattice; polycrystalline Au; toroids
Record Number:CaltechAUTHORS:20150518-150949548
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20150518-150949548
Official Citation:Three-Dimensional Au Microlattices as Positive Electrodes for Li–O2 Batteries Chen Xu, Betar M. Gallant, Phillip U. Wunderlich, Timm Lohmann, and Julia R. Greer ACS Nano 2015 9 (6), 5876-5883 DOI: 10.1021/acsnano.5b00443
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:57619
Collection:CaltechAUTHORS
Deposited By: Ruth Sustaita
Deposited On:19 May 2015 03:04
Last Modified:31 Oct 2017 22:20

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