Dr. Jun Lu教授访问E01小组 A Nanostructured Cathode Architecture for Low Charge Overpotential in Lithium-Oxygen Batteries

时间: 
Mon, 10/19/2015 - 10:30
地点: 
中科院物理研究所 D210 会议室

 


Abstract:

The  lithium-oxygen battery, of much interest due to its very high energy density, presents many challenges, one of which is a high charge overpotential  that results in large inefficiencies. Here we report a cathode architecture based on nanoscale components that results in a dramatic reduction in charge overpotential (to ~0.2 V). The cathode utilizes atomic layer deposition of palladium nanoparticles on a carbon surface with an alumina coating for passivation of carbon defect sites. The low charge potential is enabled by the combination of palladium nanoparticles attached to the carbon cathode surface, a nanocrystalline form of lithium peroxide with grain boundaries, and the alumina coating preventing electrolyte decomposition on carbon. High resolution transmission electron microscopy provides evidence for the nanocrystalline form of lithium peroxide. The new cathode material architecture provides the basis for future development of lithium-oxygen cathode materials that can be used to improve the efficiency and extend cycle life.

报告人简介:

Dr. Jun Lu is a chemist at Argonne National Laboratory. His research interests focus on the electrochemical energy storage and conversion technology, with main focus on beyond Li-ion battery technology. Dr. Lu earned his bachelor degree in Chemistry Physics from University of Science and Technology of China (USTC) in 2000. He completed his Ph.D. from the Department of Metallurgical Engineering at University of Utah in 2009 with a major research on metal hydrides for reversible hydrogen storage application. He is the awardee of the first DOE-EERE postdoctoral fellow under Vehicles Technology Program from 2011-2013. Dr. Lu has authored/co-authored more than 150 peer-reviewed research articles, including Chem. Rev.; Nature Commun.; JACS; Nature Reviews Materials, etc, and has filed over dozen patents and patent applications

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