A Mo2C/Carbon Nanotube Composite Cathode for Lithium-Oxygen Batteries with High Energy Efficiency and Long Cycle Life

Title
A Mo2C/Carbon Nanotube Composite Cathode for Lithium-Oxygen Batteries with High Energy Efficiency and Long Cycle Life
Author
선양국
Keywords
lithium oxygen batteries; nanostructures; molybdenum carbide nanoparticles; carbon nanotube; oxygen evolution reaction
Issue Date
2015-04
Publisher
AMER CHEMICAL SOC
Citation
ACS NANO, v. 9, NO 4, Page. 4129-4137
Abstract
Although lithium oxygen batteries are attracting considerable attention because of the potential for an extremely high energy density, their practical use has been restricted owing to a low energy efficiency and poor cycle life compared to lithium-ion batteries. Here we present a nanostructured cathode based on molybdenum carbide nanoparticles (Mo2C) dispersed on carbon nanotubes, which dramatically increase the electrical efficiency up to 88% with a cycle life of more than 100 cycles. We found that the Mo2C nanoparticle catalysts contribute to the formation of well-dispersed lithium peroxide nanolayers (Li2O2) on the Mo2C/carbon nanotubes with a large contact area during the oxygen reduction reaction (ORR). This Li2O2 structure can be decomposed at low potential upon the oxygen evolution reaction (OER) by avoiding the energy loss associated with the decomposition of the typical Li2O2 discharge products.
URI
http://pubs.acs.org/doi/abs/10.1021/acsnano.5b00267http://hdl.handle.net/20.500.11754/23705
ISSN
1936-0851; 1936-086X
DOI
10.1021/acsnano.5b00267
Appears in Collections:
COLLEGE OF ENGINEERING[S](공과대학) > ENERGY ENGINEERING(에너지공학과) > Articles
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