A lithium-oxygen battery based on lithium superoxide

Title
A lithium-oxygen battery based on lithium superoxide
Author
선양국
Keywords
REDUCED GRAPHENE OXIDE; AUGMENTED-WAVE METHOD; LI-O-2 BATTERIES; FUEL-CELLS; STABILITY; CATALYST; DISPROPORTIONATION; ARCHITECTURE; REDUCTION; ELECTRODE
Issue Date
2016-01
Publisher
NATURE PUBLISHING GROUP
Citation
NATURE, v. 529, NO 7586, Page. 377-377
Abstract
Batteries based on sodium superoxide and on potassium superoxide have recently been reported(1-3). However, there have been no reports of a battery based on lithium superoxide (LiO2), despite much research(4-8) into the lithium-oxygen (Li-O-2) battery because of its potential high energy density. Several studies(9-16) of Li-O-2 batteries have found evidence of LiO2 being formed as one component of the discharge product along with lithium peroxide (Li2O2). In addition, theoretical calculations have indicated that some forms of LiO2 may have a long lifetime(17). These studies also suggest that it might be possible to form LiO2 alone for use in a battery. However, solid LiO2 has been difficult to synthesize in pure form(18) because it is thermodynamically unstable with respect to disproportionation, giving Li2O2 (refs 19, 20). Here we show that crystalline LiO2 can be stabilized in a Li-O-2 battery by using a suitable graphene-based cathode. Various characterization techniques reveal no evidence for the presence of Li2O2. A novel templating growth mechanism involving the use of iridium nanoparticles on the cathode surface may be responsible for the growth of crystalline LiO2. Our results demonstrate that the LiO2 formed in the Li-O-2 battery is stable enough for the battery to be repeatedly charged and discharged with a very low charge potential (about 3.2 volts). We anticipate that this discovery will lead to methods of synthesizing and stabilizing LiO2, which could open the way to high-energy-density batteries based on LiO2 as well as to other possible uses of this compound, such as oxygen storage.
URI
https://www.nature.com/nature/journal/v529/n7586/full/nature16484.htmlhttp://hdl.handle.net/20.500.11754/30439
ISSN
0028-0836; 1476-4687
DOI
10.1038/nature16484
Appears in Collections:
COLLEGE OF ENGINEERING[S](공과대학) > ENERGY ENGINEERING(에너지공학과) > Articles
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