Unexpected Li2O2 Film Growth on Carbon Nanotube Electrodes with CeO2 Nanoparticles in Li-O-2 Batteries

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In lithium-oxygen (Li-O-2) batteries, it is believed that lithium peroxide (Li2O2) electrochemically forms thin films with thicknesses less than 10 nm resulting in capacity restrictions due to limitations in charge transport. Here we show unexpected Li2O2 film growth with thicknesses of similar to 60 nm on a three-dimensional carbon nanotube (CNT) electrode incorporated with cerium dioxide (ceria) nanoparticles (CeO2 NPs). The CeO2 NPs favor Li2O2 surface nucleation owing to their strong binding toward reactive oxygen species (e.g., O-2 and LiO2). The subsequent film growth results in thicknesses of similar to 40 nm (at cutoff potential of 2.2 V vs Li/Li+), which further increases up to similar to 60 nm with the addition of trace amounts of H2O that enhances the solution free energy. This suggests the involvement of solvated superoxide species (LiO2(sol)) that precipitates on the existing Li2O2 films to form thicker films via disproportionation. By comparing toroidal Li2O2 formed solely from LiO2(sol), the thick Li2O2 films formed from surface-mediated nucleation/thin-film growth following by LiO2(sol) deposition provides the benefits of higher reversibility and rapid surface decomposition during recharge
Publisher
AMER CHEMICAL SOC
Issue Date
2016-05
Language
English
Article Type
Article
Keywords

LITHIUM-OXYGEN BATTERIES; CHARGE-TRANSPORT; RAMAN-SPECTROSCOPY; AIR BATTERIES; PEROXIDE; CATALYSTS; XPS; DECOMPOSITION; MORPHOLOGY; CAPACITY

Citation

NANO LETTERS, v.16, no.5, pp.2969 - 2974

ISSN
1530-6984
DOI
10.1021/acs.nanolett.5b05006
URI
http://hdl.handle.net/10203/209502
Appears in Collection
CH-Journal Papers(저널논문)
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