Synthesis of a metallic mesoporous pyrochlore as a catalyst for lithium-O2 batteries
- Synthesis of a metallic mesoporous pyrochlore as a catalyst for lithium-O2 batteries
- 오시형; Black, Robert; Pomerantseva, Ekaterina; Lee, Jin-Hyon; Nazar, Linda F.
- lithium-air battery; catalyst; oxygen reduction reaction; oxygen evolution reaction; pyrochlore; metallic oxide; mesoporous
- Issue Date
- NATURE CHEMISTRY
- VOL 4, NO 12, 1004-1010
- The lithium–O2 ‘semi-fuel’ cell based on the reversible reaction of Li and O2 to form Li2O2 can theoretically provide energy
densities that exceed those of Li-ion cells by up to a factor of five. A key limitation that differentiates it from other lithium
batteries is that it requires effective catalysts (or ‘promoters’) to enable oxygen reduction and evolution. Here, we report
the synthesis of a novel metallic mesoporous oxide using surfactant templating that shows promising catalytic activity and
results in a cathode with a high reversible capacity of 10,000 mAh g-1 (~1,000 mAh g-1 with respect to the total
electrode weight including the peroxide product). This oxide also has a lower charge potential for oxygen evolution from
Li2O2 than pure carbon. The properties are explained by the high fraction of surface defect active sites in the metallic
oxide, and its unique morphology and variable oxygen stoichiometry. This strategy for creating porous metallic oxides may
pave the way to new cathode architectures for the Li–O2 cell.
- Appears in Collections:
- KIST Publication > Article
- Files in This Item:
There are no files associated with this item.
- RIS (EndNote)
- XLS (Excel)
Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.