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Utilizing a Photocatalysis Process to Achieve a Cathode with Low Charging Overpotential and High Cycling Durability for a Li-O 2 Battery.
- Source :
-
Angewandte Chemie (International ed. in English) [Angew Chem Int Ed Engl] 2020 Nov 16; Vol. 59 (47), pp. 20909-20913. Date of Electronic Publication: 2020 Sep 11. - Publication Year :
- 2020
-
Abstract
- The practical applications of non-aqueous lithium-oxygen batteries are impeded by large overpotentials and unsatisfactory cycling durability. Reported here is that commonly encountered fatal problems can be efficiently solved by using a carbon- and binder-free electrode of titanium coated with TiO <subscript>2</subscript> nanotube arrays (TNAs) and gold nanoparticles (AuNPs). Ultraviolet irradiation of the TNAs generates positively charged holes, which efficiently decompose Li <subscript>2</subscript> O <subscript>2</subscript> and Li <subscript>2</subscript> CO <subscript>3</subscript> during recharging, thereby reducing the overpotential to one that is near the equilibrium potential for Li <subscript>2</subscript> O <subscript>2</subscript> formation. The AuNPs promote Li <subscript>2</subscript> O <subscript>2</subscript> formation, resulting in a large discharge capacity. The electrode exhibits excellent stability with about 100 % coulombic efficiency during continuous cycling of up to 200 cycles, which is due to the carbon- and binder-free composition. This work reveals a new strategy towards the development of highly efficient oxygen electrode materials for lithium-oxygen batteries.<br /> (© 2020 Wiley-VCH GmbH.)
Details
- Language :
- English
- ISSN :
- 1521-3773
- Volume :
- 59
- Issue :
- 47
- Database :
- MEDLINE
- Journal :
- Angewandte Chemie (International ed. in English)
- Publication Type :
- Academic Journal
- Accession number :
- 32761724
- Full Text :
- https://doi.org/10.1002/anie.202007906