High rate and long cycle life in Li-O2 batteries with highly efficient catalytic cathode configured with Co3O4 nanoflower
- China Univ. of Petroleum, Beijing (China). College of New Energy and Materials, Beijing Key Lab. of Biogas Upgrading Utilization, and State Key Lab. of Heavy Oil Processing
- Argonne National Lab. (ANL), Lemont, IL (United States). Chemical Science and Engineering Division
- Argonne National Lab. (ANL), Lemont, IL (United States). Materials Sciences Division
- Tehcnische Univ., Darmstadt (Germany). Eduard-Zintl-Institut für Anorganische und Physikalische Chemie
- Xiamen Univ., Fujian (China). State Key Lab. of PCOSS
- Argonne National Lab. (ANL), Lemont, IL (United States). Chemical Science and Engineering Division; Stanford Univ., CA (United States). Materials Science and Engineering
The reaction mechanism of non-aqueous Li-O2 batteries is based on the deposition and decomposition of Li2O2. The polarization of Li-O2 batteries can be rapidly increased by operation under a high rate condition, resulting in the early capacity fade of the cells. Therefore, a well-designed catalyst with a unique structure and excellent catalytic ability is an important way to boost the round-trip performance of Li-O2 batteries, especially under high current density. In this work, a unique nanoflower structure assembled with Co3O4 nanosheets is synthesized by using 2-methylimidazole (2-MIM) as a structural directing agent. X-ray photoelectron spectroscopy (XPS) and Raman spectra reveal abundant oxygen vacancies on the surface of the Co3O4 nanoflower, which are beneficial for oxygen reduction and evolution reactions and long round-trip lifetime. Density functional theory results demonstrate that Co3O4 catalyst with oxygen vacancies could promote the wetting of Li2O2 on substrate and formation of a Li2O2 nanofilm, thereby boosting the discharge capacity of Li-O2 batteries. On account of the synergistic effect of abundant oxygen vacancies, the unique structure, and excellent oxygen evolution reaction, Co3O4 nanoflower-based cells could deliver ultralong lifetime of 276 and 248 cycles with a discharge capacity of 1000 mAh g(-1) under charge/discharge current densities of 0.5 A g-1 and 1 A g-1, respectively. Finally, this study has shed light on a new strategy for catalyst preparation for long lifetime Li-O2 batteries.
- Research Organization:
- Argonne National Lab. (ANL), Argonne, IL (United States)
- Sponsoring Organization:
- National Key Research and Development Program (China); USDOE Office of Energy Efficiency and Renewable Energy (EERE) - Office of Vehicle Technologies (VTO); USDOE
- Grant/Contract Number:
- AC02-06CH11357
- OSTI ID:
- 1574815
- Alternate ID(s):
- OSTI ID: 1703058
- Journal Information:
- Nano Energy, Vol. 64, Issue C; ISSN 2211-2855
- Publisher:
- ElsevierCopyright Statement
- Country of Publication:
- United States
- Language:
- English
Web of Science
Similar Records
Surface Gradient Ti-Doped MnO2 Nanowires for High-Rate and Long-Life Lithium Battery
Nanostructured Conductive Metal Organic Frameworks for Sustainable Low Charge Overpotentials in Li–Air Batteries