title: Investigation on the Cyclability of Lithium-Oxygen Cells in a Confined Potential Window using Cathodes with Pre-filled Discharge Products.
abstract: With new chemistry and advantageous configuration, the lithium-oxygen (Li-O2) battery promises a much higher specific energy than traditional lithium-ion batteries. The limited understanding on the complicated battery reactions therein, however, has become a major bottleneck of its development for applications requiring a high energy efficiency and long cycle-life. Herein, in a confined potential window with negligible electrolyte degradation, we studied the rechargeability of Li-O2 cathodes with pre-filled well-defined discharge products of Li2O2, Li2CO3, LiOH, or their combinations. Our results suggest Li2CO3 as the most difficult species to be electrochemically decomposed among the three lithium compounds, whereas the presence of LiOH notably increases the initial charge potential. The clearly visible difference in the charge behavior and cycling stability of these artificially "discharged" electrodes provides a guideline for the development of future high-performance Li-O2 batteries.
authors.affiliation: Institute of Materials Research and Engineering (IMRE), A*STAR (Agency for Science, Technology and Research), 3 Research Link, Singapore, 117602, Republic of Singapore.
authors.forename: Dongsheng
authors.initials: D
authors.lastname: Geng
authors.affiliation: Institute of Materials Research and Engineering (IMRE), A*STAR (Agency for Science, Technology and Research), 3 Research Link, Singapore, 117602, Republic of Singapore.
authors.forename: Ning
authors.initials: N
authors.lastname: Ding
authors.affiliation: Institute of Materials Research and Engineering (IMRE), A*STAR (Agency for Science, Technology and Research), 3 Research Link, Singapore, 117602, Republic of Singapore. andyhor@nus.edu.sg.|Department of Chemistry, National University of Singapore, 3 Science Drive 3, Singapore, 117543, Republic of Singapore. andyhor@nus.edu.sg.
authors.forename: T S Andy
authors.initials: TS
authors.lastname: Hor
authors.affiliation: Institute of Materials Research and Engineering (IMRE), A*STAR (Agency for Science, Technology and Research), 3 Research Link, Singapore, 117602, Republic of Singapore.
authors.forename: Sheau Wei
authors.initials: SW
authors.lastname: Chien
authors.affiliation: Institute of Materials Research and Engineering (IMRE), A*STAR (Agency for Science, Technology and Research), 3 Research Link, Singapore, 117602, Republic of Singapore. zl-liu@imre.a-star.edu.sg.
authors.forename: Zhaolin
authors.initials: Z
authors.lastname: Liu
authors.affiliation: Institute of Materials Research and Engineering (IMRE), A*STAR (Agency for Science, Technology and Research), 3 Research Link, Singapore, 117602, Republic of Singapore. y-zong@imre.a-star.edu.sg.
authors.forename: Yun
authors.initials: Y
authors.lastname: Zong
keywords: cyclability; electrolyte decomposition; lithium-oxygen battery; oxygen evolution reaction; safe potential window