Ambilaterality of Redox Mediators towards 1O2 in Li‐O2 Batteries: Trap and Quencher. (2nd July 2021)

• Record Type: Journal Article
• Authors: Lee, Hyun‐Wook; Kim, Hun; Jung, Hun‐Gi; Sun, Yang‐Kook; Kwak, Won‐Jin
• Is Part Of: Advanced functional materials. Volume 31:Number 40(2021)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2021-07-02
• Subjects: lithium‐oxygen batteries -- redox mediators -- singlet oxygen; Materials -- Periodicals; Chemical vapor deposition -- Periodicals; 620.11
• DOI: 10.1002/adfm.202102442
• Languages: English
• ISSNs: 1616-301X

Abstract

Abstract: Lithium oxygen batteries (LOBs) are considered promising next‐generation lithium batteries owing to their high theoretical specific energy density. However, several issues must be addressed for realizing the practical applications of LOBs. Among them, the evolution of singlet oxygen ( 1 O2 )—which undergoes vigorous reactions that compromise the stability of the system—is a key challenge. The high overpotential induced by low‐conductivity lithium peroxide necessitates the use of a redox mediator (RM) to facilitate the charging process; however, RMs can also be degraded by 1 O2, which limits their efficacy in the long term. Recently, it was revealed that certain RMs play a role in suppressing the generation of 1 O2 . In this review, the relationship between the RM and 1 O2 is described. Based on recent understandings, clear insight into RM reactions toward 1 O2 and possible future research directions will be provided. Abstract : The working principle of redox mediators (RMs) toward singlet state oxygen intermediates (O2 2−, O 2−, Li2− x O2 ) and singlet oxygen ( 1 O2 ) in lithium–oxygen batteries is summarized. RMs can play the role of both trapping 1 O2 through an irreversible process and mitigating 1 O2 formation by reversibly quenching the singlet state oxygen species.