Shen X, Zhang S, Wu Y, Chen Y. Promoting Li-O
2 Batteries With Redox Mediators.
CHEMSUSCHEM 2019;
12:104-114. [PMID:
30444048 DOI:
10.1002/cssc.201802007]
[Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/31/2018] [Revised: 11/10/2018] [Indexed: 06/09/2023]
Abstract
Li-O2 batteries have a high theoretical specific energy, 3500 Wh kg-1 ; however, its practical capacity is far below this value and limited by the passivation with the insulating discharge product Li2 O2 . The nonconductive nature of Li2 O2 also impedes the charging process, leading to a low coulombic efficiency and high overpotential on charge even at a moderate rate. To address these challenges, redox mediators could be used both during discharge and charge to transfer electrons between O2 /electrode surface or Li2 O2 /electrode surface to overcome the passivation of Li2 O2 , which would facilitate the discharge and charge process. The capacity and current density were significantly improved using the redox mediators, thus representing a promising strategy to achieve a high energy density for Li-O2 batteries.
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