Limited effects of a redox mediator in lithium-oxygen batteries: indecomposable by-products

Authors
Kim, HunKwak, Won-JinJung, Hun-GiSun, Yang-Kook
Issue Date
2020-03-21
Publisher
ROYAL SOC CHEMISTRY
Citation
JOURNAL OF MATERIALS CHEMISTRY A, v.8, no.11, pp.5622 - 5628
Abstract
Redox mediators have been studied intensively to improve the energy efficiency and cycle life of lithium-oxygen batteries by facilitating the decomposition of the discharge product (lithium peroxide), thus reducing the side reactions at a high potential during charging. Nevertheless, the cycling performance of lithium-oxygen batteries with redox mediators is unsatisfactory; this problem must be resolved for the successful application of redox mediators. In this study, we confirmed that a redox mediator cannot decompose the by-products on the cathode, leading to the passivation of the cathode surface despite the successful decomposition of lithium peroxide by the redox mediator. By schematizing the routes for by-product formation, we described the processes by which the by-products are accumulated on the cathode in the absence and presence of a redox mediator. Based on the intuitive verification of the unproven relationship between a redox mediator and the by-products, we proposed a complementary strategy to overcome the limitations of the redox mediator and prevent the accumulation of the by-products, which is essential for the improvement of lithium-oxygen batteries.
Keywords
LI-O-2 BATTERIES; SOLID-ELECTROLYTE; CYCLING STABILITY; CARBON; PERFORMANCE; DISCHARGE; LIMITATIONS; REDUCTION; CAPACITY; LI-O-2 BATTERIES; SOLID-ELECTROLYTE; CYCLING STABILITY; CARBON; PERFORMANCE; DISCHARGE; LIMITATIONS; REDUCTION; CAPACITY
ISSN
2050-7488
URI
https://pubs.kist.re.kr/handle/201004/118841
DOI
10.1039/c9ta13612f
Appears in Collections:
KIST Article > 2020
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