Singlet oxygen formation in Na O2 battery cathodes catalyzed by ammonium Brönsted acid

Lozano, I.B.; Córdoba, Daniel; Rodríguez, Hernán B.; Landa‐Medrano, Imanol; Ortiz‐Vitoriano, Nagore; Rojo, Teófilo; Larramendi, Idoia Ruiz de; Calvo, Ernesto J.

doi:10.1016/j.jelechem.2020.114265

Cited by 15 publications

(15 citation statements)

References 35 publications

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“…We should note that a distinct result was found in Na–O 2 cells. Lozano et al [21b] . reported that the addition of Brønsted‐Lowry acid NH 4 + generated 1 O 2 through the H + ‐mediated O 2 .− disproportionation, which provided larger 1 O 2 amount compared to the absence of the H + source.…”

Section: O2 Formation Via Superoxide Disproportionationmentioning

confidence: 99%

Singlet Oxygen in Lithium−Oxygen Batteries

Hong

Byon

2020

Batteries & Supercaps

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Singlet oxygen (1O2) is one of the most critical species leading to parasitic side reactions and poor reversibility in non‐aqueous Li−O2 batteries. 1O2 is generated via the disproportionation of the superoxide radical (O2.−) in O2/Li2O2 electrochemistry. The mechanistic and computational studies on 1O2 formation revealed the significant roles of the associated cations, solvation ability of aprotic solvents, H+ source, and catalyst/electrode materials. Along with efforts to alleviate 1O2 production, trapping and eliminating 1O2 have been attempted using molecular agents. Anthracene derivatives trap 1O2 and form endoperoxides, which can be quantitatively detected using in situ fluorescence analysis. Physical quenchers that convert 1O2 to 3O2 are desirable for cycling of Li−O2 cells because quencher molecules are reusable. We highlight the recent reports on the formation and elimination of 1O2, and challenges and perspectives of suppressing the 1O2 effect on the performance of Li−O2 cells.

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Section: O2 Formation Via Superoxide Disproportionationmentioning

confidence: 99%

Singlet Oxygen in Lithium−Oxygen Batteries

Hong

Byon

2020

Batteries & Supercaps

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“…[176] Recently, the presence of singlet oxygen in aprotic metal-O 2 batteries is recognized as one of the major reason for the degradation of the electrolyte. [177][178][179] The study of the mechanisms involved in its generation is unequivocal in order to mitigate its harmful influence on the performance of this type of batteries.…”

Section: From Na-ion To Na-airmentioning

confidence: 99%

Na‐Ion Batteries—Approaching Old and New Challenges

Goikolea

Palomares

Wang

et al. 2020

Advanced Energy Materials

349

190

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are proving to be an emergent technology with potentially very attractive properties. They are potentially low cost and environmentally friendly with reduced supply risk. However, the development of NIBs faces various challenges such as low gravimetric and volumetric energy densities and difficulty in achieving broader voltage windows. Although early studies in NIBs date back to the 1970s, just like Li-ion battery (LIB) research, the commercialization of the former systems in 1991 by the team formed by Sony and Asahi Kasei marked a milestone not only in the field of energy storage technology but also in the evolution of the modern society. This technological breakthrough had been possible thanks to several preceding contributions, particularly the works by M. S Whittingham, [1] J. Goodenough, [2,3] and A. Yoshino [4] on the discovery of Li-ion intercalation materials (Nobel Laureates in Chemistry 2019). This important historical event polarized material science research toward Li-ion technology and slowed down considerably the advances in the field of sodium. However, at the end of the 2000s, mainly driven by the concerns about future lithium supply and the uneven worldwide distribution of its reserves and resources, the research on Na-ion reemerged and so did the number of articles published (Figure 1). The intercalation chemistry of both metal ions is very alike, and thus, the materials tested for NIBs could be similar to those used in Li-ion systems. Both systems share the same working principle, and therefore, in terms of manufacturing, the industry producing LIBs can be easily tuned towards NIB fabrication, which is an important asset to invest in and support this technology. NIBs started to reach the market in the early 2010s, about two decades after their Li counterparts. Nevertheless, the progress has been relatively fast due to the straightforward LIB equipment and facility transfer just mentioned. In the search of high performance, low cost, abundance, low environmental impact, long-term cyclability and safety, layered metal oxides, polyanionic compounds and Prussian blue analogues (PBAs) are among the most studied families of Na-ion cathode materials. On the anode side, metallic sodium exhibits the same operation and safety problems as lithium, and therefore, it cannot be considered an option in conventional NIBs. Thus, in this scenario, most of the research has been dominated by the use of disordered carbons, mainly hard carbons (HCs). Other prospective anodes

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“…It is known that the superoxide anion disproportionation leads to the formation of singlet oxygen in organic solvents with low water content when the amount of water is enough to hexacoordinate the dissolved O 2 -. 25,26,[46][47][48] When this condition is met, disproportionation results in hydrogen peroxide and singlet oxygen which triggers chemical solvent degradation. The resulting electrochemically unstable species would then further oxidize during the anodic sweep, leading to an acceleration of CO 2 evolution.…”

Section: Stability Of Diglyme and The Effect Of Water Contentmentioning

confidence: 99%