DABCOnium: An Efficient and High‐Voltage Stable Singlet Oxygen Quencher for Metal–O₂ Cells

Abstract

Singlet oxygen ( 1 O 2 ) causes a major fraction of the parasitic chemistry during the cycling of non‐aqueous alkali metal‐O 2 batteries and also contributes to interfacial reactivity of transition‐metal oxide intercalation compounds. We introduce DABCOnium, the mono alkylated form of 1,4‐diazabicyclo[2.2.2]octane (DABCO), as an efficient 1 O 2 quencher with an unusually high oxidative stability of ca. 4.2 V vs. Li/Li + . Previous quenchers are strongly Lewis basic amines with too low oxidative stability. DABCOnium is an ionic liquid, non‐volatile, highly soluble in the electrolyte, stable against superoxide and peroxide, and compatible with lithium metal. The electrochemical stability covers the required range for metal–O 2 batteries and greatly reduces 1 O 2 related parasitic chemistry as demonstrated for the Li–O 2 cell.

Electrolytes for Rechargeable Lithium–Air Batteries

“…Replacing some of the labile hydrogen atoms in the polymer chains with other functional groups or side chains is helpful to lower the number of potential reaction pathways for nucleophilic attack during battery operation. Antioxidants such as sterically hindered phenol or amine stabilizers can be added to suppress the deterioration of polymer electrolytes …”

“…Antioxidants such as sterically hindered phenol or amine stabilizers can be added to suppress the deterioration of polymer electrolytes. [153,154]…”

Fast determination of peroxymonosulfate by flow injection chemiluminescence using the Tb(III) ligand in micelle medium

“…Quenching experiments, ESR spin‐trapping techniques, CL, and fluorescence spectrum comparisons were conducted to identify the reactive species and elucidate the CL mechanism. 1,4‐Diazabicyclo[2.2.2]octane (DABCO) was always used as the quencher of singlet oxygen . The effects of different concentrations of DABCO on the CL signals in batch experiments are listed in Table .…”

An aggregation-induced emission dye-powered afterglow luminogen for tumor imaging

“…To further disclose the role of 1 O 2 during the interaction between PFPV and TTMN, a classic 1 O 2 quencher 1,4-diazabicyclo[2.2.2]octane (DABCO) was used for study. [60][61][62] As shown in Fig. 3d, to the solutions of PNPs and P-TNPs DABCO (250 mM, nal concentration) and an equal volume of H 2 O were pre-added, respectively, and then they were irradiated under a white LED light for 1 min, and nally imaged using an IVIS system with a bioluminescence mode.…”