Petit Yann K, Leypold Christian, Mahne Nika, Mourad Eléonore, Schafzahl Lukas, Slugovc Christian, Borisov Sergey M, Freunberger Stefan A
Institute for Chemistry and Technology of Materials, Graz University of Technology, Stremayrgasse 9, 8010, Graz, Austria.
Institute for Analytical Chemistry and Food Chemistry, Graz University of Technology, Stremayrgasse 9, 8010, Graz, Austria.
Angew Chem Int Ed Engl. 2019 May 13;58(20):6535-6539. doi: 10.1002/anie.201901869. Epub 2019 Apr 9.
Singlet oxygen ( O ) causes a major fraction of the parasitic chemistry during the cycling of non-aqueous alkali metal-O 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 O 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 batteries and greatly reduces O related parasitic chemistry as demonstrated for the Li-O cell.
单线态氧（O）在非水碱金属-O电池的循环过程中引发了大部分寄生化学反应，并且也对过渡金属氧化物插层化合物的界面反应性有贡献。我们引入了1,4-二氮杂双环[2.2.2]辛烷（DABCO）的单烷基化形式——二氮杂环庚三烯鎓，作为一种高效的O猝灭剂，其相对于Li/Li具有约4.2 V的异常高的氧化稳定性。先前的猝灭剂是氧化稳定性过低的强路易斯碱性胺。二氮杂环庚三烯鎓是一种离子液体，不挥发，在电解质中高度可溶，对超氧化物和过氧化物稳定，并且与锂金属兼容。其电化学稳定性涵盖了金属-O电池所需的范围，并如锂-氧电池所示，极大地减少了与O相关的寄生化学反应。
Zotero 插件