BRIEF STUDY ON THE DECOMPOSITION OF TETRAETHYLENE GLYCOL DIMETHYL ETHER (TEGDME) SOLVENT IN THE PRESENCE OF Li 2 O 2 AND H 2 O 2

Journal of The Chilean Chemical Society

article

Paulina MáRquez¹  Mauricio Moncada-Basualto²  Claudio Olea-Azar²  Francisco Herrera³  Macarena GarcíA⁴  MaríA J. Aguirre³ 

[1] Departamento de Física, Universidad de Santiago de Chile, Av. B. O’Higgins 3363, Estación Central;Laboratory of Free Radicals and Antioxidants. Faculty of Chemical and Pharmaceutical Sciences, University of Chile;Departamento de Química de los Materiales, Facultad de Química y Biología, Universidad de Santiago de Chile, Av. B. O’Higgins 3363, Estación Central;Laboratorio de Procesos Fotónicos y Electroquímicos, Departamento de Ciencias y Geografía, Universidad de Playa Ancha

关键词: Carbon-centered radicals;    Li-O2 cell;    oxygen-centered radicals;    hydrogen peroxide;    lithium peroxide;    tetraethylene glycol dimethyl ether decomposition;   

DOI  :  10.4067/s0717-97072021000405316

学科分类：化学（综合）

来源: Sociedad Chilena de Quimica

【 摘 要 】

In this work, the decomposition of the solvent tetraethylene glycol dimethyl ether (TEGDME) was studied under conditions that simulate the charge of a Li-O2 cell in the presence and absence of hydrogen peroxide and lithium peroxide by means of electron spin resonance spectroscopy (ESR). We detected the formation of radical species, although in low concentrations, originating from solvent decomposition reactions during the oxidation process, in the absence of peroxides. On the other hand, by introducing H2O2 and H2O into the system, oxygen-centered superoxide and hydroxyl radical species were detected. Furthermore, in the presence of Li-O2, carbon-centered radical species were detected which clearly show the decomposition of the solvent. Finally, the results show that it is very important that the charging process of a Li-O2 cell is carried out by direct oxidation via 2 e– to Li2O2 to avoid the formation of radical species that the decomposition of the solvent.

【 授权许可】

Unknown