Operando Synchrotron XRD of Bromide Mediated Li-O-2 Battery

Autor(es)

Cremasco, Leticia F. ^[1] ; Anchieta, Chayene G. ^[1] ; Nepel, Thayane C. M. ^[1] ; Miranda, Andre N. ^[1] ; Sousa, Bianca P. ^[1] ; Rodella, Cristiane B. ^[2] ; Filho, Rubens M. ^[1] ; Doubek, Gustavo ^[1]

Afiliação do(s) autor(es)

^[1] Univ Estadual Campinas, Ctr Innovat New Energies, Sch Chem Engn, Adv Energy Storage Div, Lab Adv Batteries LAB, Unic, BR-13083852 Campinas, SP - Brazil

^[2] Brazilian Ctr Res Energy & Mat CNPEM, Brazilian Synchrotron Light Lab LNLS, BR-13083100 Campinas, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: ACS APPLIED MATERIALS & INTERFACES; v. 13, n. 11, p. 13123-13131, MAR 24 2021.
• Citações Web of Science: 0

Resumo

Li-O-2 battery technology offers large theoretical energy density, considered a promising alternative energy storage technology for a variety of applications. One of the main advances made in recent years is the use of soluble catalysts, known as redox mediators (RM), decreasing the charge overpotential and improving cyclability. Despite its potential, much is still unknown regarding its dynamic, especially over higher loading electrodes, where mass transport may be an issue and the interplay with common impurities in the electrolyte, like residual water. Here we perform for the first time an operando XRD characterization of a DMSO-based LiBr mediated Li-O-2 battery with a high loading electrode based on CNTs aiming to reveal these dynamics and track chemical changes in the electrode. Our results show that, depending on the electrode architecture, the system's issue can move from catalytic to a mass transfer. We also assess the effect of residual water in the system to better understand the reaction routes. As a result, we observed that with DMSO, the system is even more sensitive to water contamination compared to glyme-based studies reported in the literature. Despite the activity of LiBr on the Li-peroxide oxidation and its contribution to cyclability, with the system and electrode configuration used in this study, we verified that a mass transfer limitation caused a cell ``sudden death{''} caused by clogging after cycling. (AU)

• Processo FAPESP: 17/11958-1 - CINE - Divisão para Armazenamento de Energia Avançado
• Beneficiário: Rubens Maciel Filho
• Modalidade de apoio: Auxílio à Pesquisa - Programa Centros de Pesquisa em Engenharia