Details

Autor(en) / Beteiligte

• Kim, Jonghak
• Jeong, Jinhyeon
• Jung, Gwan Yeong
• Lee, Jeongin
• Lee, Ji Eun
• Baek, Kyungeun
• Kang, Seok Ju
• Kwak, Sang Kyu
• Hwang, Chihyun
• Song, Hyun-Kon

Titel

Amphi-Active Superoxide-Solvating Charge Redox Mediator for Highly Stable Lithium–Oxygen Batteries

Ist Teil von

• ACS applied materials & interfaces, 2022-09, Vol.14 (36), p.40793-40800

Ort / Verlag

American Chemical Society

Erscheinungsjahr

2022

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• A multifunctional electrolyte additive for lithium oxygen batteries (LOBs) was designed to have (1) a redox-active moiety to mediate decomposition of lithium peroxide (Li2O2 as the final discharge product) during charging and (2) a solvent moiety to solvate and stabilize lithium superoxide (LiO2 as the intermediate discharge product) in electrolyte during discharging. 4-Acetamido-TEMPO (TEMPO = 2,2,6,6-tetramethylpiperidin-1-yl)­oxyl) or AAT was employed as the additive working for both charge and discharge processes (amphi-active). The redox-active moiety was rooted in TEMPO, while the acetamido (AA) functional group inherited the high donor number (DN) of N,N-dimethylacetamide (DMAc). Integrating two functional moieties (TEMPO and AA) into a single molecule resulted in the bifunctionality of AAT (1) facilitating Li2O2 decomposition by the TEMPO moiety and (2) encouraging the solvent mechanism of Li2O2 formation by the high-DN AA moiety. Significantly improved LOB performances were achieved by the superoxide-solvating charge redox mediator, which were not obtained by a simple cocktail of TEMPO and DMAc.