部分
氧化还原
锂(药物)
超氧化物
化学
电解质
氧气
光化学
溶剂
过氧化物
组合化学
无机化学
有机化学
物理化学
电极
医学
酶
内分泌学
作者
Jonghak Kim,Jinhyeon Jeong,Gwan Yeong Jung,Jeongin Lee,Ji Eun Lee,Kyungeun Baek,Seok Ju Kang,Sang Kyu Kwak,Chihyun Hwang,Hyun-Kon Song
标识
DOI:10.1021/acsami.2c07400
摘要
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.
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