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2,4-Dimethoxy-2,4-dimethylpentan-3-one:一个在Li-O₂细胞中稳定的近溶剂

Daniel Sharon¹, Pessia Sharon¹, Daniel Hirshberg¹

¹Department of Chemistry and BINA (BIU Institute for Nano-Technology and Advanced Materials), Bar Ilan University , Ramat-Gan 5290002, Israel.

Journal of the American Chemical Society

|August 10, 2017

概括

一种新型的溶剂,2,4-二甲基-2,4-二甲基-3-一 (DMDMP),在氧细胞中显示出极好的稳定性. 虽然阳极限制了性能,但DMDMP是电化学系统的有希望的候选者.

科学领域:

电化学
材料科学
有机化学

背景情况:

-氧 (Li-O2) 电池对高能量密度存储具有前景.
发展稳定的电解质对于氧电池的性能至关重要.
现有的离子溶剂通常通过核友性攻击或与氧物种的反应降解.

研究的目的:

引入和评估一种新型的 aprotic 溶剂2,4-dimethoxy-2,4-dimethylpentan-3-one (DMDMP).
评估DMDMP在Li-O2细胞中的电化学稳定性和循环性能.
在基于DMDMP的Li-O2系统中确定降解途径和限制.

主要方法:

DMDMP 的合成和特征.
使用基于DMDMP的电解质的Li-O2细胞的电化学循环.
使用NMR和GC-MS等技术进行循环后分析,以评估溶剂降解.

主要成果:

对于核友性攻击和减少氧物种,DMDMP具有很高的稳定性.
使用DMDMP电解质的Li- O2细胞在最小的溶剂降解下成功循环.
容量衰减主要归因于阳极的不稳定性,而不是溶剂分解.
分析测量证实DMDMP降解是可以忽略的,即使在延长循环后.

结论:

DMDMP是一种高度稳定的离子溶剂,适用于氧电池应用.
溶剂对氧物种的抗性使其成为各种电化学系统的有价值候选者.
进一步的研究应集中在改善基于DMDMP的电解质中的阳极稳定性.

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