A renaissance of: N, N -dimethylacetamide-based electrolytes to promote the cycling stability of Li-O2batteries

Yue Yu, Gang Huang, Jia Yi Du, Jia Zhi Wang, Ying Wang, Zhi Jian Wu, Xin Bo Zhang

Research output: Contribution to journalArticlepeer-review

13 Scopus citations

Abstract

Li-O2 batteries with ultrahigh theoretical energy density have been regarded as a promising successor to Li-ion batteries for next-generation energy storage. However, their practical application is still facing many critical issues, especially the lack of suitable electrolytes that can tolerate a strong oxidizing environment as well as being compatible with a Li metal anode. Here, we design a new N,N-dimethylacetamide (DMA)-based electrolyte by regulating the Li+ solvation structure under medium concentration to promote the cycling stability of Li-O2 batteries. And it is also a better lithium metal anode stabilization strategy than using high concentration electrolytes. In contrast to high concentration electrolytes with expensive cost, limited protection ability toward the Li anode, sluggish kinetics and slow mass transfer, this new electrolyte with intrinsic better endurance towards the rigorous oxidative species can simultaneously stabilize the Li anode by facilitating the formation of a LiF and LiNxOy coexisting solid electrolyte interphase (SEI) film and enable faster kinetics/mass transfer. As a result, both the symmetrical batteries (1800 hours) and the Li-O2 batteries (180 cycles) achieve the best cycling performances in DMA-based electrolytes to our knowledge. This study breathes new life into the electrolyte regulation strategy and paves the way for the development of alkali-O2 batteries. This journal is
Original languageEnglish (US)
Pages (from-to)3075-3081
Number of pages7
JournalEnergy and Environmental Science
Volume13
Issue number9
DOIs
StatePublished - Jul 18 2020

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