Ontology type: schema:ScholarlyArticle Open Access: True
2019-02-05
AUTHORSJinqiang Zhang, Bing Sun, Yufei Zhao, Anastasia Tkacheva, Zhenjie Liu, Kang Yan, Xin Guo, Andrew M. McDonagh, Devaraj Shanmukaraj, Chengyin Wang, Teofilo Rojo, Michel Armand, Zhangquan Peng, Guoxiu Wang
ABSTRACTDue to the high theoretical specific energy, the lithium-oxygen battery has been heralded as a promising energy storage system for applications such as electric vehicles. However, its large over-potentials during discharge-charge cycling lead to the formation of side-products, and short cycle life. Herein, we report an ionic liquid bearing the redox active 2,2,6,6-tetramethyl-1-piperidinyloxy moiety, which serves multiple functions as redox mediator, oxygen shuttle, lithium anode protector, as well as electrolyte solvent. The additive contributes a 33-fold increase of the discharge capacity in comparison to a pure ether-based electrolyte and lowers the over-potential to an exceptionally low value of 0.9 V. Meanwhile, its molecule facilitates smooth lithium plating/stripping, and promotes the formation of a stable solid electrolyte interface to suppress side-reactions. Moreover, the proportion of ionic liquid in the electrolyte influences the reaction mechanism, and a high proportion leads to the formation of amorphous lithium peroxide and a long cycling life (> 200 cycles). In particular, it enables an outstanding electrochemical performance when operated in air. More... »
PAGES602
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DOIhttp://dx.doi.org/10.1038/s41467-019-08422-8
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