Details

Autor(en) / Beteiligte

• Zhang, Jinqiang
• Sun, Bing
• Zhao, Yufei
• Tkacheva, Anastasia
• Liu, Zhenjie
• Yan, Kang
• Guo, Xin
• McDonagh, Andrew M
• Shanmukaraj, Devaraj
• Wang, Chengyin
• Rojo, Teofilo
• Armand, Michel
• Peng, Zhangquan
• Wang, Guoxiu

Titel

A versatile functionalized ionic liquid to boost the solution-mediated performances of lithium-oxygen batteries

Ist Teil von

• Nature communications, 2019-02, Vol.10 (1), p.602-10, Article 602

Ort / Verlag

England: Nature Publishing Group

Erscheinungsjahr

2019

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• Due 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.