A Liquid/Liquid Electrolyte Interface that Inhibits Corrosion and Dendrite Growth of Lithium in Lithium‐Metal Batteries. (26th February 2020)

• Record Type: Journal Article
• Authors: He, Xiaofeng; Liu, Xiao; Han, Qing; Zhang, Peng; Song, Xiaosheng; Zhao, Yong
• Is Part Of: Angewandte Chemie. Volume 132:Number 16(2020)
• Page Start: 6459
• Page End: 6467
• Publication Date: 2020-02-26
• Subjects: Elektrolytgrenzflächen -- Fluorsilane -- Lithiumanoden -- Lithium-Metall-Batterien -- Lithium-Sauerstoff-Batterien; Chemistry -- Periodicals; 540
• DOI: 10.1002/ange.201914532
• Languages: English
• ISSNs: 0044-8249

Abstract

Abstract: A proof‐of‐concept study on a liquid/liquid (L/L) two‐phase electrolyte interface is reported by using the polarity difference of solvent for the protection of Li‐metal anode with long‐term operation over 2000 h. The L/L electrolyte interface constructed by non‐polar fluorosilicane (PFTOS) and conventionally polar dimethyl sulfoxide solvents can block direct contact between conventional electrolyte and Li anode, and consequently their side reactions can be significantly eliminated. Moreover, the homogeneous Li‐ion flow and Li‐mass deposition can be realized by the formation of a thin and uniform solid‐electrolyte interphase (SEI) composed of LiF, Li x C, Li x SiO y between PFTOS and Li anode, as well as the super‐wettability state of PFTOS to Li anode, resulting in the suppression of Li dendrite formation. The cycling stability in a lithium–oxygen battery as a model is improved 4 times with the L/L electrolyte interface. Abstract : Fließende Grenzen : Eine zweiphasige Flüssig‐flüssig(L/L)‐Elektrolytgrenzfläche wurde entworfen. Sie ist vorteilhaft für die Vermeidung von Korrosion und Dendritenwachstum der Li‐Elektrode und verbessert so deutlich die Zyklenstabilität der Li‐Elektrode sowie von Li‐Metall‐Batterien.