Li-O2 batteries gain widespread attention as a candidate for next-generation energy storage devices due to their extraordinary theoretic specific energy.The semi-open structure of Li-O2 batteries causes many parasitic reactions,especially related to water.Water is a double-edged sword,which destroys Li anode and simultaneously triggers a solution-based pathway of the discharge product.In this work,hexam-ethyldisilazane (HMDS) is introduced into the electrolyte of an aprotic Li-O2 battery.HMDS has a strong ability to combine with a trace of water to generate a hydrophobic hexamethyldisiloxane (MM),which eliminates water from the electrolyte decomposition and then prevents the Li anode from producing the insulating LiOH with water.In this case,the hydrophobic MM disperses in the ether-based electrolyte,forming a dispersion hydrophobic electrolyte.This electrolyte can anchor water from the environment on the cathode side,which triggers a solution-based pathway and regulates the growth morphology of the discharge product and consequently increases the discharge capacity.Compared with the Li-O2 battery without the HMDS,the HMDS-containing Li-O2 battery contributes an about 13-fold increase of cyclabil-ity (400 cycles,1800 h) in the extreme environment of saturated water vapor.This work opens a new approach for directly operating aprotic Li-O2 batteries in ambient air.

Yinan Zhang;Fangling Jiang;Hao Jiang;Osamu Yamamoto;Tao Zhang

State Key Lab of High Performance Ceramics and Superfine Microstructure,Shanghai Institute of Ceramics,Chinese Academy of Sciences,Shanghai 200050,China;Center of Materials Science and Optoelectronics Engineering,University of Chinese Academy of Sciences,Beijing 100049,China;Key Laboratory for Ultrafine Materials of Ministry Education,School of Materials Science and Engineering,East China University Science and Technology,Shanghai 200237,China;Department of Chemistry,Faculty of Engineering,Mie University,Tsu 514-8507,Japan

能源化学

[1]Yinan Zhang;Fangling Jiang;Hao Jiang;Osamu Yamamoto;Tao Zhang-.Dispersion hydrophobic electrolyte enables lithium-oxygen battery enduring saturated water vapor)[J].能源化学,2022(01):511-519

hexam,ethyldisilazane,hexamethyldisiloxane,cyclabil

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