Dispersion hydrophobic electrolyte enables lithium-oxygen battery enduring saturated water vapor

• 作者: Yinan Zhang Fangling Jiang Hao Jiang Osamu Yamamoto Tao Zhang
• 来源期刊: 能源化学
• 年，卷（期）: 2022,（1）
• 页码范围: 511-519
• 页数: 9页
• 语种: 英文

摘要

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.