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

作　　者：Yinan Zhang Fangling Jiang Hao Jiang Osamu Yamamoto Tao Zhang 

机构地区：[1]State Key Lab of High Performance Ceramics and Superfine Microstructure,Shanghai Institute of Ceramics,Chinese Academy of Sciences,Shanghai 200050,China [2]Center of Materials Science and Optoelectronics Engineering,University of Chinese Academy of Sciences,Beijing 100049.China [3]Key Laboratory for Ultrafine Materials of Ministry Education,School of Materials Science and Engineering,East China University Science and Technology,Shanghai 200237,China [4]Department of Chemistry,Faculty of Engineering,Mie University,Tsu 514-8507,Japan

出　　处：《Journal of Energy Chemistry》2022年第1期511-519,I0014,共10页能源化学（英文版）

基　　金：supported by the National Natural Science Foundation of China(21875278);Science and Technology Commission of Shanghai Municipality(20511107800).

摘　　要：Li-O_(2) batteries gain widespread attention as a can didate for next-generati on energy storage devices due to their extraordinary theoretic specific energy.The semi-open structure of Li-O_(2) 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,hexamethyldisilazane(HMDS)is introduced into the electrolyte of an aprotic Li-O_(2) battery.HMDS has a strong ability to combine with a trace of water to gen erate a hydrophobic hexamethyldisiloxa ne(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-O_(2) battery without the HMDS,the HMDS-containing Li-O_(2) battery contributes an about 13-fold increase of cyclability(400 cycles,1800 h)in the extreme environment of saturated water vapor.This work opens a new approach for directly operating aprotic Li-O_(2) batteries in ambient air.

关 键 词：HEXAMETHYLDISILAZANE Dispersion hydrophobic electrolyte Saturated water vapor pressure Li-O2 battery Long life 

分 类 号：TM911.41[电气工程—电力电子与电力传动]