Authors
Ahmadiparidari, Alireza; Rastegar, Sina; Singh, Sachin; Zhang, Chengji; Hemmat, Zahra ; Bagheri, Maryam; Dandu, Naveen; Counihan, Michael; Rojas, Tomas; Majidi, Leily; Wang, Shuxi; Jaradat, Ahmad; Assary, Rajeev; Redfern, Paul; Tepavcevic, Sanja; Ngo, Anh; Curtiss, Larry
Abstract
The rechargeable lithium-oxygen (Li-O2) battery has the highest theoretical specific energy density of any rechargeable batteries and could transform energy storage systems if a practical device could be attained. However, among numerous challenges, which are all interconnected, are polarization due to sluggish kinetics, low cycle life, small capacity, and slow rates. In this study, we report on use of KMnO4 to generate a colloidal electrolyte made up of MnO2 nanoparticles. The resulting electrolyte provides a redox mediator for reducing the charge potential and lithium anode protection to increase cycle life. This electrolyte in combination with a stable binary transition metal dichalcogenide alloy, Nb0.5Ta0.5S2, as the cathode enables the operation of a Li-O2 battery at a current density of 1 mA center dot cm-2 and specific capacity ranging from 1000 to 10000 mA center dot h center dot g-1 (corresponding to 0.1-1 mA center dot h center dot cm-2) in a dry air environment with a cycle life of up to 150. This colloidal electrolyte provides a robust approach for advancing Li-air batteries.