Affiliation:
1. Key Lab for Special Functional Materials of Ministry of Education National & Local Joint Engineering Research Center for High‐efficiency Display and Lighting Technology School of Materials Science and Engineering Collaborative Innovation Center of Nano Functional Materials and Applications Henan University Kaifeng 475004 P. R. China
2. College of Chemistry and Chemical Engineering Henan Key Laboratory of Function‐Oriented Porous Materials Luoyang Normal University Luoyang 471934 P. R. China
3. State Key Laboratory of Rare Earth Resource Utilization Changchun Institute of Applied Chemistry Chinese Academy of Sciences Changchun 130022 P. R. China
4. Department of Chemistry College of Science Northeastern University Shenyang Liaoning 110819 P. R. China
Abstract
AbstractAprotic lithium‐oxygen (Li–O2) batteries hardly cycle at the condition of high area capacity for realizing their high energy density, because the unconducive lithium peroxide (Li2O2) discharge product limits the electron transfer between electrode and O2/Li2O2. Here, it is demonstrated that one of redox mediator (RM), triethylene glycol bis‐2,2,6,6‐tetramethylpiperidin‐1‐oxyl radical (D‐TEMPO), can be effectively used to promote the electron transfer between electrode and Li2O2, which the shuttle effect of RM can be cooperatively inhibited by regulating the size of RM and the thickness of ion‐selective membrane. As a result, the Li–O2 battery coupled with double cathodes, D‐TEMPO, and ion‐selective membrane can be stably operated for 46 days at a capacity of 5 mAh cm−2. The concept in this work provides the cooperative design of a stable solution‐mediated pathway for high‐capacity Li–O2 battery with long cycle stability.
Funder
National Natural Science Foundation of China
Subject
General Materials Science,Renewable Energy, Sustainability and the Environment