@article{Wu2023, 
author = {Xinbin Wu and Huiping Wu and Shundong Guan and Ying Liang and Kaihua Wen and Huanchun Wang and Xuanjun Wang and Ce-Wen Nan and Liangliang Li},
title = {A molecular sieve-containing protective separator to suppress the shuttle effect of redox mediators in lithium-oxygen batteries},
year = {2023},
journal = {Nano Research},
volume = {16},
number = {7},
pages = {9453-9460},
keywords = {lithium-oxygen batteries, zeolite, shuttle effects, protective separators, molecular sieves, redox mediators},
url = {https://www.sciopen.com/article/10.1007/s12274-023-5663-5},
doi = {10.1007/s12274-023-5663-5},
abstract = {Lithium-oxygen (Li-O2) batteries have a great potential in energy storage and conversion due to their ultra-high theoretical specific energy, but their applications are hindered by sluggish redox reaction kinetics in the charge/discharge processes. Redox mediators (RMs), as soluble catalysts, are widely used to facilitate the electrochemical processes in the Li-O2 batteries. A drawback of RMs is the shuttle effect due to their solubility and mobility, which leads to the corrosion of a Li metal anode and the degradation of the electrochemical performance of the batteries. Herein, we synthesize a polymer-based composite protective separator containing molecular sieves. The nanopores with a diameter of 4 Å in the zeolite powder (4A zeolite) are able to physically block the migration of 2,2,6,6-tetramethylpiperidinyloxy (TEMPO) molecules with a larger size; therefore, the shuttle effect of TEMPO is restrained. With the assistance of the zeolite molecular sieves, the cycle life of the Li-O2 batteries is significantly extended from ~ 20 to 170 cycles at a current density of 250 mA·g−1 and a limited capacity of 500 mAh·g−1. Our work provides a highly effective approach to suppress the shuttle effects of RMs and boost the electrochemical performance of Li-O2 batteries.}
}