Cattle! USTC quantitatively reveals the mass-electrical coupling mechanism of lithium-oxygen batteries
Tan Peng, a distinguished professor in the Department of Thermal Science and Energy Engineering, School of Engineering Science, University of Science and Technology of China, published a research work in the internationally renowned academic journal Advanced Energy Materials, aiming to improve the scientific understanding of the electrochemical and mass transfer coupling mechanism accompanied by microstructural changes in porous electrodes of Li-O2 batteries, and provide guidance for the design of a new generation of electrodes. The results show that there is a working mechanism for dividing lithium-oxygen batteries near aperture R1 and R2 (R2>R1), and oxygen transport is the main controlling factor of electrochemical performance, and when the channel unit diameter D is lower than R1, oxygen transport limits the low discharge capacity. For microporous and macroporous electrodes, increasing the solubility and diffusion rate of oxygen in the electrolyte and reducing the deposition rate of Li2O2 film are effective ways to enhance the electrochemical performance.
