Affiliation:
1. State Key Laboratory of Inorganic Synthesis and Preparative Chemistry College of Chemistry Jilin University Changchun 130012 P. R. China
2. International Center of Future Science Jilin University Changchun 130012 P. R. China
3. College of Chemical and Food Zhengzhou University of Technology Zhengzhou 450044 P. R. China
Abstract
AbstractRechargeable lithium−oxygen (Li−O2) batteries with high theoretical energy density are considered as promising candidates for portable electronic devices and electric vehicles, whereas their commercial application is hindered due to poor cyclic stability caused by the sluggish kinetics and cathode passivation. Herein, the intrinsic stress originated from the growth and decomposition of the discharge product (lithium peroxide, Li2O2) is employed as a microscopic pressure resource to induce the built‐in electric field, further improving the reaction kinetics and interfacial Lithium ion (Li+) transport during cycling. Piezopotential caused by the intrinsic stress‐strain of solid Li2O2 is capable of providing the driving force for the separation and transport of carriers, enhancing the Li+ transfer, and thus improving the redox reaction kinetics of Li−O2 batteries. Combined with a variety of in situ characterizations, the catalytic mechanism of barium titanate (BTO), a typical piezoelectric material, was systematically investigated, and the effect of stress‐strain transformation on the electrochemical reaction kinetics and Li+ interface transport for the Li−O2 batteries is clearly established. The findings provide deep insight into the surface coupling strategy between intrinsic stress and electric fields to regulate the electrochemical reaction kinetics behavior and enhance the interfacial Li+ transport for battery system.
Funder
National Natural Science Foundation of China