Lithium-oxygen(Li-O_(2))batteries have attracted considerable attention due to their high theoretical energy density.However nonrenewable and high-cost electrode materials have limited their progress.Herein,the author...Lithium-oxygen(Li-O_(2))batteries have attracted considerable attention due to their high theoretical energy density.However nonrenewable and high-cost electrode materials have limited their progress.Herein,the authors design and fabricate a three-dimensional freestanding bi-biomass egg-sugarcane(Egg-SC)electrode with excellent structure and performance as the cathode for Li-O_(2) batteries.The open,interconnected microchannels derived from the natural SC can provide sufficient pathways for O_(2) gas diffusion.The heteroatom-doped hollow carbon spheres(HD-HCS)obtained via biomass egg supply many of the triphase active sites for the formation and decomposition of the discharge products of Li2O_(2).Benefiting from the unique nature and structure of the cathode,Li-O_(2) batteries show high-rate capacity of 8.07 mAh cm^(-2) and superior cycle stability of 294 cycles at a current density of 0.1 mA cm^(-2).The excellent performance and structure of the bi-biomass cathode possess great application potential in nature-inspired materials design for the cathodes of Li-O_(2) batteries.展开更多
基金This study was financially supported by the National Natural Science Foundation of China(grant nos.51771177,51972141,21835002,and 21621001)the 111 Project(no.B17020)+4 种基金the Department of Education of Jilin Province(no.JJKH20190113KJ)the Jilin Province Science and Technology Development Program(grant no.20190303104SF)the Jilin Province/Jilin University Co-construction Project for New Materials(no.SXGJSF2017-3)the Science and Technology Breakthrough Plan of Henan Province(no.202102210242)the Youth Innovation Fund project of Zhengzhou Institute of Technology(no.QNCXJJ2019K2).
文摘Lithium-oxygen(Li-O_(2))batteries have attracted considerable attention due to their high theoretical energy density.However nonrenewable and high-cost electrode materials have limited their progress.Herein,the authors design and fabricate a three-dimensional freestanding bi-biomass egg-sugarcane(Egg-SC)electrode with excellent structure and performance as the cathode for Li-O_(2) batteries.The open,interconnected microchannels derived from the natural SC can provide sufficient pathways for O_(2) gas diffusion.The heteroatom-doped hollow carbon spheres(HD-HCS)obtained via biomass egg supply many of the triphase active sites for the formation and decomposition of the discharge products of Li2O_(2).Benefiting from the unique nature and structure of the cathode,Li-O_(2) batteries show high-rate capacity of 8.07 mAh cm^(-2) and superior cycle stability of 294 cycles at a current density of 0.1 mA cm^(-2).The excellent performance and structure of the bi-biomass cathode possess great application potential in nature-inspired materials design for the cathodes of Li-O_(2) batteries.
