Realizing interfacial coupled electron/ion transport through reducing the interfacial oxygen density of carbon skeletons for high-performance lithium metal anodes  

作　　者：Yao-Lu Ye Yan Zhou Huan Ye Fei-Fei Cao 

机构地区：[1]College of Chemistry,Huazhong Agricultural University,Wuhan 430070,Hubei,China [2]Institute of Applied Mycology,College of Plant Science and Technology,Huazhong Agricultural University,Wuhan 430070,Hubei,China

出　　处：《Journal of Energy Chemistry》2025年第2期744-750,I0016,共8页能源化学(英文版)

基　　金：supported by the National Natural Science Foundation of China(21975091,22122902,and 52272208);the Fundamental Research Fund for the Central Universities of China(2662023LXPY001 and 2662021JC004).

摘　　要：Lithium plating/stripping occurs at the a node/electrolyte interface which involves the flow of electrons from the current collector and the migration of lithium ions from the solid-electrolyte interphase(SEI).The dual continuous rapid transport of interfacial electron/ion is required for homogeneous Li deposition.Herein,we propose a strategy to improve the Li metal anode performance by rationally regulating the interfacial electron density and Li ion transport through the SEI film.This key technique involves decreasing the interfacial oxygen density of biomass-derived carbon host by regulating the arrangement of the celluloses precursor fibrils.The higher specific surface area and lower interfacial oxygen density decrease the local current density and ensure the formation of thin and even SEI film,which stabilized Li^(+)transfer through the Li/electrolyte interface.Moreover,the improved graphitization and the interconnected conducting network enhance the surface electronegativity of carbon and enable uninterruptible electron conduction.The result is continuous and rapid coupled interfacial electron/ion transport at the anode/electrolyte reaction interface,which facilitates uniform Li deposition and improves Li anode performance.The Li/C anode shows a high initial Coulombic efficiency of 98%and a long-term lifespan of over 150cycles at a practical low N/P(negative-to-positive)ratio of 1.44 in full cells.

关 键 词：Lithium metal batteries Lithium-lean metal anodes CELLULOSE Electron/ion conducting Interfacial oxygen density 

分 类 号：TM9[电气工程—电力电子与电力传动]