Effects of nanopores and sulfur doping on hierarchically bunched carbon fibers to protect lithium metal anode

作     者：Ji In Jung Sunwoo Park Son Ha Se Youn Cho Hyoung-Joon Jin Young Soo Yun 

作者机构：Program in Environmental and Polymer EngineeringInha UniversityIncheonSouth Korea KU-KIST Graduate School of Converging Science and TechnologyKorea UniversitySeoulSouth Korea Carbon Composite Materials Research CenterKorea Institute of Science and TechnologyWanju-gunJeollabuk-doSouth Korea Department of Polymer Science and EngineeringInha UniversityIncheonSouth Korea Department of Integrative Energy EngineeringKorea UniversitySeoulSouth Korea 

出 版 物：《Carbon Energy》 (碳能源（英文）)

年 卷 期：2021年第3卷第5期

页      面：784-794页

核心收录：

学科分类：0830[工学-环境科学与工程（可授工学、理学、农学学位）] 0808[工学-电气工程] 08[工学] 0807[工学-动力工程及工程热物理] 0805[工学-材料科学与工程（可授工学、理学学位）] 0703[理学-化学] 0702[理学-物理学] 

基　　金：National Research Foundation of Korea Grant/Award Numbers:2019R1A2C1084836 2021R1A4A2001403。 

主　　题：carbon template Li-S batteries lithium metal anode lithium metal batteries nanoporous carbon sulfur doping 

摘      要：Studies on three-dimensional structured carbon templates have focused on how to guide homogeneous lithium metal nucleation and growth for lithium metal anodes(LMAs).However,there is still insufficient evidence for a key factor to achieve their high electrochemical performance.Here,the effects of nanopores and sulfur doping on carbon-based nanoporous host(CNH)electrode materials for LMAs were investigated using natural polymer-derived CNHs.Homogeneous pore-filling behaviors of lithium metal in the nanopores of the CNH electrode materials were first observed by ex situ scanning electron microscopy analysis,where the protective lithium metal nucleation and growth process led to significantly high Coulombic efficiency(CE)of~99.4%and stable 600 cycles.In addition,a comparison study of CNH and sulfurdoped CNH(S-CNH)electrodes,which differ only in the presence or absence of sulfur,revealed that sulfur doping can cause lower electrochemical series resistance,higher CE value,and better cycling stability in a wide range of current densities and number of cycles.Moreover,S-CNH-based LMAs showed high electrochemical performance in full-cell Li-S battery tests using a sulfur copolymer cathode,where a high energy density of 1370Wh kgelectrode−1 and an excellent power density of 4120Wkgelectrode−1 were obtained.