Self-supporting,low-tortuosity hard carbon for superior sodium-ion batteries  

作　　者：Lai-Qiang Xu Bing Feng Yu Su Qian Hu Gong-Gang Liu Yuan-Juan Bai Shan-Shan Chang Xiao-Dong Wang Denis Rodrigue Jin-Bo Hu Xiao-Bo Ji Yi-Qiang Wu 

机构地区：[1]College of Materials Science and Engineering,Central South University of Forestry and Technology,Changsha,410004,China [2]Department of Wood and Forest Sciences,Laval University,Quebec,G1V 0A6,Canada [3]Department of Chemical Engineering,Laval University,Quebec,G1V 0A6,Canada [4]College of Chemistry and Chemical Engineering,Central South University,Changsha,410083,China

出　　处：《Rare Metals》2024年第12期6362-6372,共11页稀有金属(英文版)

基　　金：financially supported by the National Natural Science Foundation of China(Nos.32171709 and 32271791);China Postdoctoral Science Foundation(No.2023M743972)。

摘　　要：Hard carbon stands out as the most promising candidate for anodes in sodium-ion battery.Nevertheless,addressing the challenges of low initial Coulombic efficiency and rate performance is crucial for practical applications.In this study,we employed a dimensionally designed approach,using six different biomass precursors,to preserve their inherent fine hierarchical morphological structures and appearances during the synthesis of selfsupporting carbon materials.Benefiting from its low-tortuosity structure that facilitates electron and ion transport,as well as its surface-enriched C=O functional groups and significant closed micropore areas,the obtained carbon material exhibits excellent electrochemical performance in sodium-ion storage,demonstrated by finite element simulation.Notably,the carbonized basswood exhibited a remarkable initial Coulombic efficiency of up to 92.4%and demonstrated outstanding rate performance,achieving a capacity of 223.3 mAh·g^(-1)at a high current density of2 A·g^(-1).In addition,thorough investigation was conducted on the influence of microstructure on the sodium storage behavior of hard carbon.Ex situ X-ray diffraction(XRD)was used to confirm that the capacity in the plateau region originates from interlayer insertion and closed-pore filling,which is consistent with the results obtained from smallangle X-ray scattering.These findings underscore the immense potential of leveraging surface functionalization and structural design to bolster the performance of hard carbon,paving the way for promising future advancements in this field.

关 键 词：Sodium-ion battery Hard carbon BIOMASS SELF-SUPPORTING Coulombic efficiency 

分 类 号：TM9[电气工程—电力电子与电力传动]