Regulating the intrinsic electronic structure of carbon nanofibers with high-spin state Ni for sodium storage with high-power density  

作　　者：Zhijia Zhang Gang Xie Yuefang Chen Yanhao Wei Mengmeng Zhang Shulei Chou Yunxiao Wang Yifang Zhang Yong Jiang 

机构地区：[1]School of Materials Science and Engineering,Institute of Quantum Materials and Devices,State Key Laboratory of Separation Membrane and Membrane Processes,Tiangong University,Tianjin 300387,China [2]Institute for Carbon Neutralization,College of Chemistry and Materials Engineering,Wenzhou University,Wenzhou 325035,China [3]Institute for Superconducting and Electronic Materials,University of Wollongong,Wollongong,NSW 2522,Australia

出　　处：《Journal of Materials Science & Technology》2024年第4期16-23,共8页材料科学技术（英文版）

基　　金：supported by the National Natural Science Foundation of China(Nos.52271011,52102291).

摘　　要：Carbon nanofibers(CNFs)with high specific surface area show great potential for sodium storage as a hard carbon material.Herein,CNFs anchored with Ni nanoparticles(CNFs/Ni)were prepared through chemical vapor deposition and impregnation reduction methods,in situ growing on the three-dimensional porous copper current collector(3DP-Cu).The coupling effect of high-spin state Ni nanopar-ticles leads to the increase of defect density and the expansion of lattice spacing of CNFs.Meanwhile,the 3DP-Cu ensures a high loading capacity of CNFs and short ion/electron transport channels.As an integral binder-free anode,the 3DP-Cu/CNFs/Ni exhibits excellent electrochemical performance,which demon-strates a high specific capacity with 298.5 mAh g^(-1)at 1000 mA g^(-1)after 1500 cycles,and a high power density with 200 mAh g^(-1)over 1000 cycles at 5000 mA g^(-1).Density functional theory calculation re-sults show that the high-spin state Ni regulates the electronic structure of CNFs,which significantly reduces the adsorption energy for Na^(+)(-2.7 Ev)and thus enables high-rate capability.The regulation of the electronic structure of carbon materials by high-spin state metal provides a new strategy for developing high-power carbonaceous anode materials for sodium-ion batteries.

关 键 词：Carbon nanofibers Ni nanoparticles High-spin state Sodium-ion batteries Anode materials Density functional theory calculation 

分 类 号：TB383.1[一般工业技术—材料科学与工程] TM912[电气工程—电力电子与电力传动]