首页|Regulating the intrinsic electronic structure of carbon nanofibers with high-spin state Ni for sodium storage with high-power density
Regulating the intrinsic electronic structure of carbon nanofibers with high-spin state Ni for sodium storage with high-power density
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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 re-duces 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.
Carbon nanofibersNi nanoparticlesHigh-spin stateSodium-ion batteriesAnode materialsDensity functional theory calculation
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
Institute for Carbon Neutralization,College of Chemistry and Materials Engineering,Wenzhou University,Wenzhou 325035,China
Institute for Superconducting and Electronic Materials,University of Wollongong,Wollongong,NSW 2522,Australia
National Natural Science Foundation of ChinaNational Natural Science Foundation of China
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