Regulating the intrinsic electronic structure of carbon nanofibers with high-spin state Ni for sodium storage with high-power density
Publication Name
Journal of Materials Science and Technology
Abstract
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 nanoparticles 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 demonstrates 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 results 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.
Open Access Status
This publication is not available as open access
Volume
171
First Page
16
Last Page
23
Funding Number
52102291
Funding Sponsor
National Natural Science Foundation of China