Facile fabrication of Fe3O4 nanoparticle/carbon nanofiber aerogel from Fe-ion cross-linked cellulose nanofibrils as anode for lithium-ion battery with superhigh capacity

摘要

Recently, Fe3O4/carbon (Fe3O4/C) composites have been widely studied as anode materials for lithiumion batteries (LIBs) to improve the electrochemical performance of Fe3O4. However, electrochemical performances of these composites are still restricted because of the low theoretical specific capacity (372 mA h g(-1)) of graphite materials. Herein, we have described a simple method for preparing Fe3O4/carbon nanofiber aerogel (Fe3O4/CNFA) via crosslinking 2,2,6,6-tetramethylpiperidinyl-1-oxyl (TEMPO)oxidized cellulose nanofibrils (TOCN-Na) by Fe3+ followed by pyrolysis. Special 3-Dimension (3D) netlike Fe3O4/CNFA was successfully fabricated with hierarchical porosity and Fe3O4 nanoparticles loaded on the carbon nanofibers, which dramatically improved the transportation and storage of lithiumion, as well as restrained the agglomeration and severe volume expansion of Fe3O4 during lithium insertion. Thus, the composite delivered an extraordinarily high reversible capacity of 1635 mA h g(-1) over 100 cycles at 1 A g(-1) and a great rate performance of 1025 mA h g(-1) at 4 A g(-1). (C) 2020 Elsevier B.V. All rights reserved.