Fe₃O₄ Hollow Nanosphere-Coated Spherical-Graphite Composites: A High-Rate Capacity and Ultra-Long Cycle Life Anode Material for Lithium Ion Batteries.

ABSTRACT: The spherical-graphite/Fe₃O₄ composite has been successfully fabricated by a simple two-step synthesis strategy. The oxygenous functional groups between spherical-graphite and Fe₃O₄ benefit the loading of hollow Fe₃O₄ nanospheres. All of the composites as anodes for half cells show higher lithium storage capacities and better rate performances in comparison with spherical-graphite. The composite containing 39 wt% of hollow Fe₃O₄ nanospheres exhibits a high reversible capacity of 806 mAh g^-1 up to 200 cycles at 0.5 A g^-1. When cycled at a higher current density of 2 A g^-1, a high charge capacity of 510 mAh g^-1 can be sustained, even after 1000 long cycles. Meanwhile, its electrochemical performance for full cells was investigated. When matching with LiCoO₂ cathode, its specific capacity can remain at 137 mAh g^-1 after 100 cycles. The outstanding lithium storage performance of the spherical-graphite/Fe₃O₄ composite may depend on the surface modification of high capacity hollow Fe₃O₄ nanospheres. This work indicates that the spherical-graphite/Fe₃O₄ composite is one kind of prospective anode material in future energy storage fields.

SUBMITTER: Jiang F 

PROVIDER: S-EPMC6669536 | biostudies-literature | 2019 Jul

REPOSITORIES: biostudies-literature