Journal of Materials Science, Vol.56, No.1, 664-676, 2021
Controlled synthesis of alpha-Fe2O3@rGO core-shell nanocomposites as anode for lithium ion batteries
The fine shape control of metal oxides nanocrystal and component are the key for the preparation of high-performance metal oxides/graphene nanocomposites. Herein, a simpler and practicable in situ one-pot approach was used to synthetize alpha-Fe2O3@reduced graphene oxide (rGO) core-shell nanocomposites. By controlling the amount of hydrazine hydrate and GO in reaction system, the shape of alpha-Fe(2)O(3)nanocrystals can be tailored from spindle gradually to ellipsoid and quasi-sphere, and the thickness of enwrapped rGO can also be finely controlled. The as-prepared alpha-Fe2O3@rGO core-shell composites showed much better lithium storage performance than bare alpha-Fe(2)O(3)nanocrystals. Owing to the core-shell structure and the high conductivity and stability of rGO nanosheet, the quasi-sphere-alpha-Fe2O3@rGO composites delivered a high reversible specific capacity up to 971 mAh g(-1)at the current density of 0.2 A g(-1), retaining 530 mA h g(-1)at 2 A g(-1)and 361 mA h g(-1)at 5 A g(-1)after 800 cycles with only 0.05% decay per-cycle. Moreover, the facile approach can provide a new strategy for the fabrication of other shape-size dependent, functional, and multicomponent graphene-based composites.