Synthesis of Sodium Cobalt Fluoride/Reduced Graphene Oxide (NaCoF3/rGO) Nanocomposites and Investigation of Their Electrochemical Properties as Cathodes for Li-Ion Batteries

Abstract

In this study, sodium cobalt fluoride (NaCoF3)/reduced graphene oxide (NCF/rGO) nanocomposites were fabricated through a simple one-pot solvothermal process and their electrochemical performance as cathodes for Li-ion batteries (LIBs) was investigated. The NCF nanoclusters (NCs) on the composites (300–500 nm in size) were formed by the assembly of primary nanoparticles (~20 nm), which were then incorporated on the surface of rGO. This morphology provided NCF NCs with a large surface area for efficient ion diffusion and also allowed for close contact with the conductive matrix to promote rapid electron transfer. As a cathode for LIBs, the NCF/rGO electrode achieved a high reversible capacity of 465 mAh·g−1 at 20 mA·g−1 via the conversion reaction, and this enhancement represented more than five times the reversible capacity of the bare NCF electrode. Additionally, the NCF/rGO electrode exhibited both better specific capacity and cyclability within the current density testing range (from 20 to 200 mA·g−1), compared with those of the bare NCF electrode.

Graphene-Based Two-Dimensional Mesoporous Materials: Synthesis and Electrochemical Energy Storage Applications

“…Similarly, TiO 2 @SnO 2 @G was synthesized by sequential growth of SnO 2 and TiO 2 NPs in acidic aqueous dispersion of GO [ 88 ]. MO/G has also been synthesized by in situ hydrothermal growth of MO NPs on GO and subsequent reduction/calcination [ 122 , 123 ]. Rooney and coworkers combined hydrothermal treatment with a water-in-oil emulsion system [ 93 ] to synthesize TiO 2 QDs (6–8 nm)/G nanosheets.…”

Facile Preparation of Magnetite-Incorporated Polyacrylonitrile-Derived Carbons for Li-Ion Battery Anodes

“…Iron oxides have attracted attention as viable candidates for the construction of anode materials as they can achieve high capacities through conversion reactions. , For example, the theoretical capacities of Fe 3 O 4 and Fe 2 O 3 are 924 and 1007 mAh/g, respectively, which are more than 2.5 times higher than those of graphite-based materials. − However, owing to the nature of the conversion reaction, iron oxides exhibit certain disadvantages, such as low charge–discharge reversibility and large volume changes during operation. ,, These disadvantages can be overcome using a composite material comprising iron oxides and carbon materials. − Iron oxides can improve the capacity, while the carbon materials can aid in overcoming the disadvantages of iron oxides. In addition, iron components can facilitate the graphitization of carbon during the carbonization of raw materials. − Enhancing the electrical conductivity of carbon materials through further graphitization at relatively low temperatures can increase the rate capabilities.…”