Novel 3D Co9S8@graphene nanocomposites prepared by deep eutectic solvents for lithium-ion storage

Three-Dimensional Graphene-Wrapped CoSe2 Nanowires for High-Performance Asymmetric Supercapacitors

“…This can be attributed to the graphene composite’s three-dimensional architecture, which effectively mitigates the volume expansion problem of CoSe 2 during long-term cycling . Additionally, the introduction of 3DG to CoSe 2 NWs enhances the electrode’s specific surface area, leading to more active sites for redox reactions while effectively suppressing the selenide agglomeration during cycling, thus improving the specific capacitance. − To further understand the enhancement effect of 3DG on the electrode structure and performance, a study was carried out by changing the ratio of 3DG to NWs in the 3DG/CoSe 2 NWs composite. Figure e illustrates the GCD curves of 3DG/CoSe 2 NWs with different ratios, while the corresponding specific capacities are computed and presented in Figure f.…”

Co9S8/Biocarbon Tubular Nanocomposite with Low-Temperature Performance for Lithium Storage

“…14−18 For example, Li et al 14 prepared a NC/ Co 9 S 8 /graphene nanocomposite, which showed high capacity of 853 mA h g −1 at 1 A g −1 after 500 cycles. Xu et al 16 prepared a Co 9 S 8 /graphene nanocomposite that exhibited good discharge capacity of 550 mA h g −1 at 1 A g −1 after 1000 cycles. Wang et al 18 reported a Co 9 S 8 /CNTs nanocomposite that had good cycling stability after 500 cycles at 1.0 A g −1 .…”

“…At present, one effective strategy is the introduction of a carbon matrix (e.g., graphene, carbon nanotube (CNT), and other artificial carbons) to form corresponding Co 9 S 8 -based nanocomposites. − For example, Li et al prepared a NC/Co 9 S 8 /graphene nanocomposite, which showed high capacity of 853 mA h g –1 at 1 A g –1 after 500 cycles. Xu et al prepared a Co 9 S 8 /graphene nanocomposite that exhibited good discharge capacity of 550 mA h g –1 at 1 A g –1 after 1000 cycles. Wang et al reported a Co 9 S 8 /CNTs nanocomposite that had good cycling stability after 500 cycles at 1.0 A g –1 .…”

Biomass-Derived Graphitic Carbon/Co9S8 Nanocomposite as Anode for Enhanced Lithium Storage

“…Qiu et al synthesized the Co 9 S 8 @CF composite through an electrospinning strategy, which showed a capacity of 406 mA h g –1 after 750 cycles at 1 A g –1 . Xu et al assembled a flower-like Co 9 S 8 @graphene composite by an in situ pyrolysis method, and its capacity was maintained at 550 mA h g –1 after 1000 cycles at 1 A g –1 . Wu et al prepared the Co 9 S 8 @NC anode material by hydrothermal reaction using dopamine as a carbon source, which retained 727 mA h g –1 after 2000 long cycles at low 0.5 A g –1 .…”

“…The above results indicate that the rational design of mesoporous carbon-doped Co 9 S 8 -based heterostructures can effectively improve the long-cycle performance during the charge and discharge processes. The reason can be attributed to the fact that the introduction of carbon material not only increases the conductivity, specific surface area, and additional lithium storage sites of Co 9 S 8 -based heterostructure material but also facilitates the formation of a stable solid electrolyte interphase (SEI) film and mitigates the volume expansion of Co 9 S 8 nanoparticles, thereby enhancing its structural stability and long-term cycle performance. , However, there are few reports on carbon-doped Co 9 S 8 -based anode materials with more than 1000 long cycles to date . Meanwhile, the synthetic conditions of artificial carbon materials (e.g., CNTs, graphene) are relatively harsh and complicated, involving the utilization of various chemical reagents.…”