Characteristics and Electrochemical Performance of Hydroxyl-Functionalized Graphene Quantum Dot-Coated Si Nanoparticles/Reduced Graphene Hybrid Anodes for Advanced Li-Ion Batteries

Table 2

Electrochemical performance of the fabricated composites.

Sample	Low-current density performance (at 0.1 A g^−1)									High-current density performance
	Discharge capacity (mAh g^−1)				Capacity retention (%)		Coulombic efficiency (%)			Discharge capacity (mAh g^−1)
	1st cycle	2nd cycle	50th cycle	100th cycle	At 50th cycle	At 100th cycle	1st cycle	2nd cycle	50th cycle	At 1 A g^−1	At 2 A g^−1	At 5 A g^−1
0.2OH-GQD@Si/0.2rGO-1	1,785.35	1,298.26	1,047.19	824.37	99.68	99.49	69.97	96.10	97.90	984.25	966.89	948.19
0.3OH-GQD@Si/0.1rGO-2	2,229.16	1,613.67	1,303.21	1,090.13	99.72	99.59	70.70	97.45	99.77	1,524.25	1,499.28	1,473.28