C10H4O2S2/graphene composite as a cathode material for sodium-ion batteries

摘要: Organic electroactive materials are promising candidates for next generation sodium ion batteries (SIBs) due to their low cost, sustainability and environmental benignity. It is of great interest develop organic compounds with multifunctional groups be used as electrode SIBs owing light weight, multi-electron reactions, redox stability structural diversity. The compound 4,8-dihydrobenzo[1,2-b:4,5-b′] dithiophene-4,8-dione (BDT) was prepared by a facile solution method, its graphene composite (BDT–G) synthesized simple dispersion–deposition process. BDT–G cathode material demonstrated much enhanced electrochemical performance, including higher reversible capacity (217 mA h g−1vs. 145 g−1), better cycling performance (∼175 ∼100 g−1 after 70 cycles at 0.2C), rate capabilities (1.7 times than BDT 2C) compared BDT. revealed that these improved properties should mainly attributed the excellent electronic conductivity ionic transport efficiency promoted graphene. Furthermore, fast reaction help unlimited electron via two-dimensional network results in usage materials, could inhibited from dissolution electrolyte.