ScholarWorks@성균관대학교

초록

Sodium-ion batteries (SIBs) have the potential to be a cost-effective and sustainable solution for large-scale energy storage systems (ESSs) due to the abundance of sodium reserves. Na2Ti6O13 has been considered as a suitable candidate for use as an anode material in SIBs owing to its environmental friendliness, low cost, and excellent cycling stability. Despite its advantages, Na2Ti6O13 has intrinsic limitations such as electrical conductivity. To overcome these obstacles, a sandwich-structured Na2Ti6O13/reduced graphene oxide (rGO) composite is synthesized through a liquid-phase exfoliation and restacking method using electrostatic interactions. The Na2Ti6O13/rGO composite showed remarkable improvement in both reversible discharge capacity and cycle stability. In comparison to bare Na2Ti6O13 with a discharge capacity of 20.1 mAh g-1 after 500 cycles, the Na2Ti6O13/rGO1 composite displayed a discharge capacity of 196.5 mAh g-1 at a current density of 0.1 A g-1 and a voltage range of 0.01-2.5 V. Furthermore, the Na2Ti6O13/rGO1||Na3V2(PO4)3 full cell are assembled, discharging an energy density of 251.3 Wh kg-1anode with a power density of 228.1 W kg-1anode after 100 cycles in a voltage range of 1.0-4.0 V.

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