▎ 摘　　要

Sodium ion batteries (SIBs) are promising alternative for lithium ion batteries (LIBs) due to the abundant reserve of Na compared to Li. Although the three-dimensional (3D) thick electrodes for LIBs have been widely studied, corresponding researches are seldom reported for SIBs anode. Herein, a high theoretical capacity binary metal sulfide (FeSb2S4) on reduced oxide graphene (rGO) was used as active component to prepare the light-weight, current collector-free, 3D thick anode (FeSb2S4/CNTs/rGO/GO) for SIBs. The as prepared 3D discs can keep its integral structure under the pressure from the battery assembly, as the interconnected macropores are formed during the freeze-drying process. The macropores can also act as the electrolyte channel to facilitate the mass transfer, thus enabling the low Na+ diffusion resistance when the thickness of the electrodes increased from 150 mu m to 540 mu m. Based on the capacity calculation of the active components (FeSb2S4/rGO), the as-prepared 3D discs with a thickness of 540 mu m can achieve a mass capacity of 391.7 mAh g(-1) under 0.1 A g(-1), corresponding to 3.11 mAh cm(-2) of area-capacity and 57.64 mAh cm(-3) of volume-capacity, respectively. (C) 2021 Elsevier B.V. All rights reserved.