Superelastic 3D few-layer MoS2/carbon framework heterogeneous electrodes for highly reversible sodium-ion batteries

Rational design of electrode materials for sodium-ion batteries with high flexibility is still challenging. Here, superelastic 3D few-layer MoS2/carbon framework heterogeneous electrodes (abbreviated as, MoS2@C-F) are fabricated by a simple vacuum infiltration and heating process. The interconnected ultrathin MoS2 network filled with carbon framework forms a 3D heterogeneous network with hierarchical pore structure. The unique structure of the electrodes results in excellent mechanical and electrochemical performances. The MoS2@C-F electrodes exhibit superior elasticity and recoverability. After 180 degrees bending repeatedly, the electrodes still can recover their initial sizes. Moreover, the electrodes show outstanding cycling stabilities with high reversible capacities reaching up 240 mA h g(-1) after 500 cycles at 1 A g(-1) (capacity retention of similar to 99%). Full-cells assembled with MoS2@C-F anodes and Na3V2(PO4)(3) cathodes show high reversible capacity (similar to 252 mA h g(-1) at 0.5 A g(-1)). Overall, the superior mechanical properties and high electrochemical performances indicate the promising potential of MoS2@C-F electrodes in large-scale flexible sodium-ion storage devices.