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 MoS 2 /carbon framework heterogeneous electrodes (abbreviated as, MoS 2 @C F ) are fabricated by a simple vacuum infiltration and heating process. The interconnected ultrathin MoS 2 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 MoS 2 @C F electrodes exhibit superior elasticity and recoverability. After 180° 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 ~ 99%). Full-cells assembled with MoS 2 @C F anodes and Na 3 V 2 (PO 4 ) 3 cathodes show high reversible capacity (~ 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 MoS 2 @C F electrodes in large-scale flexible sodium-ion storage devices.