Rationally Designed Three-Layered TiO 2 @amorphous MoS 3 @Carbon Hierarchical Microspheres for Efficient Potassium Storage.

Amorphous MoS 3 has been an attractive electrode material for sodium-ion batteries and lithium-sulfur batteries. However, the potassium storage capability of amorphous MoS 3 remains unreported. Herein, the construction of hybrid hierarchical microspheres composed of amorphous MoS 3 nanosheets dual-confined with TiO 2 core, and nitrogen-doped carbon shell layer (denoted as TiO 2 @A-MoS 3 @NC) via a self-templating method, combined with a low-temperature sulfurization process as a new anode material for potassium-ion batteries (PIBs), is reported. Benefitting from the unique structural merits including unique 1D chain structure, disordered arrangement of atoms and a large number of defects of amorphous MoS 3 , more active heterointerfacial sites, effectively mitigated volume change, good electrical contact, and easy K + ion migration, the TiO 2 @A-MoS 3 @NC microspheres exhibit excellent potassium-storage performance with high specific capacity, superior rate capability, and cycling stability.