Construction of SnS2/SnO2 heterostructures with enhanced potassium storage performance.

Increasing attention has been focused on potassium ion batteries (KIBs) as promising energy-storage system (ESS) owing to the abundance and low-cost of potassium resources. Here, SnS 2 /SnO 2 heterostructures were successfully fixed onto stainless steel mesh (SnS 2 /SnO 2 /SSM) through a facile two-step hydrothermal method and used as anodes for KIBs. Due to the advantages of SnS 2 /SnO 2 heterostructures and good conductivity of SSM substrate, the SnS 2 /SnO 2 /SSM anodes display enhanced electrochemical performance. The SnS 2 /SnO 2 /SSM anodes deliver specific capacity of 394 mA h g⁻¹ at 50 mA g⁻¹ over 100 cycles, better than SnO 2 /SSM. Even at 500 mA g^-1 after 250 cycles, high capacity of 155 mA h g⁻¹ can still be obtained. [ABSTRACT FROM AUTHOR]