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, SnS2/SnO2 heterostructures were successfully fixed onto stainless steel mesh (SnS2/SnO2/SSM) through a facile two-step hydrothermal method and used as anodes for KIBs. Due to the advantages of SnS2/SnO2 heterostructures and good conductivity of SSM substrate, the SnS2/SnO2/SSM anodes display enhanced electrochemical performance. The SnS2/SnO2/SSM anodes deliver specific capacity of 394 mA h g−1 at 50 mA g−1 over 100 cycles, better than SnO2/SSM. Even at 500 mA g-1 after 250 cycles, high capacity of 155 mA h g−1 can still be obtained.