SnO2 nanosheets grown on stainless steel mesh as a binder free anode for potassium ion batteries

Potassium-ion batteries (KIBs) have attracted intensive attention in recent years due to the resource-abundance and low cost of potassium. Here, for the first time, SnO2 nanosheets grown on stainless steel mesh (SnO2/SSM) were used as a novel binder free anode for KIBs. A high capacity of 351 mAh g(-1) is achieved after 100 cycles at current density of 50 mA g(-1). Even more, a high capacity of 128 mAh g(-1) can be obtained at 1000 mA g(-1) after 200 cycles. These good electrochemical performances are mainly due to the large surface area of SnO2 nanosheets and the roles of current collector and stable conductive skeleton SSM played.