A red phosphorus/mesoporous carbon anode for potassium-ion storage

Red phosphorus/mesoporous carbon (RP/CMK-3) composite was fabricated by a facile ultrasonic treatment and freeze-drying approach. As the anode for potassium -ion batteries, RP/CMK-3 with the weight ratio of 2:1 between RP and CMK-3 exhibits high capacities of 192.8 mAh g-1 at 200 mA g-1 and 232.7 mAh/g after 100 cycles at 50 mA g-1. Such a good K+ storage behavior can be attributed to small -size RP particles combined with CMK-3 through P -C bonds, which not only provide a feasible conductive network but also suppress the volume change of RP during repeated potassiation/de-potassiation processes.