Bi_(2)S_(3) nanorods encapsulated in iodine-doped graphene frameworks with enhanced potassium storage properties

Bismuth sulfide(Bi_(2)S_(3))is a promising anode material for high-performance potassium ion batteries due to its high theoretical capacity.However,the poor conductivity and substantial volume expansion hinder its practical application.We proposed an iodine-doped graphene encapsulated Bi_(2)S_(3)nanorods composite(Bi_(2)S_(3)/IG)as an efficient anode for PIBs.The uniform-sized Bi_(2)S_(3)nanorods evenly in-situ encapsulated in iodine-doped graphene framework,facilitating the electron transportation and structural stability.The potassium storage performance was evaluated in three electrolytes,with the best option of 5 mol/L KFSI in DME.The reversible capacity of representative Bi_(2)S_(3)/IG reached 453.5 m Ah/g at 50 m A/g.Meanwhile,it could deliver an initial reversible capacity of 413.6 m Ah/g at 100 m A/g,which maintained 256.9 m Ah/g after 200 cycles.The proposed strategy contributes to improving potassium storage performance of metal sulfide anodes.