Electrochemical exfoliation of porous antimonene as anode materials for sodium-ion batteries
Yingchang Yang, Senling Leng, Wei Shi
Abstract
Porous antimony has attracted wide attention in the area of energy storage as it can accommodate large volume change and facilitate Na+ ions diffusion. Herein, stable porous antimonene sheets with mesopores ranging from 2 to 50 nm have successfully fabricated through electrochemical exfoliation of layered bulk antimony rod in tetramethylammonium hydroxide aqueous solution with the aid of large TMA+ cations insertion and strong alkaline electrolyte environment. When utilized as anode materials for sodium-ion batteries, the as-exfoliated porous antimonene can deliver a high specific capacity of 569.1 mAh g−1 upon 200 cycles at 100 mA g−1, and it can still keep a high capacity of 277.8 mAh g−1 even at fast charge/discharge rate of 5000 mA g−1.