Rapid synthesis of high-entropy antimonides under air atmosphere using microwave method to ultra-high energy density supercapacitors

Electrode materials based on battery-type energy storage principles have high capacity and energy density . However, the drastic structural volume changes caused by electrochemical reaction processes reduce the cyclic durability of the materials. The construction of high-entropy structures can enhance the material structure to accommodate the volume changes during ion embedding/detachment. In this study, a new high-entropy antimonide battery-type electrode material was synthesized for the first time using a domestic microwave oven under air atmosphere. Its lattice and structure were stabilized using high-entropy multi-element system to improve the electrode cycling stability while ensuring its high capacity. The high-entropy antimonides have a capacity of 1850.0 C g −1 at 1 A g −1 and maintain 82.0 % of the initial capacity after 10,000 cycles. Furthermore, the battery-supercapacitor hybrid device (BSH) assembled with Bi 2 O 3 @single-walled carbon nanotube (SWCNT) has a reversible capacity of 600.0 C g −1 , and the BSH showed an energy density of 125.0 Wh kg −1 at a power density of 750.0 W kg −1 . The BSH meets the standard of secondary batteries, which provides a new feasible method for building energy storage devices with good performance.