β-VO2/carbon nanotubes core-shelled microspheres and their applications for advanced cathode in aqueous zinc ion batteries

The dissolution of cathode material is imminently resolved in the commercial application of aqueous zinc-ion batteries (ZIBs). The beta-VO2/carbon nanotubes (CNTs) microspheres with various constructions were acquired by the ultrasonic atomization depositions. beta-VO2/CNTs core-shelled microspheres, which the VO2 cores are homogeneously covered by CNTs shells, can suppress more effectively the VO2 dissolution. The beta-VO2/CNTs core-shelled microspheres exhibited a higher capacity of 380 mAh g(-1) at the current density of 0.05 A g(-1), and maintained a steadier capacity retention of 80% after 7800 cycles. The construction of perfect CNTs shells is considerably effective to restrain the dissolution of beta-VO2 and improve the cycle stability. (C) 2021 Elsevier Ltd. All rights reserved.

Automated summary

The dissolution of cathode material in aqueous zinc-ion batteries can be effectively suppressed by constructing beta-VO2/CNTs core-shelled microspheres, leading to improved cycle stability and higher capacity retention. The study shows that the perfect structure of CNTs shells plays a crucial role in restraining the dissolution of beta-VO2.