Enhanced Stability of Vanadium-Based Electrode Materials Using Multi-Component Hybrids for High-Performance Zinc-Ion Batteries
Zhiqiang Dai, Xueqin Zhang, Kittima Lolupiman, Chengwu Yang, Pattaraporn Woottapanit, Wanwisa Limphirat, Suttipong Wannapaiboon, Xinyu Zhang, Jiaqian Qin
Abstract
The limited availability of cathode materials for rechargeable aqueous zinc-ion batteries (ZIBs), which have great potential for grid-scale energy storage applications, remains a significant obstacle to development. In this study, we proposed a Li 3 VO 4 –LiV 2 O 5 -based (LiVO-w) nanocomposite structure obtained by simple high-temperature calcination and water washing as a high-performance cathode. The LiVO-w cathode demonstrates a high specific capacity (310.43 mAh g –1 at 1 A g –1 and 130.52 mAh g –1 at 20 A g –1 ) and excellent cycling stability (100% capacity retention after 4000 cycles at 10 A g –1 and 85.13% capacity retention after 10,000 cycles). In addition, ex situ X-ray diffraction (XRD) shows the structural transformation of LiVO-w during the self-assembly process. During the first charge process, the multivalent and multistructured LiVO-w undergoes an increase in the valence of V, accompanied by the generation of Zn 3 (OH) 2 V 2 O 7 ·H 2 O on the surface of the matrix. The charge and discharge process after self-assembly mainly corresponds to the generation and decomposition of Zn 3 (OH) 2 V 2 O 7 ·H 2 O. This excellent self-assembled matrix realizes the realization of LiVO-w cathodes with high capacity and high-capacity retention, representing a major advancement in the commercial development of ZIBs for the development of LiVO-w positive electrode materials.