Dual Pre-Insertion Strategy to Achieve High-Performance Vanadium Oxide toward Advanced Cylindrical Zinc Ion Batteries
Xiaohe Ren, Hongwei Liu, Nengze Wang, Lei Hu, Mengxuan Sun, Liwen Bo, Zhijie Li, Chunyang Jia
Abstract
The low electrical conductivity of vanadium-based oxides and their structural instability have been major challenges as cathodes for zinc ion batteries (ZIBs). Pre-insertion strategies are one means of effectively improving the structural stability of cathode materials. Furthermore, it is important to develop a safe and simple method to produce vanadium-based cathode material in large quantities for commercialized ZIBs. Thus, this work prepared a Zn 2+ and H 2 O intercalated V 2 O 5 (ZnVO·1.2H 2 O) as cathode by one-step stirring. Zn 2+ and H 2 O intercalation expanded the layer spacing and promoted the diffusion kinetics of the ZnVO·1.2H 2 O electrode material. As a result, ZnVO·1.2H 2 O nanowire electrode materials exhibit a higher specific capacity and cycle performance. Even at a current density of 4 A g –1, almost 100% of the initial capacity is still retained after 3000 cycles. In addition, benefiting from this large-scale preparation technology, this work applied the electrode materials to cylindrical ZIBs. The 21 700 cylindrical ZIB with a high mass load can reach a maximum discharge capacity of 75.03 mAh at a current of 0.4 A. This work not only provides an experimental basis for the preparation of high-capacity, homogeneous electrode materials but also provides a potential reference for the development of cylindrical ZIBs.