Achieving Both High Voltage and High Capacity in Aqueous Zinc‐Ion Battery for Record High Energy Density

Abstract

In this work, a high‐voltage output and long‐lifespan zinc/vanadium oxide bronze battery using a Co0.247V2O5⋅0.944H2O nanobelt is developed. The high crystal architecture could enable fast and reversible Zn2+ intercalation/deintercalation at highly operational voltages. The developed battery exhibits a high voltage of 1.7 V and delivers a high capacity of 432 mAh g−1 at 0.1 A g−1. The capacity at voltages above 1.0 V reaches 227 mAh g−1, which is 52.54% of the total capacity and higher than the values of all previously reported Zn/vanadium oxide batteries. Further study reveals that, compared with the pristine vanadium oxide bronze, the absorption energy for Zn2+ increases from 1.85 to 2.24 eV by cobalt ion intercalation. Furthermore, it also shows a high rate capability (163 mAh g−1 even at 10 A g−1) and extraordinary lifespan over 7500 cycles, with a capacity retention of 90.26%. These performances far exceed those for all reported zinc/vanadium oxide bronze batteries. Subsequently, a nondrying and antifreezing tough flexible battery with a high energy density of 432 Wh kg−1 at 0.1 A g−1 is constructed, and it reveals excellent drying and freezing tolerance. This research represents a substantial advancement in vanadium materials for various battery applications, achieving both a high discharge voltage and high capacity.

In Situ Electrochemical Synthesis of MXenes without Acid/Alkali Usage in/for an Aqueous Zinc Ion Battery

“…0°, and 31.4°, corresponding to (001), (011), and (111) planes, respectively, appear and become stronger as the cycle progresses. [36][37][38] Continued to go deep into the cycle, peaks at 36.4°, 42.6° and peaks at 21.2°, 31.6° representing AlF 3 (JCPDS: 80-1007) and Al 2 O 3 (JCPDS: 50-1496) are also detected. [6,14] Regarding stage III of the electrodes in both fully discharged and charged states, there are only negligible changes in XRD patterns except the enhanced V 2 O 5 signals, as displayed in Figure S6 in the Supporting Information.…”

Uniform Virus‐Like Co–N–Cs Electrocatalyst Derived from Prussian Blue Analog for Stretchable Fiber‐Shaped Zn–Air Batteries

“…Prussian blue (PB) and Prussian blue analogs (PBAs), possessing a general chemical formula of A 2 M[M′(CN) 6 ](A = alkaline metal ions, M/M′ = Fe, Co, Mn, etc. ), easily being modified to various types of structures via chemical methods or heat methods, which has been applied for energy storage applications frequently . Besides, owing to the composition of PB/PBAs, direct heat treatment of them in inert atmosphere will be supposed to produce M–NC materials which have been considered as promising electrocatalyst for energy conversion applications.…”

Rechargeable Aqueous Zinc‐Ion Batteries with Mild Electrolytes: A Comprehensive Review

“…To overcome this problem, Ma and Zhi et al [89] introduced cobalt ions and water molecules into V 2 O 5 as interlayer pillars, and successfully developed a novel high-voltage and longlifespan cobalt vanadium bronze (Co 0.247 V 2 O 5 • 0.944H 2 O). The pre-intercalation of cobalt ions remarkably increased the absorption energy of Zn 2 + , promoting the operational voltage of ZIBs upto 1.7 V, with 227 of 432 mAh g À 1 discharge capacity locating above 1.0 V (Figure 6e).…”