Achieving Both High Voltage and High Capacity in Aqueous Zinc‐Ion Battery for Record High Energy Density. (17th September 2019)

• Record Type: Journal Article
• Authors: Ma, Longtao; Li, Na; Long, Changbai; Dong, Binbin; Fang, Daliang; Liu, Zhuoxin; Zhao, Yuwei; Li, Xinliang; Fan, Jun; Chen, Shimou; Zhang, Suojiang; Zhi, Chunyi
• Is Part Of: Advanced functional materials. Volume 29:Number 46(2019)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2019-09-17
• Subjects: cobalt pillared -- high capacity -- high‐energy density -- high voltage -- long lifespan; Materials -- Periodicals; Chemical vapor deposition -- Periodicals; 620.11
• DOI: 10.1002/adfm.201906142
• Languages: English
• ISSNs: 1616-301X

Abstract

Abstract: In this work, a high‐voltage output and long‐lifespan zinc/vanadium oxide bronze battery using a Co0.247 V2 O5 ⋅0.944H2 O nanobelt is developed. The high crystal architecture could enable fast and reversible Zn 2+ 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 Zn 2+ 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. Abstract : Zn/vanadium oxide batteries can deliver a capacity greater than 300 mAh g −1, but their operational voltage is always very low. A 1.7 V high‐voltage Zn/vanadium battery is developed using a Co0.247 V2 O5 ⋅ 0.944H2 O cathode. Its capacity at greater than 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.