期刊
ACS APPLIED ENERGY MATERIALS
卷 3, 期 11, 页码 11183-11192出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsaem.0c02126
关键词
rechargeable zinc batteries; V2O5 cathode; H+ and Zn2+ co-intercalation; aqueous ZnSO4 electrolyte; nonaqueous electrolyte
资金
- Natural Science Foundation of Hebei Province [B202001001, B2019201160]
- National Natural Science Foundation of China [21805066, 22075067, 22075016]
- Top Young Talents Project of Hebei Education Department [BJ2019052]
- China Postdoctoral Science Foundation [2019T120191, 2018M640244]
- Chunhui Program of Ministry of Education of China
- Young Eli te Scient ists Sponsorship Program by CAST [2018QNRC001]
- Advanced Talents Incubation Program of Hebei University [521000981138]
- 111 Project [B12015]
Rechargeable aqueous zinc/vanadium pentoxide (Zn/V2O5) battery chemistry has recently attracted a great attention due to its high safety, material abundance, cost effectiveness, and desirable energy density. However, the reaction mechanism of V2O5 in an aqueous electrolyte remains a topic of discussion, and the limited life span resulting from the active materials dissolution hinders the further development of the Zn/V2O5 battery. Here, we report a long-life aqueous Zn/V2O5 battery using a simply ball-milled V2O5 cathode, a concentrated aqueous ZnSO4 electrolyte, and a metallic Zn anode. Electrochemical, structural, and spectroscopic analyses reveal that the V2O5 electrode experiences a highly reversible proton (H+) and Zn2+ co-intercalation mechanism in aqueous media, which differs from the conventional cognition that Zn2+ ion as the only charge carrier inserts into the V2O5 host. The electrolyte-involved (dis)appearance of zinc sulfate hydroxide on the electrodes' surface caused by Fr (de)intercalation has also been clarified. In addition, the optimized 3 M ZnSO4 electrolyte can not only suppress the dissolution of the V2O5 cathode but also enhance the stability of the Zn anode, thereby enabling the stable operation of the Zn/V2O5 battery with a reversible capacity of 357 mAh g(-1) after 2000 cycles without obvious decay at 2.0 A g(-1). This work opens up frontiers in the mechanism insight and electrolyte formulation for aqueous Zn batteries.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据