Affiliation:
1. College of Materials and Chemistry China Jiliang University Hangzhou Zhejiang 310018 P. R. China
2. State Key Lab of Silicon Materials Zhejiang University Hangzhou 310027 P. R. China
3. School of Materials Science and Engineering Tongji University Shanghai 201804 P. R. China
4. Department of Materials Science and Engineering University of Washington Seattle WA 98195 USA
Abstract
AbstractVanadyl phosphate (VOPO4·2H2O) has been regarded as one of the most promising cathode materials for aqueous Zn‐ion batteries due to its distinct layered structure. However, VOPO4·2H2O has not yet demonstrated the exceptional Zn ion storage performance owing to the structural deterioration during repeated charging/discharging process and poor intrinsic conductivity. In this work, 2D sodium vanadyl phosphate (NaVOPO4·0.83H2O, denoted as NaVOP) is designed as a cathode material for Zn‐ion batteries, in which sodium ions are preinserted into the interlayer, replacing part of water. Benefiting from the in situ surface oxidization, improved electronic conductivity, and increased hydrophobicity, the NaVOP electrode exhibits a high discharge capacity of 187 mAh g−1 at 0.1 A g−1 after activation, excellent rate capability and enhanced cycling performance with 85% capacity retention after 1500 cycles at 1 A g−1. The energy storage mechanism of the NaVOP nanoflakes based on the rapid Zn2+ and H+ intercalation pseudocapacitance are investigated via multiple ex situ characterizations.
Funder
National Natural Science Foundation of China
Fundamental Research Funds for the Central Universities
Subject
Biomaterials,Biotechnology,General Materials Science,General Chemistry
Cited by
1 articles.
订阅此论文施引文献
订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献