期刊
BATTERIES & SUPERCAPS
卷 3, 期 3, 页码 254-260出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/batt.201900145
关键词
hydrated sodium vanadate; free-standing; paper electrode; high stability; Zn-ion battery
资金
- National Natural Science Foundation of China [21606003, 51802044, 51972067]
- Guangdong Natural Science Funds for Distinguished Young Scholar [2019B151502039]
- 111 project [D18023]
- Singapore MOE AcRF [2018-T2-1-010, MOE2017-T2-2-069]
- National Research Foundation of Singapore (NRF) [NRF2016NRF-NRFI001-22]
Making batteries more sustainable and affordable is seen as fundamental for enabling the electric grid to depend on power generated from renewable sources. In this context, zinc-ion batteries (ZIBs) are seen as promising candidates to suit the niche application stemming from the appealing properties of Zn, but their advancement is plagued by a limited choice of cathode and a better understanding of structure-property relationships that underpin the electrochemistry. Here, we demonstrate a hydrothermal method to prepare Na2V6O16 . 3H(2)O nanobelts with high degree of homogeneity and preferred orientation, enabling the construction of free-standing paper electrode for ZIBs. By virtue of the favorable structural features of the Na2V6O16 . 3H(2)O nanobelts that arise from the pillaring effect of interlayer metal ions/structural water and nanoscale morphology, the electrode displays good cycling performance (281 and 142 mAh g(-1) is achieved at 2.0 and 5.0 A g(-1) after 5000 cycles, respectively) with nearly 100 % Coulombic efficiency and impressive rate capability (216 and 167 mAh g(-1) are achieved at 3.0 and 5.0 A g(-1) respectively). Mechanistic study on the intercalation reaction of the Na2V6O16 . 3H(2)O nanobelts using ex situ XRD and HRTEM reveals their good structural and electrochemical reversibility, which enlightens the material advantages as promising cathode for ZIBs.
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