期刊
ACS ENERGY LETTERS
卷 3, 期 6, 页码 1366-1372出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsenergylett.8b00565
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资金
- Project of One Province, One University, National Postdoctoral Program for Innovative Talents [BX201600014]
- Fundamental Research Funds for the Central Universities [FRF-TP-16-078A1]
- 111 project [B12015]
We report an aqueous Zn-V2O5 battery chemistry employing commercial V2O5 cathode, Zn anode, and 3 M Zn(CF3SO3)(2) electrolyte. We elucidate the Zn-storage mechanism in the V2O5 cathode to be that hydrated Zn2+ can reversibly (de)intercalate through the layered structure. The function of the co intercalated H2O is revealed to be shielding the electrostatic interactions between Zn2+ and the host framework, accounting for the enhanced kinetics. In addition, the pristine bulk V2O5 gradually evolves into porous nanosheets upon cycling, providing more active sites for Zn2+ storage and thus rendering an initial capacity increase. As a consequence, a reversible capacity of 470 mAh g(-1) at 0.2 A g(-1) and a long-term cyclability with 91.1% capacity rentention over 4000 cycles at 5 A g(-1) are achieved. The combination of the good battery performance, safety, scalable materials synthesis, and facile cell assembly indicates this aqueous Zn-V2O5 system is promising for stationary grid storage applications.
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