高耐用性 NaVO·1.63HO 纳米线正极用于水系锌离子电池
Highly Durable NaVO·1.63HO Nanowire Cathode for Aqueous Zinc-Ion Battery.
机构信息
State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, International School of Materials Science and Engineering , Wuhan University of Technology , Wuhan 430070 , China.
Materials Science and Engineering Department , University of Washington , Seattle , Washington 98195 , United States.
出版信息
Nano Lett. 2018 Mar 14;18(3):1758-1763. doi: 10.1021/acs.nanolett.7b04889. Epub 2018 Feb 8.
Rechargeable aqueous zinc-ion batteries are highly desirable for grid-scale applications due to their low cost and high safety; however, the poor cycling stability hinders their widespread application. Herein, a highly durable zinc-ion battery system with a NaVO·1.63HO nanowire cathode and an aqueous Zn(CFSO) electrolyte has been developed. The NaVO·1.63HO nanowires deliver a high specific capacity of 352 mAh g at 50 mA g and exhibit a capacity retention of 90% over 6000 cycles at 5000 mA g, which represents the best cycling performance compared with all previous reports. In contrast, the NaVO nanowires maintain only 17% of the initial capacity after 4000 cycles at 5000 mA g. A single-nanowire-based zinc-ion battery is assembled, which reveals the intrinsic Zn storage mechanism at nanoscale. The remarkable electrochemical performance especially the long-term cycling stability makes NaVO·1.63HO a promising cathode for a low-cost and safe aqueous zinc-ion battery.
可充电水系锌离子电池由于其低成本和高安全性，在电网级应用中极具吸引力；然而，其循环稳定性差阻碍了其广泛应用。在此，我们开发了一种具有 NaVO·1.63HO 纳米线正极和水系 Zn(CFSO)电解液的高稳定锌离子电池体系。NaVO·1.63HO 纳米线在 50 mA g 下具有 352 mAh g 的高比容量，并在 5000 mA g 下经过 6000 次循环后保持 90%的容量保持率，与所有先前的报告相比，这是最佳的循环性能。相比之下，NaVO 纳米线在 5000 mA g 下经过 4000 次循环后仅保持初始容量的 17%。组装了基于单根纳米线的锌离子电池，揭示了纳米尺度下内在的 Zn 存储机制。显著的电化学性能，特别是长期循环稳定性，使得 NaVO·1.63HO 成为一种很有前途的低成本、安全水系锌离子电池正极材料。
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