Highly Durable Na 2 V 6 O 16 ·1.63H 2 O Nanowire Cathode for Aqueous Zinc-Ion Battery

作者：Ping Hu, Ting Zhu, Xuanpeng Wang, Xiujuan Wei, Mengyu Yan, Jiantao Li, Wen Luo, Wei Yang, Wencui Zhang, Liang Zhou, Zhiqiang Zhou, Liqiang Mai · 发表于：Nano Letters · 年份：2018 · DOI：10.1021/acs.nanolett.7b04889 · 被引用次数：709 · 研究领域：Advanced battery technologies research、Supercapacitor Materials and Fabrication、Advanced Battery Technologies Research

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 Na 2 V 6 O 16 ·1.63H 2 O nanowire cathode and an aqueous Zn(CF 3 SO 3 ) 2 electrolyte has been developed. The Na 2 V 6 O 16 ·1.63H 2 O nanowires deliver a high specific capacity of 352 mAh g –1 at 50 mA g –1 and exhibit a capacity retention of 90% over 6000 cycles at 5000 mA g –1, which represents the best cycling performance compared with all previous reports. In contrast, the NaV 3 O 8 nanowires maintain only 17% of the initial capacity after 4000 cycles at 5000 mA g –1 . A single-nanowire-based zinc-ion battery is assembled, which reveals the intrinsic Zn 2+ storage mechanism at nanoscale. The remarkable electrochemical performance especially the long-term cycling stability makes Na 2 V 6 O 16 ·1.63H 2 O a promising cathode for a low-cost and safe aqueous zinc-ion battery.