Department of Materials Science and Engineering , Chonnam National University , Gwangju 500-757 , South Korea.
Metallurgy Department , Sumbawa University of Technology , Jl. Raya Olat Maras , Sumbawa, West Nusa Tenggara 84371 , Indonesia.
Nano Lett. 2018 Apr 11;18(4):2402-2410. doi: 10.1021/acs.nanolett.7b05403. Epub 2018 Mar 29.
Owing to their safety and low cost, aqueous rechargeable Zn-ion batteries (ARZIBs) are currently more feasible for grid-scale applications, as compared to their alkali counterparts such as lithium- and sodium-ion batteries (LIBs and SIBs), for both aqueous and nonaqueous systems. However, the materials used in ARZIBs have a poor rate capability and inadequate cycle lifespan, serving as a major handicap for long-term storage applications. Here, we report vanadium-based NaVO·3HO nanorods employed as a positive electrode for ARZIBs, which display superior electrochemical Zn storage properties. A reversible Zn-ion (de)intercalation reaction describing the storage mechanism is revealed using the in situ synchrotron X-ray diffraction technique. This cathode material delivers a very high rate capability and high capacity retention of more than 80% over 1000 cycles, at a current rate of 40C (1C = 361 mA g). The battery offers a specific energy of 90 W h kg at a specific power of 15.8 KW kg, enlightening the material advantages for an eco-friendly atmosphere.
由于水系可充锌离子电池（ARZIB）的安全性和低成本，与碱金属离子电池（LIB 和 SIB）相比，其在水系和非水系中都更适用于电网规模的应用。然而，ARZIB 中使用的材料的倍率性能较差，循环寿命不足，这成为长期存储应用的主要障碍。在这里，我们报告了一种用作 ARZIB 正极的基于钒的 NaVO·3HO 纳米棒，其表现出优异的电化学 Zn 存储性能。使用原位同步辐射 X 射线衍射技术揭示了描述存储机制的可逆 Zn 离子（脱）插层反应。这种正极材料在 40C 的电流速率下（1C = 361 mA g），经过 1000 次循环后，具有非常高的倍率性能和超过 80%的高容量保持率。该电池在 15.8 KW kg 的比功率下提供 90 W h kg 的比能量，为环保型氛围展示了材料优势。
