Na 2 V 6 O 16 ·3H 2 O Barnesite Nanorod: An Open Door to Display a Stable and High Energy for Aqueous Rechargeable Zn-Ion Batteries as Cathodes

作者：Vaiyapuri Soundharrajan, Balaji Sambandam, Sungjin Kim, Muhammad Hilmy Alfaruqi, Dimas Yunianto Putro, Jeonggeun Jo, Seokhun Kim, Vinod Mathew, Yang‐Kook Sun, Jaekook Kim · 发表于：Nano Letters · 年份：2018 · DOI：10.1021/acs.nanolett.7b05403 · 被引用次数：564 · 研究领域：Advanced battery technologies research、Advancements in Battery Materials、Supercapacitor Materials and Fabrication

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 Na 2 V 6 O 16 ·3H 2 O nanorods employed as a positive electrode for ARZIBs, which display superior electrochemical Zn storage properties. A reversible Zn 2+ -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 –1 ). The battery offers a specific energy of 90 W h kg –1 at a specific power of 15.8 KW kg –1, enlightening the material advantages for an eco-friendly atmosphere.