材料科学
电化学
阴极
水溶液
储能
化学工程
纳米技术
电极
电气工程
物理化学
化学
热力学
物理
工程类
功率(物理)
作者
Wentao Dong,Min Du,Feng Zhang,Xiaofei Zhang,Zhenyu Miao,Houzhen Li,Yuanhua Sang,Jianjun Wang,Hong Liu,Shuhua Wang
标识
DOI:10.1021/acsami.0c19309
摘要
Rechargeable aqueous zinc-ion batteries (ZIBs) are promising portable and large-scale grid energy storage devices, as they are safe and economical. However, developing suitable ZIB cathode materials with excellent cycling performance characteristics remains a challenging task. Here, ammonium heptavanadate (NH4)2V7O16·3.2H2O (NHVO) nanosquares with mixed-valence V5+/V4+ as a cathode are developed for high-performance ZIBs. The layered NHVO shows a capacity of 362 mA h g–1 at 0.05 A g–1, with a high energy density of 263.5 W h kg–1. It exhibits an initial specific capacity of 250.7 mA h g–1 at a current density of 4 A g–1 and retains 255 mA h g–1 capacity after 1000 charge/discharge cycles. The V7O16-based cathode was demonstrated with a phase transition to the V2O5-based cathode upon initial cycling. Moreover, the in situ generated V2O5-based cathodes show excellent electrochemical properties, which provide a different perspective on the electrochemical reaction of cathode materials for aqueous ZIBs.
科研通智能强力驱动
Strongly Powered by AbleSci AI