Zhao Ming, Li Shilong, Wu Xiang, Sun Lixian
School of Materials Science and Engineering, Shenyang University of Technology, Shenyang 110870, P.R. China.
Guangxi Key Laboratory of Information Materials, Guangxi Collaborative Innovation Center of Structure and Property for New Energy Materials, Guilin University of Electronic Technology, Guilin 541004, P.R. China.
iScience. 2024 Sep 11;27(10):110926. doi: 10.1016/j.isci.2024.110926. eCollection 2024 Oct 18.
In the past decade, vanadates have attracted one's attention as the electrode materials for aqueous zinc ion batteries (AZIBs). Nevertheless, their structural instability and sluggish ion/electron dynamics lead to an inevitable decline in the electrochemical performance. To address these issues, we introduce oxygen vacancies into NHVO nanosheets to improve the ion transport rate during the electrochemical reaction. The prepared NHVO-40 samples provide many active sites compared to NHVO materials. The assembled cell delivers a capacity of 452.03 mAh g at a current density of 0.2 A g. It also presents a retention rate of 94.6% at 10 A g after 4000 times cycling. In addition, they still possess an energy density of 332.5 Wh kg at a power density of 70 W kg.
在过去十年中，钒酸盐作为水系锌离子电池（AZIBs）的电极材料引起了人们的关注。然而，它们的结构不稳定性和缓慢的离子/电子动力学导致电化学性能不可避免地下降。为了解决这些问题，我们在NHVO纳米片中引入氧空位，以提高电化学反应过程中的离子传输速率。与NHVO材料相比，制备的NHVO-40样品提供了许多活性位点。组装的电池在0.2 A g的电流密度下提供452.03 mAh g的容量。在4000次循环后，它在10 A g时的保留率也达到了94.6%。此外，在70 W kg的功率密度下，它们仍然具有332.5 Wh kg的能量密度。
