Yang Guangxu, Yang Shuhua, Sun Jinfeng, Duan Guangbin, Cao Bingqiang, Liu Zongming
School of Material Science and Engineering, University of Jinan, Jinan 250022, China.
Phys Chem Chem Phys. 2023 Sep 27;25(37):25435-25441. doi: 10.1039/d3cp03006g.
Aqueous Zn-ion batteries (AZIBs) have become one of the most promising energy storage devices due to their high safety and low cost. However, the development of stable cathodes with fast kinetics and high energy density is the key to achieving large-scale application of AZIBs. In this work, W-doped VO (W-VO) is developed by a one-step hydrothermal method. Benefiting from the pre-insertion of W and the introduction of the W-O bond, accomplishing an expanded lattice spacing and a stable structure, both improved kinetics and long cycle life are achieved. The W-VO delivers a specific capacity of 340.2 mA h g at 0.2 A g, an excellent high-rate capability with a discharge capacity of 186.9 mA h g at 10 A g, and long-term cycling stability with a capacity retention of 76.5% after 2000 cycles. The electrochemical performance of the W-VO has been greatly improved, compared with the pure VO. The W doping strategy proposed here also presents an encouraging pathway for developing other high-energy and stable cathodes.
水系锌离子电池（AZIBs）因其高安全性和低成本，已成为最具前景的储能装置之一。然而，开发具有快速动力学和高能量密度的稳定阴极是实现AZIBs大规模应用的关键。在这项工作中，通过一步水热法制备了W掺杂的VO（W-VO）。受益于W的预嵌入和W-O键的引入，实现了晶格间距扩大和结构稳定，动力学得到改善，循环寿命延长。W-VO在0.2 A g下的比容量为340.2 mA h g，在10 A g下具有出色的高倍率性能，放电容量为186.9 mA h g，并且具有长期循环稳定性，在2000次循环后容量保持率为76.5%。与纯VO相比，W-VO的电化学性能有了很大提高。这里提出的W掺杂策略也为开发其他高能量和稳定的阴极提供了一条令人鼓舞的途径。
