首页> 美国卫生研究院文献>Advanced Science >Nitrogen‐Vacancy‐Rich VN Clusters Embedded in Carbon Matrix for High‐Performance Zinc Ion Batteries
【2h】

Nitrogen‐Vacancy‐Rich VN Clusters Embedded in Carbon Matrix for High‐Performance Zinc Ion Batteries

机译:嵌入碳基体中的富氮空位 VN 团簇用于高性能锌离子电池

代理获取
本网站仅为用户提供外文OA文献查询和代理获取服务,本网站没有原文。下单后我们将采用程序或人工为您竭诚获取高质量的原文,但由于OA文献来源多样且变更频繁,仍可能出现获取不到、文献不完整或与标题不符等情况,如果获取不到我们将提供退款服务。请知悉。

摘要

Vanadium nitride (VN) is a potential cathode material with high capacity and high energy density for aqueous zinc batteries (AZIBs). However, the slow kinetics resulting from the strong electrostatic interaction of the electrode materials with zinc ions is a major challenge for fast storage. Here, VN clusters with nitrogen‐vacancy embedded in carbon (C) (Nv‐VN/C‐SS‐2) are prepared for the first time to improve the slow reaction kinetics. The nitrogen vacancies can effectively accelerate the reaction kinetics, reduce the electrochemical polarization, and improve the performance. The density functional theory (DFT) calculations also prove that the rapid adsorption and desorption of zinc ions on Nv‐VN/C‐SS‐2 can release more electrons to the delocalized electron cloud of the material, thus adding more active sites. The Nv‐VN/C‐SS‐2 exhibits a specific capacity and outstanding cycle life. Meanwhile, the quasi‐solid‐state battery exhibits a high capacity of 186.5 mAh g−1, ultra‐high energy density of 278.9 Wh kg−1, and a high power density of 2375.1 W kg−1 at 2.5 A g−1, showing excellent electrochemical performance. This work provides a meaningful reference value for improving the comprehensive electrochemical performance of VN through interface engineering.
机译:氮化钒 (VN) 是一种潜在的高容量和高能量密度的正极材料,适用于水性锌电池 (AZIB)。然而,电极材料与锌离子的强静电相互作用导致的缓慢动力学是快速储存的主要挑战。在这里,首次制备了嵌入碳 (C) 中氮空位的 VN 簇 (Nv-VN/C-SS-2) 以改善慢反应动力学。氮空位可以有效加速反应动力学,减少电化学极化,提高性能。密度泛函理论 (DFT) 计算还证明,锌离子在 NV-VN/C-SS-2 上的快速吸附和解吸可以将更多的电子释放到材料的离域电子云中,从而增加更多的活性位点。Nv-VN/C-SS-2 表现出特定的容量和出色的循环寿命。同时,准固态电池表现出 186.5 mAh g-1 的高容量、278.9 Wh kg-1 的超高能量密度和 2.5 A g-1 时 2375.1 W kg-1 的高功率密度,表现出优异的电化学性能。这项工作为通过界面工程提高VN的综合电化学性能提供了有意义的参考价值。

著录项

代理获取

客服邮箱:kefu@zhangqiaokeyan.com

京公网安备:11010802029741号 ICP备案号:京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有
  • 客服微信

  • 服务号