材料科学
电化学
表面工程
阴极
石墨烯
密度泛函理论
离子
氧化物
储能
表面改性
电化学动力学
水溶液
化学工程
纳米技术
电极
物理化学
热力学
化学
计算化学
冶金
物理
工程类
功率(物理)
有机化学
作者
Fuhan Cui,Dashuai Wang,Fang Hu,Xin Yu,Changlong Guan,Guihong Song,Feng Xu,Kai Zhu
标识
DOI:10.1016/j.ensm.2021.10.001
摘要
Aqueous zinc-ion batteries present their unique advantages, such as cost-efficient and non-flammability for large-scale energy storage. However, their widespread application is hindered by the development of cathode materials, sluggish intrinsic ion/electron kinetics, and unsatisfied structural stability. Herein, we report a high-performance NH4V4O10 cathode with oxygen vacancy (denoted as NH4V4O10-x) and reduced graphene oxide (rGO) surface modification. The oxygen vacancies enhance the Zn2+ diffusion ability and stabilize the NH4V4O10 structure. Meanwhile, the density functional theory calculations further confirm the deficiency engineering leads to high electronic conductivity, weak electrostatic interaction, and low Zn2+ diffusion barrier. In addition, the rGO surface modification provides fast electron transfer. The NH4V4O10-x@rGO delivers high capacity (391 mAh g−1 at 1 A g−1), impressive rate ability (211 mAh g−1 at the 15 A g−1), and stable cycle performance with 90.5% capacity retention after 2000 cycles. This work provides a reasonable strategy to design cathode materials with deficiency and surface engineering to improve the electrochemical performance of zinc-ion batteries.
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