Deficiency and Surface Engineering Boosting Electronic and Ionic Kinetics in NH4V4O10 for High-Performance Aqueous Zinc-Ion Battery

By Fuhan Cui, Dashuai Wang, Fang Hu, Xin Yu, C. Guan, Guihong Song, Feng Xu, K. Zhu. Energy Storage Materials, 2021

167 citations recorded by the source corpus.

Abstract 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 1A g−1), impressive rate ability (211 mAh g−1 at the 15A 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.

Subfields: Electrical and Electronic Engineering, Polymers and Plastics

View Paper: https://www.semanticscholar.org/paper/21991e8c0549b5c6b306aef6d717e2dcff7caf11