Enhanced Reversible Zinc Ion Intercalation in Deficient Ammonium Vanadate for High-Performance Aqueous Zinc-Ion Battery

Nano-Micro Letters

Quan Zong¹  Guozhong Cao¹  Chaofeng Liu¹  Mohamad Alsalhi²  Muhammad Atif²  Wei Du³  Zheng Zhou³  Qilong Zhang³  Hui Yang³ 

[1] Department of Materials Science and Engineering, University of Washington;Research Chair On Laser Diagnosis of Cancers, Department of Physics and Astronomy, College of Science, King Saud University;School of Materials Science and Engineering, State Key Lab Silicon Mat, Zhejiang University;

关键词: Deficient ammonium vanadate;    Large interlayer spacing;    Reversible redox reaction;    Electrochemical mechanism;   

DOI  :  10.1007/s40820-021-00641-3

来源: DOAJ

【 摘 要 】

Abstract Ammonium vanadate with bronze structure (NH4V4O10) is a promising cathode material for zinc-ion batteries due to its high specific capacity and low cost. However, the extraction of $${\text{NH}}_{{4}}^{ + }$$ NH 4 + at a high voltage during charge/discharge processes leads to irreversible reaction and structure degradation. In this work, partial $${\text{NH}}_{{4}}^{ + }$$ NH 4 + ions were pre-removed from NH4V4O10 through heat treatment; NH4V4O10 nanosheets were directly grown on carbon cloth through hydrothermal method. Deficient NH4V4O10 (denoted as NVO), with enlarged interlayer spacing, facilitated fast zinc ions transport and high storage capacity and ensured the highly reversible electrochemical reaction and the good stability of layered structure. The NVO nanosheets delivered a high specific capacity of 457 mAh g−1 at a current density of 100 mA g−1 and a capacity retention of 81% over 1000 cycles at 2 A g−1. The initial Coulombic efficiency of NVO could reach up to 97% compared to 85% of NH4V4O10 and maintain almost 100% during cycling, indicating the high reaction reversibility in NVO electrode.

【 授权许可】

Unknown