Boosting Zinc-Ion Storage Capability by Effectively Suppressing Vanadium Dissolution Based on Robust Layered Barium Vanadate

Abstract

Vanadium-based compounds with an open framework structure have become the subject of much recent investigation into aqueous zinc-ion batteries (AZIBs) due to high specific capacity. However, there are some issues with vanadium dissolution from a cathode framework as well as the generation of byproducts during discharge that should not be ignored, which could cause severe capacity deterioration and inadequate cycle life. Herein, we report several barium vanadate nanobelt cathodes constructed of two sorts of architectures, i.e., Ba 1., which are controllably synthesized by tuning the amount of barium precursor. Benefiting from the robust architecture, layered Ba x V 3 O 8 -type nanobelts (Ba 1.2 V 6 O 16 •3H 2 O) exhibit superior rate capability and long-term cyclability owing to fast zinc-ion kinetics, enabled by efficiently suppressing cathode dissolution as well as greatly eliminating the generation of byproduct Zn 4 SO 4 (OH) 6 •xH 2 O, which provides a reasonable strategy to engineer cathode materials with robust architectures to improve the electrochemical performance of AZIBs.

Interlayer Doping in Layered Vanadium Oxides for Low‐cost Energy Storage: Sodium‐ion Batteries and Aqueous Zinc‐ion Batteries

“…Such strange change of d‐spacing seems to be related to the release of pre‐intercalated Mg 2+ , especially during the first cycle. Meanwhile, the vanadium dissolution of the electrode immersed in electrolyte could also be observed in Ba x V 2 O 5 ⋅ n H 2 O compare with barium vanadates (Figure 6c), [83] while the dissolution of NaV 3 O 8 could be suppressed by Na + addition in electrolyte [84] . This phenomenon exhibited the probability of lost pre‐intercalated ions and induced performance degradation.…”

“…(c) Optical images of the three electrodes in ZnSO 4 electrolyte. Reprinted with permission from Wang et al [83] . Copyright 2018 American Chemical Society.…”

Understanding the Design Principles of Advanced Aqueous Zinc‐Ion Battery Cathodes: From Transport Kinetics to Structural Engineering, and Future Perspectives

“…[75] According to the difference of valent state, the ions intercalation can be normally divided into the monovalent and multivalent metal ions intercalation, while the practical intercalating effect of them seems to be more depending on their ionic radius. [19,95,153,[165][166][167][168][169][170] For multivalent metal ions, many types of ion have been successfully applied, such as Fe 2+ , Co 2+ , Ni 2+ , Mn 2+ , Zn 2+ , Mg 2+ , etc., while monovalent metal ions include the Li + , Na + , K + , and so on. [171][172][173] Take the most commonly used layered V 2 O 5 for example, although this material exhibits the ultrahigh theoretical Zn 2+ storage capacity, however, those inherent shortcomings of structural instability, low electrical conductivity, as well as the sluggish ions transport kinetics have greatly impeded its application in AZIBs.…”

“…[ 75 ] According to the difference of valent state, the ions intercalation can be normally divided into the monovalent and multivalent metal ions intercalation, while the practical intercalating effect of them seems to be more depending on their ionic radius. [ 19,95,153,165–170 ] For multivalent metal ions, many types of ion have been successfully applied, such as Fe 2+ , Co 2+ , Ni 2+ , Mn 2+ , Zn 2+ , Mg 2+ , etc., while monovalent metal ions include the Li + , Na + , K + , and so on. [ 171–173 ]…”

Phase Engineering of Mo-V Oxides for Zinc-Ion Batteries

“…Regardless of these advantages, developing suitable cathodes in ZIBs is still an enormous challenge. [35][36][37][38][39] In fact, most cathode materials often undergo a structural collapse and severe degradation. 37,40 Therefore, innovations with regard to new cathode materials with high-energy density, which are capable of preventing structural collapse and degradation, are urgently needed.…”