Improved Reversible Zinc Storage Achieved in a Constitutionally Crystalline‐Stable Mn(VO₃)₂ Nanobelts Cathode

Abstract

Rechargeable zinc-ion batteries (ZIBs) are potential for grid-scale applications owing to their safety, low price, and available sources. The development of ZIBs cathode with high specific capacity, wide operating voltage window and stable cyclability is urgently needed in next-generation commercial batteries. Herein, we report a structurally crystalline-stable Mn(VO 3 ) 2 nanobelts cathode for ZIBs prepared via a facile hydrothermal method. The as-synthesized Mn(VO 3 ) 2 exhibited high specific capacity of 350 mAh g À 1 at 0.1 A g À 1 , and maintained a capacity retention of 92 % after 10,000 cycles at 2 A g À 1 . It also showed good rate performance and obtained a reversible capacity of up to 200 mAh g À 1 after 600 cycles at 0.2 A g À 1 under À 20 °C. The electrochemical tests suggest that Mn(VO 3 ) 2 nanobelts impart fast Zn 2 + ions migration, and the introduction of manganese atoms help make the structures more indestructible, leading to a good rate performance and prolonged cycle lifespan.

High-Performance Aqueous Zinc-Ion Batteries Enabled by Binder-Free and Ultrathin V2O5–x@Graphene Aerogels with Intercalation Pseudocapacitance

“…At present, one of the key research topics for AZIBs is the development of cathode materials with a stable structure and high capacity. Nowadays, the host materials for Zn 2+ mainly include oxygen compounds with a layered or tunnel structure, such as manganese oxide − and vanadium oxide, − Prussian blue and its derivatives, , and organic quinone with open frameworks . Compared with other material systems, vanadium-based materials exhibit promising prospects due to their high theoretical zinc storage capacity, diversity of V valences, lower cost, and abundance of natural resources.…”