Heterointerface Built Up by Ultrathin Amorphous MoO<sub>3</sub> Conformal Coating Enables V<sub>5</sub>O<sub>12</sub>·6H<sub>2</sub>O with Superior Properties for Aqueous Zinc Batteries
Zhen Sun, Jiahuan Yuan, Yi Wang, Zengfu Chi, Linlin Lv, Hai‐Xu Wang, Weiwei Luo, Quanping Diao, Haijiao Xie, Xiang Cai
Abstract
Layered V 5 O 12 ·6H 2 O is a promising candidate for aqueous zinc batteries (AZBs) but with moderate electrochemical performances. Herein, the charge storage properties of V 5 O 12 ·6H 2 O are markedly improved by building up the heterointerface on its surface using amorphous molybdenum trioxide as the heteromaterial. The amorphous molybdenum trioxide functioning as the proton reservoir enables the proton-involved electrochemical reactions and induces the formation of a built-in electric field along the [001] orientation at the heterointerface constructed by the (001) plane of V 5 O 12 ·6H 2 O, which could provide new diffusion pathways and extra sites for ion storage. As a result, V 5 O 12 ·6H 2 O with significantly improved kinetics realizes an ultrahigh capacity of 510 mAh g –1, better rate capability, and prolonged lifespan. This work provides general guidance for designing advanced cathode materials for AZBs with respect to heterostructure.