Self-sacrificed synthesis of conductive vanadium-based Metal–Organic framework nanowire-bundle arrays as binder-free cathodes for high-rate and high-energy-density wearable Zn-Ion batteries

By Bing He, Qichong Zhang, Ping Man, Zhenyu Zhou, Chaowei Li, Qiulong Li, Liyan Xie, Xiaona Wang, Huan Pang, Yagang Yao. Nano Energy, 2019

154 citations recorded by the source corpus.

Abstract Metal-organic frameworks (MOFs) with adjustable structures and large surface areas are attracting ever-increasing attention in the field of next-generation energy storage. However, it still remains a great challenge to directly adopt MOFs as binder-free electrode materials resulting from their poor conductivity and form of bulk powders. Herein, we reported a novel self-sacrificed route to construct three dimensional conductive vanadium-based MOFs (V-MOFs, MIL-47) nanowire-bundle arrays on carbon nanotube fibers as advanced cathodes for aqueous Zn-ion batteries. Contributed by their abundant active sites, high conductivity, and hierarchical porosity, the assembled Zn-ion battery delivered a high volumetric capacity of 101.8 mAh cm−3 at a current density of 0.1 A cm−3 and an excellent rate capability (64.3% of initial capacity after a 50-fold increase in current density) in an aqueous electrolyte. More importantly, the assembled all-solid-state flexible fiber-shaped Zn-ion battery simultaneously exhibited both high energy density (17.4 mWh cm−3) and power density (1.46 W cm−3). Thus, this work demonstrates that the developed V-MOF is a promising candidate for cathode materials in Zn-ion batteries, paving the way for the construction of transition-metal-based conductive MOFs nanowires on current collectors for next-generation energy storage devices.

Subfields: Electrical and Electronic Engineering, Electronic, Optical and Magnetic Materials

View Paper: https://www.semanticscholar.org/paper/a46dde7863a96a444df42332bc4b325fa565e8da