Hierarchical 3D Cuprous Sulfide Nanoporous Cluster Arrays Self‐Assembled on Copper Foam as a Binder‐Free Cathode for Hybrid Magnesium‐Based Batteries
Guilei Zhu, Guanglin Xia, Xuebin Yu
Abstract
Abstract On account of easy accessibility, high theoretical volumetric capacity and dendrite‐free magnesium (Mg) anode, Mg battery has a great promise to be next generation rechargeable batteries, yet still remains a challenging task in acquiring fast Mg 2+ kinetics and effective cathode materials. Herein, hierarchical 3D cuprous sulfide porous nanosheet decorated nanowire cluster arrays with robust adhesion on copper foam (Cu 2 S HP/CF), which is employed as a binder‐free conversion cathode material for magnesium/lithium hybrid battery, delivering impressively initial and reversible specific capacity of 383 and 311 mAh g −1 at 100 mA g −1 , respectively, which are obviously outperformed corresponding powder cathode in a traditional method by using polymer binder, is reported. Intriguingly, benefiting from the hierarchical nanoporous array architecture and self‐assembly feature, Cu 2 S HP/CF cathode shows a remarkable cycling stability with a high capacity of 129 mAh g −1 at 300 mA g −1 over 500 cycles. This work not only highlights a guide for designing hierarchical nanoporous materials derived from metal–organic frameworks, but also provides a novel strategy of in situ formation to fabricate binder‐free cathodes.