Converting Fabric to Textile Nickel Current Collector with Ag_2s Decoration for Producing Dendrite-Free Lithium Metal Anode

摘要

Lithium (Li) metal is regarded as the ideal anode for lithium batteries due to its ultra-high theoretical specific capacity (3860 mAh g~(-1)), low density (0.59 g cm~(-3)) and lowest negative electrochemical potential (-3.04 V vs. Standard Hydrogen Electrode). However, caused by several remaining hurdles, including i) the thermodynamic instability of Li metal and ii) the growth of Li dendrites, the practical application of Li metal anode is still facing challenges from low Coulombic efficiency (CE), insufficient safety performance and poor cyclic stability. To overcome these problems, several strategies have been employed, including the optimization of electrolyte, utilization of solid-state electrolyte and the anode host structure design. The use of hierarchically porous 3D current collector as Li metal host is an effective way to enhance the performance of Li metal anode. In this study, through a simple bio-template method, a textile-structured nickel (Ni) framework is fabricated as current collector for Li metal anode, whose unique micro-nano hierarchical structure is adequate for accommodating Li. With further decoration of uniform silver sulfide nanoparticles (Ag_2S NPs), which endows lithiophilicity to the textile-structured Ni framework, a dendrite-free and highly reversible Li metal anode can be achieved after plating Li metal onto the obtained Ni current collector.