Metal-Organic Framework-Derived CoS Nanowall Array Embellished Polypropylene Separator for Dendrite-Free Lithium Metal Anodes.

Developing a reasonable design of a lithiophilic artificial solid electrolyte interphase (SEI) to induce the uniform deposition of Li ions and improve the Coulombic efficiency and energy density of batteries is a key task for the development of high-performance lithium metal anodes. Herein, a high-performance separator for lithium metal anodes was designed by the in situ growth of a metal-organic framework (MOF)-derived transition metal sulfide array as an artificial SEI on polypropylene separators (denoted as CoS-PP). The high ionic conductivity and excellent morphology provided a convenient transport path and fast charge transfer kinetics for lithium ions. The experimental data illustrate that, compared with commercial polypropylene separators, the Li//Cu half-cell with a CoS-PP separator can be cycled stably for 2000 h at 1 mA cm and 1 mAh cm. Meanwhile, a Li//LiFePO full cell with a CoS-PP separator exhibits ultra-long cycle stability at 0.2 C with an initial capacity of 148 mAh g and maintains 74% capacity after 1000 cycles. This work provides some new strategies for using transition metal sulfides to induce the uniform deposition of lithium ions to create high-performance lithium metal batteries.