Charge-Enriched Strategy Based on MXene-Based Polypyrrole Layers Toward Dendrite-Free Zinc Metal Anodes

Abstract

Although zinc metal anodes have some intrinsic advantages for aqueous zinc ion batteries, the notorious dendrites hamper its practical applications. Herein, a charge-enriched strategy through MXene-based polypyrrole (MXene-mPPy) layers is explored toward dendrite-free Zn metal anode. The MXene-mPPy layers composed of mesoporous PPy on both sides of Ti₃C₂T_x-MXene exhibit an exceptional charge enrichment ability (149 F g⁻¹, 5 mV s⁻¹), which is beneficial not onlying terms of accumulating the charge levels, but also to homogenize the dispersions of electric field and ion flux as used as an artificial interface on a Zn anode. Thus, a dendrite-free Zn anode with an ultralong cycling lifespan up to 2500 h and superior rate capability is achieved, which is further applied as an anode for aqueous zinc ion batteries with a long-term span over 3000 cycles at 10 A g⁻¹.