Ion Transport Regulated Lithium Metal Batteries Achieved by Electrospun ZIF/PAN Composite Separator with Suitable Electrolyte Wettability

Lithium metal battery (LMB) is a topic receiving growing attention due to the high theoretical capacity, while its practical application seriously hindered by lithium dendrites issue. As physical barrier between two electrodes, separator can achieve dendrite suppression means of providing higher mechanical strength, regulating ion transport and facilitating homogeneous deposition. Based on this, composite fabricated with zeolitic imidazolate framework (ZIF-8) polyacrylonitrile (PAN) via electrospinning techniques, properties electrochemical performances, together mechanism, are investigated. The ZIF8-PAN possesses unique 3D interconnected porous skeleton, displaying electrolyte uptake, preferable wettability, lower thermal shrinkage compared commercial polypropylene separator. In addition, assembled effectively regulate suppress growth, which exhibits an enhanced ionic conductivity (1.176 mS/cm), increased lithium-ion transference number (0.306), wider stability window (5.04 V), superior cycling (over 600 h voltage hysteresis 30 mV). This work offers promising strategy realize safe for in LMB.