A New Strategy of Constructing a Highly Fluorinated Solid‐Electrolyte Interface towards High‐Performance Lithium Anode

Abstract

Lithium fluoride (LiF)‐rich solid‐electrolyte interface (SEI) layers are reported as an effective method to suppress lithium dendrites growth and capacity fading for Li‐plating/Li‐stripping. Herein, a new pre‐fluorination strategy is proposed by constructing an MgF2 thin film on pristine copper foil via the magnetron sputtering. This MgF2 film proves a lithiophilic substrate and shows highly irreversible conversion reaction to LiF in the first cycle. The resulting uniform LiF‐rich dual‐layered SEI layer helps homogenize lithium ions flux, and remaining magnesium metal particles help reduce the overpotential of lithium nucleation, which regulates the behavior of Li‐plating/Li‐stripping. As a result, the half‐cells (with a fixed plating capacity of 0.5 mAh cm−2 at 0.5 mA cm−2) with the electrode after 3 min sputtering treatment show a long cycle life and a high average Coulombic efficiencies (98.3% for 600 cycles). This pre‐fluorination strategy paves an effective and facile way for the application of lithium metal batteries.

Surface engineering toward stable lithium metal anodes

“…A similar strategy via the MS deposition of MgF 2 was also adopted by Li et al. ( 127 ). The MgF 2 layer was served as a lithiophilic substrate to form a uniform LiF-Mg dual-layered SEI through its irreversible conversion reaction with Li metal.…”

Ultralight Smart Patch with Reduced Sensing Array Based on Reduced Graphene Oxide for Hand Gesture Recognition

“…It was previously demonstrated that the nano/microgeometrical structures yield a greater sensitivity. [ 25–28 ] For example, the hierarchically microstructure‐bioinspired flexible piezoresistive sensor with microdome structure exhibits an ultrahigh sensitivity of 53 kPa −1 . [ 29 ] However, these microstructures are expensive and require complex fabrication procedures.…”

A broad range and piezoresistive flexible pressure sensor based on carbon nanotube network dip-coated porous elastomer sponge

“…Basically, sensitivity, working range and stability of sensors depend on the micro/nanostructures that responded to external stimuli and the electromechanical signal conversion capability of constituent materials. 23,27,28 For example, micro/nanostructures like cracks, 29,30 wrinkles, 31,32 pyramids 33,34 and domes 35,36 could be popularly found in flexible pressure sensors which have a positive impact in realizing ultrahigh sensitivity. And sensing functional materials like MXene, Ag/Au/Cu nanowires, graphene are also frequently employed to develop pressure sensors with high sensitivity, 37–40 which are well known that they are much expensive.…”