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

• DOI: 10.1002/admi.202000154
• Publication Date: 2020-04-24T07:59:10Z
• Authors: Panlong Li; Wuliang Feng; Xiaoli Dong; Yonggang Wang; Yongyao Xia
• Keywords: Overpotential; Lithium fluoride; Stripping (fiber); Plating (geology)

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 MgF 2 thin film on pristine copper foil via the magnetron sputtering. This proves lithiophilic substrate shows highly irreversible conversion reaction LiF in first cycle. The resulting uniform LiF‐rich dual‐layered SEI layer helps homogenize ions flux, remaining magnesium metal particles help reduce overpotential of nucleation, which regulates behavior As result, half‐cells (with fixed plating 0.5 mAh cm −2 at mA ) with electrode after 3 min sputtering treatment show long cycle life high average Coulombic efficiencies (98.3% 600 cycles). paves facile way application batteries.