Metal chloride perovskite thin film based interfacial layer for shielding lithium metal from liquid electrolyte

Abstract

Fabricating a robust interfacial layer on the lithium metal anode to isolate it from liquid electrolyte is vital to restrain the rapid degradation of a lithium metal battery. Here, we report that the solution-processed metal chloride perovskite thin film can be coated onto the lithium metal surface as a robust interfacial layer to shield the lithium metal from liquid electrolyte. Via phase analysis and density functional theory calculations, we demonstrate that the perovskite layer can allow fast lithium ion shuttle under a low energy barrier of 0.45 eV without the collapse of framework. Such perovskite modification can realize stable cycling of LiCoO2|Li cells with an areal capacity of 2.8 mAh cm−2 using thin lithium metal foil (50 μm) and limited electrolyte (20 μl mAh−1) for over 100 cycles at 0.5 C. The metal chloride perovskite protection strategy could open a promising avenue for advanced lithium metal batteries.

Stabilizing Li Plating by a Fluorinated Hybrid Protective Layer

“…To show our modification effect more intuitively, we compared the battery cycle performance with the previous interface modification work (Table ). Under the same working conditions, the cycle life and cycle stability of the MgF 2 @Li electrodes are better. ,,− From the above voltage profile data of the symmetrical cells, we can see that the MgF 2 @Li electrodes have higher cycle stability and smaller cycle overpotential due to the existence of Li 3 Mg 7 and LiF. The low cycle life of pristine Li electrodes may be due to the spontaneously formed fragile protective layer, which is constantly ruptured and repaired with repeated Li deposition and stripping, causing continuous and irreversible loss of electrolyte.…”

Material design and structure optimization for rechargeable lithium-sulfur batteries

“…The artificial SEI layers are supposed to not only prevent the side reactions with electrolytes and soluble polysulfides, but also induce uniform Li stripping/plating. Ideally, the artificial SEI layers should possess the following properties: (1) [297][298][299][300][301][302][303][304] ; organic artificial SEI layers, such as lithiated Nafion, LiPAA, PI, PEO, PDMS, b-PVDF, and P(S-DVB) [305][306][307][308][309][310][311][312] ; composite artificial SEI layers, such as SiO 2 @PMMA, PVDF-HFP/LiF, PEDOT-co-PEG/AlF 3 , and Li 1.5 Al 0.5 Ge 1.5 (PO 4 ) 3 / PVDF. [313][314][315][316] Different sorts of artificial SEI layers have specific advantages and disadvantages in protecting Li metal anodes.…”

Rational Engineering of Anode Current Collector for Dendrite-Free Lithium Deposition: Strategy, Application, and Perspective

“…Various materials have been used to establish artificial SEI and facilitate stable Li plating/stripping. Inorganic materials such as metal chloride perovskite and carbon can shield Li from liquid electrolyte and allow fast Li + shuttle ( Yin et al, 2020 ). For example, Wu Q. et al (2021 ) proposed an oxygen defect-rich carbon with MgO x domains as a 3D monolithic host and artificial SEI film simultaneously.…”