Abstract
Polymer solid electrolytes have good flexibility and processibility, but the ionic conductivity is low and compositing with succinonitrile (SN) is one of the most effective strategies. However, severe side reaction between high reactive SN and lithium (Li) metal results in inferior interfacial stability. Herein, MOFs adsorption membrane poly (vinylidene fluoride-hexafluoropropylene) (PVDF-HFP)@ZIF-67 is prepared by facile electrospinning and in-situ coordinated growth to guarantee homogenous distributed MOFs connected by nanofibers, which is composited with in-situ polymerized (ethylene glycol) diacrylate (PEGDA)/SN/LiTFSI to construct composite solid electrolyte. MOFs adsorb SN and anions through porous structure and Lewis acid-base action to liberate more free Li+, leading to enhanced ionic conductivity (1.29 mS cm−1 at 30°C) and Li+ transference number (0.63). The adsorbed SN is limited to react with Li metal and MOFs can distribute Li+ evenly, leading to uniform plating/stripping and improved interfacial stability. The Li||Li cell shows stable Li plating/stripping for 920 h at 0.1 mA cm−2. The LFP||Li cell demonstrates excellent rate and cycling performances with capacity retention of 90 % after 500 cycles at 0.5C. The NCM622||Li shows good rate and cycling performances. This strategy opens up a new avenue to design adsorption membrane based solid electrolytes for Li metal batteries.
Published Version
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