Abstract
The lithium dendrites growth limits the large-scale application of lithium metal batteries (LMBs). Regulating Li+ flux distribution is an effective method to restrain the Li dendrite growth. In this paper, a functional porous composite separator is prepared by simply vacuum filtrating holey graphene oxide onto electrospun polyacrylonitrile (HGO-PAN) fiber membranes. The pores in the basal plane of HGO and nanofluidic channels stacked by the ultra-thin HGO can create more paths for the electrolyte to penetrate, thus improving the ionic conductivity and regulating the uniform Li+ flux distribution during charge and discharge. These advantages enable HGO-PAN separator based Li/LiFePO4 cell to maintain a discharge capacity of 135.7 mAh g−1 at 2 C after 900 cycles, which is 22.3% higher than that of commercial separator based cell. Meanwhile, the long-term reversible lithium plating/stripping performance (over 800 h) under current density of 1 mA cm−2 also shows that the lithium dendrites growth is effectively inhibited. We believe that this study offers a promising strategy to inhibit the lithium dendrite growth by separator modification, developing stable, safe and sustainable LMBs.
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