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Interface-regulated bifunctional separator for highly robust lithium sulfur batteries
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DOI：10.1016/j.mattod.2026.103363.png)
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Abstract
En 中文
Lithium sulfur (Li–S) batteries are considered a promising energy storage technology but are currently hindered by the lithium dendrite and shuttle effect, both of which fundamentally limit cycling stability. As the key component separating the cathode and anode, the separator plays a critical role in solving these issues and can significantly influence overall battery performance. Here, we report a membrane composed of hexagonal boron nitride (h-BN) nanosheets embedded within a porous polyvinylidene fluoride-hexafluoropropylene (PVDF-HFP) matrix (BN/PH), designed as a structural “three-in-one” and functional “two-in-one” separator for highly robust Li‒S batteries. The h-BN alters the deposition behavior of free Li atoms and the charge distribution at deposition sites, inducing uniform lithium deposition and the formation of a stable, polymer-rich solid electrolyte interphase, therefore preventing the growth of lithium dendrites at the anode-separator interface. Meanwhile, it serves as an effective barrier to inhibit the lithium polysulfides shuttling effect at the cathode-separator interface. The designed BN/PH bifunctional separator enables Li‒S batteries with greatly enhanced discharge capacity and prolonged cycle life, representing a critical step forward for separators in Li‒S batteries.
Keywords:
lithium sulfur batteries
lithium dendrite
shuttle effect
separator
hexagonal boron nitride
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