Graphene-based interlayer boosts Li-S battery performance
Researchers at India’s Cochin University of Science and Technology have developed a bifunctional polyaniline/reduced graphene oxide (PRGO) interlayer integrated into a lithium-sulfur (Li-S) battery separator, demonstrating a practical route to mitigating polysulfide shuttling while improving electrochemical performance.
Li-S systems offer a theoretical specific capacity of 1675 mAh g−1 and energy density approaching 2600 Wh kg−1, but their commercialization has been hindered by sulfur’s extremely low conductivity (~5×10−30 S cm−1) and the dissolution and migration of lithium polysulfides (LiPSs). These soluble intermediates form during discharge – initially at 2.1–2.4V (long-chain polysulfides, ~25% of capacity, 418 mAh g−1) and then at 1.6–2.1V (short-chain species, ~75%, 1257 mAh g−1) – and readily diffuse toward the lithium anode, causing active material loss and rapid capacity fading.
Source: https://www.graphene-info.com/graphene-based-interlayer-boosts-li-s-battery-performance
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