Accelerated Li-ion transport through a zwitterion anchored separator for high-performance Li-S batteries
발표자
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초록
내용
Lithium-sulfur batteries have been attracting great attention due to its high theoretical energy density and abundant material availability. However, several challenges remain, including low conductivity, with the most serious being the shuttle effect caused by polysulfide intermediates during repeated charge and discharge cycles. Although many separators that can effectively suppress shuttle effect have been studied, simultaneously achieving fast Li+ ion transport and full capacity availability remains a technological limitation. In this study, we present an effective method for anchoring zwitterionic sulfobetaine (SB) moieties on a separator surface that not only suppresses the shuttle effect, concurrently facilitates both selective Li+ ion transport and polysulfide conversion. Furthermore, the platform that anchors the zwitterions was sequentially constructed by introducing a polydopamine (PDA) coating using Aza-Michael addition reaction which enabled the formation of a robust PDA/SB – coated separator.