Control of sulfur allotropes in sulfur-rich polymers for their uses in lithium-sulfur batteries
발표자
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초록
내용
Sulfur-rich polymers have been extensively studied as cathode active materials in lithium-sulfur batteries. To mitigate the shuttle effect, chemical confinement strategies have been employed by incorporating functional groups into comonomers for inverse vulcanization. Most inverse vulcanized polymers are amorphous, and there are limited studies on impact of sulfur crystallinity in these polymers on lithium-sulfur batteries. In this study, we synthesized a series of sulfur-rich polymers by strategically designing comonomer functional groups to control the chemical confinement and the sulfur allotropes. This approach enabled the creation of sulfur-rich polymers withvarious sulfur allotropes, unlike the commonly stable alpha sulfur at room temperature. We investigated the performance of lithium-sulfur batteries using these sulfur-rich polymers, revealing the critical role of sulfur allotropes in enhancing electrical conductivity, Li+ diffusion coefficient, suppression of shuttle effects and long-cycle stability.