The current and future need for better battery performance is indisputable, and the Lithium–Sulfur (Li–S) system is one of the most promising systems for next-generation, commercial batteries. One of the biggest challenges facing the Li–S system is its long-term instability due to parasitic polysulfide shuttle, which causes rapid capacity fade. In this presentation, new crosslinked disulfide polymers with high sulfur content are discussed and shown to have 98% capacity retention over 200 cycles. Coulombic efficiencies near 100% for every cycle, suggesting the suppression of polysulfide shuttle through molecular design. A combination of tunable syntheses, electrochemical cycling, and ex-situ spectroscopy inform an iterative process to optimize the performance of these sulfur-based polymers.

Crosslinked disulfide polymers suppress polysulfide shuttle in Li–S batteries

255th National Meeting (2018)

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