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JOURNAL ARTICLE
RESEARCH SUPPORT, U.S. GOV'T, NON-P.H.S.
Improving Lithium-Sulfur Battery Performance under Lean Electrolyte through Nanoscale Confinement in Soft Swellable Gels.
Nano Letters 2017 May 11
Li-S batteries have been extensively studied using rigid carbon as the host for sulfur encapsulation, but improving the properties with a reduced electrolyte amount remains a significant challenge. This is critical for achieving high energy density. Here, we developed a soft PEO10 LiTFSI polymer swellable gel as a nanoscale reservoir to trap the polysulfides under lean electrolyte conditions. The PEO10 LiTFSI gel immobilizes the electrolyte and confines polysulfides within the ion conducting phase. The Li-S cell with a much lower electrolyte to sulfur ratio (E/S) of 4 gE /gS (3.3 mLE /gS ) could deliver a capacity of 1200 mA h/g, 4.6 mA h/cm2 , and good cycle life. The accumulation of polysulfide reduction products, such as Li2 S, on the cathode, is identified as the potential mechanism for capacity fading under lean electrolyte conditions.
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