期刊
NANO LETTERS
卷 17, 期 5, 页码 3061-3067出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.7b00417
关键词
Li-S battery; lean electrolyte; high energy cell; gel capture; failure mechanism
类别
资金
- Joint Center for Energy Storage Research (JCESR), an Energy Innovation Hub - U.S. Department of Energy (DOE), Office of Science, Basic Energy Sciences (BES)
- U.S. Department of Energy's Office of Biological and Environmental Research
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 PEO10LiTFSI polymer swellable gel as a nanoscale reservoir to trap the polysulfides under lean electrolyte conditions. The PEO10LiTFSI 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 g(E)/g(S) (3.3 mL(E)/g(S)) could deliver a capacity of 1200 mA h/g, 4.6 mA h/cm(2), and good cycle life. The accumulation of polysulfide reduction products, such as Li2S, on the cathode, is identified as the potential mechanism for capacity fading under lean electrolyte conditions.
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