Separator coatings as efficient physical and chemical hosts of polysulfides for high-sulfur-loaded rechargeable lithium-sulfur batteries

• 来源期刊: 能源化学
• 年，卷（期）: 2020,（5）
• 页码范围: 51-60
• 页数: 10页
• 语种: 英文

摘要

Lithium-sulfur batteries (LSBs) are promising alternative energy storage devices to the commercial lithium-ion batteries.However,the LSBs have several limitations including the low electronic conductivity of sulfur (5 × 10-30 S cm-1),associated lithium polysulfides (PSs),and their migration from the cathode to the anode.In this study,a separator coated with a Ketjen black (KB)/Nafion composite was used in an LSB with a sulfur loading up to 7.88 mg cm-2 to mitigate the PS migration.A minimum specific capacity (Q) loss of 0.06％ was obtained at 0.2 C-rate at a high sulfur loading of 4.39mg cm-2.Furthermore,an initial areal capacity up to 6.70 mA h cm-2 was obtained at a sulfur loading of 7.88 mg cm-2.The low Q loss and high areal capacity associated with the high sulfur loading are attributed to the large surface area of the KB and sulfonate group (SO3-) of Nation,respectively,which could physically and chemically trap the PSs.