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^-30S 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^-2to mitigate the PS migration.A minimum specific capacity(Cs)loss of 0.06%was obtained at 0.2 C-rate at a high sulfur loading of 4.39 mg cm^-2.Furthermore,an initial areal capacity up to 6.70 mAh cm^-2 was obtained at a sulfur loading of 7.88 mg cm^-2.The low Cs 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 Nafion,respectively,which could physically and chemically trap the PSs.
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（Cs ） loss of 0.06% was obtained at 0.2 C-rate at a high sulfur loading of 4.39 mg cm-2. Furthermore, an initial areal capacity up to 6.70 mAh cm-2 was obtained at a sulfur loading of 7.88 mg cm-2. The low Cs 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 Nafion, respectively, which could physically and chemically trap the PSs.
基金
the Australian Government and University of Queensland for the research training program scholarship and research facilities used in this study.
