【摘 要】
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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 po
【机 构】
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Materials Engineering, School of Mechanical and Mining Engineering, The University of Queensland, St
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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.
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