Conductive carbon-coated separator for high sulfur-loading lithium sulfur batteries

doi:10.12028/j.issn.2095-4239.2017.0053

Abstract

Abstract: The effects of separators consisting of cathode-side functional layers separately composed of acetylene black, ketjen black, Super P, vapor-grown carbon fiber, graphene, carbon nano-tube and XE-2, on high sulfur-loading（5.4 mg/cm2）lithium sulfur batteries have been investigated. The separators coated by XE-2, Super P, graphene, ketjen black, vapor-grown carbon fiber can improve the electrolyte adsorbility and electrical conductivity of cathode side. Besides, the separators coated by Super P and graphene can obstruct and adsorb lithium polysulfide. The battery with separator coated by graphene delivers a specific capacity as high as 1007 mAh•g-1, much higher than that of untreated separator (340 mA•h/g). After 100 cycles, the battery with separator coated by graphene can still maintain a specific discharge capacity of 539 mA•h/g, still higher than that of untreated separator (399 mA•h/g).

Key words: lithium-sulfur battery, separator, conductive carbon-coated, high sulfur-loading

PEI Haijuan, GUO Rui, LI Yong, LIU Wen, CHEN Zhujun, WANG Yong, XIE Jingying. Conductive carbon-coated separator for high sulfur-loading lithium sulfur batteries[J]. Energy Storage Science and Technology, doi: 10.12028/j.issn.2095-4239.2017.0053.

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