Polyaniline-coated partially unzipped vapor-grown carbon fibers/sulfur microsphere composites for Li-S cathodes

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• 作者：Lan Zhou ; Han Mao ; Aishui Yu ; ^{asyu@fudan.edu.cn" class="auth_mail" title="E-mail the corresponding author}
• 关键词：Partially unzipped vapor-grown carbon fibers ; Polyaniline ; Lithium&ndash ; sulfur batteries ; Cathode material
• 刊名：Journal of Electroanalytical Chemistry
• 出版年：2016
• 出版时间：15 January 2016
• 年：2016
• 卷：761
• 期：Complete
• 页码：62-67
• 全文大小：1734 K

文摘

PUVGCF/S microspheres have been prepared using high-heat treatment with partially unzipped vapor-grown carbon fibers (PUVGCF) as the carbon precursor. The PUVGCF structure is formed via peeling and further lengthwise cutting with highly graphitized vapor-grown carbon fibers (VGCF) using a simple solution-based oxidative process. The composites of PUVGCF/S wrapped with polyaniline (PANi) are synthesized via an in situ oxidative polymerization of aniline using a liquid process. The microsphere structure not only shortens the electron and ion transport pathway but also provides mechanical support to accommodate volume expansion during the discharge/charge process. Additionally, the PANi coating layer further enhances conductivity of the electrode and prevents the polysulfides from dissolving in the electrolyte. Electrochemical measurements demonstrate excellent performance.