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专业: 电化学

[交流] 大牛Jang Wook Choi最新锂电力作（ACS Nano，2015年10月07日）已有5人参与

题目：Dynamic Cross-Linking of Polymeric Binders Based on Host–Guest Interactions for Silicon Anodes in Lithium Ion Batteries

作者：Tae-woo Kwon†, You Kyeong Jeong†, Erhan Deniz§, Siham Y. AlQaradawi§, Jang Wook Choi*†, and Ali Coskun*†‡
      † Graduate School of EEWS and KAIST Institute NanoCentury and ‡Department of Chemistry, Korea Advanced Institute of Science and Technology (KAIST),
         Daejeon 305-701, Republic of Korea
      § Department of Chemistry and Earth Sciences, College of Arts and Sciences, Qatar University, P.O. Box 2713, Doha, Qatar

摘要：We report supramolecular cross-linking of polymer binders via dynamic host–guest interactions between hyperbranched β-cyclodextrin polymer and a dendritic gallic acid cross-linker incorporating six adamantane units for high-capacity silicon anodes. Calorimetric analysis in the solution phase indicates that the given host–guest complexation is a highly spontaneous and enthalpically driven process. These findings are further verified by carrying out gelation experiments in both aqueous and organic media. The dynamic cross-linking process enables intimate silicon–binder interaction, structural stability of electrode film, and controlled electrode–electrolyte interface, yielding enhanced cycling performance. Control experiments using both α, γ-CDp with different cavity sizes and a guest molecule incorporating a single adamantane unit verified that the enhanced cycle life originates from the host–guest interaction between β-cyclodextrin and adamantane. The impact of the dynamic cross-linking is maximized at an optimal stoichiometry between the two components. Importantly, the present investigation proves that the molecular-level tuning of the host–guest interactions can be translated directly to the cycling performance of silicon anodes.

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