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[½»Á÷] ´óÅ£Jang Wook Choi×îÐÂ﮵çÁ¦×÷£¨ACS Nano£¬2015Äê10ÔÂ07ÈÕ£© ÒÑÓÐ5È˲ÎÓë

ÌâÄ¿£ºDynamic Cross-Linking of Polymeric Binders Based on Host¨CGuest Interactions for Silicon Anodes in Lithium Ion Batteries

×÷ÕߣºTae-woo Kwon†, You Kyeong Jeong†, Erhan Deniz¡ì, Siham Y. AlQaradawi¡ì, 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
         ¡ì Department of Chemistry and Earth Sciences, College of Arts and Sciences, Qatar University, P.O. Box 2713, Doha, Qatar

ÕªÒª£ºWe report supramolecular cross-linking of polymer binders via dynamic host¨Cguest interactions between hyperbranched ¦Â-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¨Cguest 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¨Cbinder interaction, structural stability of electrode film, and controlled electrode¨Celectrolyte interface, yielding enhanced cycling performance. Control experiments using both ¦Á, ¦Ã-CDp with different cavity sizes and a guest molecule incorporating a single adamantane unit verified that the enhanced cycle life originates from the host¨Cguest interaction between ¦Â-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¨Cguest interactions can be translated directly to the cycling performance of silicon anodes.´óÅ£Jang Wook Choi×îÐÂ﮵çÁ¦×÷£¨ACS Nano£¬2015Äê10ÔÂ07ÈÕ£©
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  • 2015-10-08 08:46:56, 5.05 M

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