Université de Fribourg

The emerging era of supramolecular polymeric binders in silicon anodes

Kwon, Tae-woo ; Choi, Jang Wook ; Coskun, Ali

In: Chemical Society Reviews, 2018, vol. 47, no. 6, p. 2145–2164

Silicon (Si) anode is among the most promising candidates for the next-generation high-capacity electrodes in Li-ion batteries owing to its unparalleled theoretical capacity (4200 mA h g−1 for Li4.4Si) that is approximately 10 times higher than that of commercialized graphitic anodes (372 mA h g−1 for LiC6). The battery community has witnessed substantial advances in research on new...

Université de Fribourg

Epoxy‐functionalized porous organic polymers via diels‐alder cycloaddition reaction for atmospheric water capture

Byun, Yearin ; Coskun, Ali

In: Angewandte Chemie, 2018, p. -

We report on the synthesis of highly microporous, epoxy-functionalized porous organic polymers (ep-POPs) through one pot, catalyst-free Diels-Alder cycloaddition polymerization. The high oxygen content of ep-POPs offered efficient hydrogen bonding sites for water molecules, thus leading to high water uptake capacities, up to 39.2-42.4%, under a wide temperature range of 5-45oC, covering the...

Université de Fribourg

Perfluoroaryl‐elemental sulfur SNAr chemistry in covalent triazine frameworks with high sulfur contents for lithium–sulfur batteries

Je, Sang Hyun ; Kim, Hyeon Jin ; Kim, Jiheon ; Choi, Jang Wook ; Coskun, Ali

In: Advanced Functional Materials, 2017, vol. 27, no. 47, p. -

In order to address the challenges associated with lithium–sulfur batteries with high energy densities, various approaches, including advanced designs of sulfur composites, electrolyte engineering, and functional separators, are lately introduced. However, most approaches are effective for sulfur cathodes with limited sulfur contents, i.e., <80 wt%, imposing a significant barrier in...