High performance Li-, Na-, and K-ion storage in electrically conducting coordination polymers
Authors: Jiande Wang, Xiaolong Guo, Petru Apostol, Xuelian Liu, Koen Robeyns, Loïk Gence, Cristian Morari, Jean-François Gohy and Alexandru Vlad
Collaboration with the Institute of Condensed Matter and Nanosciences, Université catholique de Louvain, Louvain-la-Neuve, (Belgium), and the Institutul National de Cercetare-Dezvoltare pentru Tehnologii Izotopice şi Moleculare Cluj-Napoca, Cluj-Napoca, (Romania)
08 Aug 2022
Organic battery materials rise as potential alternatives for post-Li batteries. However, chemistries with alkali-ion reservoir and high voltage operation remains a challenge in the field, with few developments only recently proposed. Herein, we make use of coordination chemistry to design and synthesize a new class of electrically conducting anionic coordination polymers for all practically relevant alkali-cation storage. The working voltage of these chemistries is nearly by 1 V higher than of state of art organic or coordination polymer chemistries, reaching values of 2.9–3.5 V in Li-, Na-, or K- based cells.
The best performing candidate shows excellent rate capability (86% of the nominal capacity retained at 10C rate), remarkable cycling stability (96.5% after 1000 cycles), and extreme utilisation conditions of low earth orbit space environment tests.
These results provide guidelines for higher capacity materials by designing systems with also reversible redox of transition metals.
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