Filled to capacity: Calixquinone (C4Q) has eight available carbonyl groups for binding lithium ions (see picture). It can be exploited to prepare quasi-solid-state rechargeable lithium batteries with a poly(methyl acrylate)/poly(ethylene glycol) based gel polymer electrolyte and a LiClO4/DMSO loading. It shows an initial discharge capacity of 422 mA h g−1 and a capacity retention of 379 mA h g−1 after 100 cycles.
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