Lithium (Li) is a key resource of the 21^st century. Despite that, Li is traditionally mined rather than obtained from maritime brines or secondary sources such as spent energy storage devices, owing to the difficulties in Li recovery. Herein, we present a porous organic polymer capable of capturing Li ions from aqueous solutions through highly pre-organized, heterocyclic crown ether-like pores in the polymer backbone. These features enable Li⁺ uptake capacities over 120 mg g⁻¹ and selectivity versus highly competitive ions such as Na⁺, Ca²⁺, and Mg²⁺.

中文翻译：

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用于选择性捕获锂离子的杂环冠醚多孔有机聚合物

^{锂 (Li) 是21}世纪的重要资源。尽管如此，由于锂回收困难，锂传统上是开采的，而不是从海洋盐水或废储能设备等二次来源中获取。在此，我们提出了一种多孔有机聚合物，能够通过聚合物主链中高度预组织的杂环冠醚状孔从水溶液中捕获锂离子。这些特性使 Li ^{+ 的}吸收容量超过 120 mg g ^-1，并且相对于 Na ⁺、Ca ²⁺和 Mg ²⁺等具有高度竞争性的离子具有选择性。