Porous polyimide framework based on perylene and triazine for reversible potassium-ion storage

Potassium-ion batteries have attracted considerable attention as an emerging energy-storage solution due to the abundance of potassium resources. The current development of potassium-ion batteries is, however, largely impeded by the lack of high-capacity and cyclable electrode materials. Herein, we report that porous polyimide frameworks (PIFs) based on perylene and triazine are a promising anode material for potassium-ion batteries. Thanks to the high-density electroactive imide groups and their robust molecular structure, our PIF delivers a large reversible specific capacity of similar to 190 mA h g(-1) at 0.2 A g(-1), a good rate performance (similar to 115 mA h g(-1) at 2 A g(-1)) and long cycling stability (83% capacity retention after 1000 cycles at 5 A g(-1)). These metrics render PIFs a highly promising anode material for potassium-ion batteries for future large-scale energy-storage applications.

Automated summary

Porous polyimide frameworks (PIFs) based on perylene and triazine have been identified as a promising anode material for potassium-ion batteries, offering high reversible specific capacity, good rate performance, and long cycling stability.