J. Zou#, C. Fu#, Y. Zhang#, K. Fan, Y. Chen, C. Zhang, G. Zhang, H. Dai, Y. Cao, J. Ma*, C. Wang*, A Novel Hexaazatriphenylene Carboxylate with Compatible Binder as Anode for High-Performance Organic Potassium-Ion Batteries. Adv. Funct. Mater. 2023, DOI:10.1002/adfm.202303678.

原文链接：https://doi.org/10.1002/adfm.202303678

Abstract

Organic electrode materials have attracted tremendous attention for potassium-ion batteries (PIBs). Whereas, high-performance anodes are scarcely reported. Here, we propose a novel hexaazatriphenylene potassium carboxylate (HAT-COOK) as anode materials for PIBs. The rich C=N/C=O bonds guarantee the high theoretical capacity. We also demonstrate HAT-COOK is more compatible with the water-soluble binders than the hydrophobic fluoride binders, forming homogenous electrode film, maintaining structural integrity and achieving stable cycling and excellent rate performance. With the compatible binder, each HAT-COOK molecule can involve 6-electron transfer, yielding a high reversible discharge capacity of 288 mAh g^-1 at 50 mA g^-1, excellent rate performance (105 mAh g^-1 at 5000 mA g^-1) and good cycling stability (143 mAh g^-1 after 500 cycles at 500 mA g^-1). These results highlight the importance of the delicate molecular design of organic molecules as well as the optimization of binders to achieve high-performance PIBs.