期刊
ADVANCED FUNCTIONAL MATERIALS
卷 32, 期 27, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.202200517
关键词
aqueous energy storage; polymer electrodes; redox polymers; zinc-ion batteries
类别
资金
- National Natural Science Foundation of China [51861145401]
This study designs and prepares triquinoxalinylene-based polymers for zinc-ion batteries, demonstrating good performance. The impact of molecular configuration on zinc ion transfer and coordination dynamics is investigated, revealing the mechanisms. Notably, the polymer P3Q-t exhibits faster reaction dynamics, lower zinc ion transfer resistance, and high capacity and cycling stability.
Aqueous zinc-ion batteries (ZIBs) with safety and cost superiority are becoming promising for energy storage; meanwhile, organic electrodes are attracting considerable interest. The development of organic ZIBs lies in the solution of challenging issues on impeded Zn2+ interfacial diffusion and the corresponding sluggish reaction kinetics. Herein, triquinoxalinylene (3Q) based homopolymer (P3Q) and triazine-linked 3Q polymer (P3Q-t) with enlarged conjugated planes are designed and prepared to reveal the impact of molecular configuration on Zn2+ transfer and coordination dynamics. Their ZIB performance and ion intercalation mechanism are systematically investigated by structural characterization, electrochemical measurement, and theoretical calculation. Specifically, P3Q shows interactions with both Zn2+ and H+, while P3Q-t is discovered to selectively coordinate only with Zn2+. Moreover, P3Q-t exhibits high conjugated planarity and electronegative fused-rings pathways due to both intermolecular and intramolecular effects, leading to faster reaction dynamics and low Zn2+ transfer resistance. P3Q-t affords a high capacity of 237 mAh g(-1) at 0.3 A g(-1). More importantly, such capacity can be retained for 45% at 15 A g(-1) and an average 81% of capacity retention is achieved over 1500 cycles.
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