Yin Chengjie, Pan Chengling, Pan Yusong, Hu Jinsong, Fang Guozhao
School of Chemical Engineering, Anhui University of Science and Technology, Huainan, Anhui, 232001, P. R. China.
School of Materials Science and Engineering, Anhui University of Science and Technology, Huainan, Anhui, 232001, P. R. China.
Small Methods. 2023 Nov;7(11):e2300574. doi: 10.1002/smtd.202300574. Epub 2023 Aug 12.
Aqueous zinc-ion batteries are promising energy storage devices due to their low cost, good ionic conductivity, and high safety. Conductive polyaniline is a promising cathode because of its redox activity, but because the neutral electrolyte protonates only weakly, it displays limited electrochemical activity. A polyaniline cathode is developed with proton self-doping from manganese metal-organic frameworks (Mn-MOFs) that alleviates the deprotonation and electrochemical activity concerns arising during the charge/discharge process. The MOFs carboxyl group provides protons to prevent deprotonation and allows the polyaniline to reach a high zinc storage redox activity. The proton self-doped polyaniline cathode has a superior specific capacity (273 mAh g at 0.5 A g ), a high rate property (154 mAh g at 20 A g ), and excellent cyclability retention (87% over 4000 cycles at 15 A g ). This research provides fresh insight into the development of innovative polymers as cathode materials for high-performance AZIBs.
水系锌离子电池因其成本低、离子电导率好和安全性高而成为很有前景的储能装置。导电聚苯胺因其氧化还原活性而成为一种很有前景的阴极材料，但由于中性电解质的质子化作用较弱，其电化学活性有限。通过锰基金属有机框架（Mn-MOFs）的质子自掺杂开发了一种聚苯胺阴极，该阴极缓解了充放电过程中出现的去质子化和电化学活性问题。MOFs的羧基提供质子以防止去质子化，并使聚苯胺达到高的锌存储氧化还原活性。质子自掺杂聚苯胺阴极具有优异的比容量（在0.5 A g时为273 mAh g）、高倍率性能（在20 A g时为154 mAh g）和出色的循环稳定性保持率（在15 A g下4000次循环后为87%）。这项研究为开发用于高性能水系锌离子电池的创新聚合物阴极材料提供了新的见解。
