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.
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http://dx.doi.org/10.1002/smtd.202300574 | DOI Listing |
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