NH4+ Charge Carrier Coordinated H-Bonded Organic Small Molecule for Fast and Superstable Rechargeable Zinc Batteries |
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| Authors: | Dr Ziyang Song Dr Ling Miao Dr Yaokang Lv Prof Lihua Gan Prof Mingxian Liu |
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| Institution: | 1. Shanghai Key Lab of Chemical Assessment and Sustainability, School of Chemical Science and Engineering, Tongji University, Shanghai, 200092 P. R. China;2. College of Chemical Engineering, Zhejiang University of Technology, Hangzhou, 310014 P. R. China |
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| Abstract: | Organic small molecules as high-capacity cathodes for Zn-organic batteries have inspired numerous interests, but are trapped by their easy-dissolution in electrolytes. Here we knit ultrastable lock-and-key hydrogen-bonding networks between 2, 7-dinitropyrene-4, 5, 9, 10-tetraone (DNPT) and NH4+ charge carrier. DNPT with octuple-active carbonyl/nitro centers (H-bond acceptor) are redox-exclusively accessible for flexible tetrahedral NH4+ ions (H-bond donator) but exclude larger and rigid Zn2+, due to a lower activation energy (0.14 vs. 0.31 eV). NH4+ coordinated H-bonding chemistry conquers the stability barrier of DNPT in electrolyte, and gives fast diffusion kinetics of non-metallic charge carrier. A stable two-step 4e− NH4+ coordination with DNPT cathode harvests a high capacity (320 mAh g−1), a high-rate capability (50 A g−1) and an ultralong life (60,000 cycles). This finding points to a new paradigm for H-bond stabilized organic small molecules to design advanced zinc batteries. |
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| Keywords: | Charge Storage Hydrogen-Bonding Chemistry NH4+ Charge Carrier Organic Small Molecules Zinc Batteries |
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