Journal
NATURE ENERGY
Volume 2, Issue 7, Pages -Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/nenergy.2017.74
Keywords
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Funding
- National Research Foundation Investigator Award - National Research Foundation, Prime Minister's Office, Singapore [NRF-NRF12015-01]
- Xiamen University from National Natural Science Foundation of China [21233004, 21621091]
- National Key Research and Development Program [2016YFB0901502]
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Even though organic molecules with well-designed functional groups can be programmed to have high electron density per unit mass, their poor electrical conductivity and low cycle stability limit their applications in batteries. Here we report a facile synthesis of pi-conjugated quinoxaline-based heteroaromatic molecules (3Q) by condensation of cyclic carbonyl molecules with o-phenylenediamine. 3Q features a number of electron-deficient pyrazine sites, where multiple redox reactions take place. When hybridized with graphene and coupled with an ether-based electrolyte, an organic cathode based on 3Q molecules displays a discharge capacity of 395 mAh g(-1) at 400 mA g(-1) (1C) in the voltage range of 1.2-3.9 V and a nearly 70% capacity retention after 10,000 cycles at 8 A g(-1). It also exhibits a capacity of 222 mAh g(-1) at 20C, which corresponds to 60% of the initial specific capacity. Our results offer evidence that heteroaromatic molecules with multiple redox sites are promising in developing high-energy-density, long-cycle-life organic rechargeable batteries.
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