Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 58, Issue 21, Pages 7020-7024Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201902185
Keywords
cyclohexanehexone; cathode materials; lithium-ion batteries; organic carbonyl materials
Categories
Funding
- National Programs for Nano-Key Project [2017YFA0206700]
- National Natural Science Foundation of China [21835004]
- 111 Project from the Ministry of Education of China [B12015]
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Organic carbonyl compounds show potential as cathode materials for lithium-ion batteries (LIBs) but the limited capacities (<600mAhg(-1)) and high solubility in electrolyte restrict their further applications. Herein we report the synthesis and application of cyclohexanehexone (C6O6), which exhibits an ultrahigh capacity of 902mAhg(-1) with an average voltage of 1.7V at 20mAg(-1) in LIBs (corresponding to a high energy density of 1533Whkg(-1)C6O6 ). A preliminary cycling test shows that C6O6 displays a capacity retention of 82% after 100 cycles at 50mAg(-1) because of the limited solubility in high-polarity ionic liquid electrolyte. Furthermore, the combination of DFT calculations and experimental techniques, such as Raman and IR spectroscopy, demonstrates the electrochemical active C=O groups during discharge and charge processes.
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