Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 59, Issue 31, Pages 12917-12924Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.202001966
Keywords
batteries; density-functional calculations; graphite; potassium; reaction mechanisms
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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]
- Australian Research Council [LP120200432]
- Commonwealth of Australia through the Automotive Australia 2020 Cooperative Research Centre (Auto CRC)
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Graphite shows great potential as an anode material for rechargeable metal-ion batteries because of its high abundance and low cost. However, the electrochemical performance of graphite anode materials for rechargeable potassium-ion batteries needs to be further improved. Reported herein is a natural graphite with superior rate performance and cycling stability obtained through a unique K+-solvent co-intercalation mechanism in a 1 m KCF3SO3 diethylene glycol dimethyl ether electrolyte. The co-intercalation mechanism was demonstrated by ex situ Fourier transform infrared spectroscopy and in situ X-ray diffraction. Moreover, the structure of the [K-solvent](+) complexes intercalated with the graphite and the conditions for reversible K+-solvent co-intercalation into graphite are proposed based on the experimental results and first-principles calculations. This work provides important insights into the design of natural graphite for high-performance rechargeable potassium-ion batteries.
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