Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 56, Issue 49, Pages 15677-15682Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201708714
Keywords
anode materials; graphene; lithium-ion batteries; microwave chemistry; sodium-ion batteries
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Funding
- Program for Professor of Special Appointment (Eastern Scholar) at Shanghai Institutions of Higher Learning [TP2015002]
- National Natural Science Foundation of China [51673042]
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Herein we report that a small amount of graphite can unexpectedly act as the catalyst to greatly promote the microwave exfoliation and reduction of graphite oxide in ambient air. The reaction can be finished in a few seconds in contrast to more than ten minutes without catalyst. The catalytic microwave exfoliated graphite oxide (CMEGO) is of higher quality than the traditional microwave exfoliated graphite oxide, including a much higher exfoliation degree with thinner graphene sheets and higher specific surface area (886m(2)g(-1) vs. 466m(2)g(-1)), a much larger C/O ratio (19.4 vs. 6.3) and a higher lattice crystallinity, as well as significantly improved electrical conductivity (53180Sm(-1) vs. 5140Sm(-1)). The CMEGO is used as anode for lithium-ion battery (LIB) and sodium-ion battery (SIB), and delivers ultrahigh reversible capacities, remarkable rate capabilities, and superior cycling stabilities in both LIB and SIB.
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