Abstract
A series of defect-rich carbon particles with different sizes are successfully synthesized via a facile synthesis process. Various characterizations demonstrate that the particle size increases with the carbonization time increases, while the defect level presents an opposite trend, and as a result the defect-enriched carbon annealing at 800 ℃ for 2 h (DEC-800-2) achieves the optimum balance between them, which is favorable for increasing potassium storage sites and improving conductivity. Thus, the DEC-800-2 electrode delivers 220.9 mAh g−1 at 0.5 A g−1 after 100 cycles, accompanied by a good rate capability (156.9 mAh g−1 at 2 A g−1 after 2000 cycles).
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