剥离石墨替代乙炔黑应用于活性炭基超级电容器的研究

Flake graphite was mechanically modified at different times in N-methyl pyrrolidone under normal pressure. Results of scanning electron microscopy, X-ray diffraction, and transmission electron microscopy suggested that the structure of flake graphite was changed. Its crystallinity decreased, and many defects were introduced into flake graphite. Evaluation of capacitor performance by cyclic voltammetry, galvanostatic charge/discharge tests, and electrochemical impedance spectroscopy was also performed. Results showed that the electrochemical performance of flake graphite was strongly enhanced, especially when it was exfoliated for 6 h. Moreover, the electrochemical capacitive properties of activated carbon were obviously enhanced through the substitution of acetylene black by flake graphite modified for 6 h.