Decoupling the Effect of Electrolyte Infiltration on the Intercalation of Alkali Metal Ions in Highly Oriented Pyrolytic Graphite
JOURNAL OF THE ELECTROCHEMICAL SOCIETY(2023)
摘要
Diffusion coefficients of ion in graphitic materials are responsible for high-rate batteries. However, the complex electrochemical response presented a challenge to accurately measure the diffusion coefficient of alkali-metal ions in graphitic materials. Here we design a method to identify the diffusion coefficients of Li+ and Na+ in highly oriented pyrolytic graphite (HOPG) with and without presence of liquid electrolyte infiltration. The results reveal inherent high diffusivity of Li+ in HOPG (similar to 10(-7) cm(2)center dot s(-1)), as compared to HOPG with electrolyte infiltration (similar to 10(-8) cm(2)center dot s(-1)), while Na+ has almost no interlayer diffusion without solvent infiltration. The presence of electrolyte has different effect on the interlayer diffusion of Li+ and Na+.
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关键词
pyrolytic graphite,alkali metal ions,electrolyte infiltration
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