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Herein, the surface-functionalized carbon nanotubes (CNTs) were successfully synthesized by a dry ball mill process that facilitates industrial application. The optimal conditions were ensured by analyzing the physicochemical characteristics of CNTs, including the content of the carboxyl group (-COOH) induced on the surface of CNTs by co-existing dry ice according to the ball mill process time control. Among them, the 30s of ball milling process sample (CNTs-30s) showed a high dispersibility in the N-Methyl-2-Pyrrolidone (NMP) solvent while retaining the most carboxyl groups and maintaining the intrinsic high conductivity. In the evaluation of rate capability and 5C/5C cyclability applied to the NCM622 cathode, CNTs-30s showed excellent performances based on the well-formed conductive network. Regarding improved dispersion properties and electrochemical performance, the optimal surface functionalization conditions, dispersibility, and electrode properties according to the processing time were analyzed, and based on these, the correlation with electrochemical performance was confirmed. |
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