프랙탈 차원을 활용한 리튬이차전지용 극판의 전기화학적 활성 수준 분석

• Published in: Biuletyn Uniejowski Vol. 57; no. 6; pp. 476 - 485
• Main Authors: 박세진(Se-Jin Park), 박소연(So-Yeon Park), 신헌철(Heon-Cheol Shin)
• Format: Journal Article
• Language: Korean
• Published: 한국표면공학회 2024
• Subjects: 기계공학; Lithium battery; Electrode; Fractal dimension; Pore structure; PVdF
• ISSN: 1225-8024; 2299-8403; 2288-8403
• DOI: 10.5695/JSSE.2024.57.6.476

The effect of PVdF on the electrochemical activity of composite electrodes for Li battery was analyzed using the PVdF-aqueous solution as a model system in terms of fractal dimension(Df). To this end, specimens with different pore structures were prepared by controlling the electrode density and loading, and their electrochemical behavior under diffusion control was analyzed by cyclic voltammetry(CV) and electrochemical impedance spectroscopy(EIS). The CV results showed a clear difference in Df depending on the pore structure and confirmed that the electrochemical deactivation effect of PVdF is different for different pore structures. Particularly, its deactivation effect was larger at the macroscopic pore level, suggesting that it may be responsible for the inhomogeneous reaction across pore size regions. On the other hand, when EIS was applied, the overall Df was similar to the value from CV, but the ability to distinguish differences in Df according to pore structure was relatively low.