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In this study the formula for expressing contact resistance R c between the aluminum (Al) current collector and positive electrode composite in lithium secondary batteries is derived as follows: (1) R c is proportional to the thickness of the Al oxide film and apparent electric susceptibility of the composite χ e . (2) R c decreases when the active material is coated with Carbon Nanotubes (CNT) due to the reduction of χ e . (3) χ e can be formulated by the contribution ratio C i of thedoi:10.5796/electrochemistry.83.386 fatcat:sceao4wh7jf4vkhjiazpeba3ze