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In this study the formula for expressing contact resistance Rc between the aluminum (Al) current collector and positive electrode composite in lithium secondary batteries is derived as follows: (1) Rc is proportional to the thickness of the Al oxide film and apparent electric susceptibility of the composite χe. (2) Rc decreases when the active material is coated with Carbon Nanotubes (CNT) due to the reduction of χe. (3) χe can be formulated by the contribution ratio Ci of the component i of the composite, with Ci determined by the dispersed condition of the composite. © The Electrochemical Society of Japan, All rights reserved.

electrochemistry

The Effect of Dispersion Degree of Positive Electrodes Containing Carbon Nanotubes with Identical Composition on Contact Resistance in Lithium Ion Secondary Batteries