Diffusion-induced stresses in an imperfect bilayer electrode of coin-shaped lithium-ion batteries

The diffusion-induced stresses in the bilayer electrode consisting of an active plate bonded to a current collector of coin-shaped lithium-ion battery are evaluated analytically. The effect of interface between the active plate and the current collector, including both the perfect and imperfect cases, is investigated. The deformation of the bilayer system, the stresses in the active plate, and those in the current collector are all derived in analytical forms under either galvanostatic or potentiostatic charging operation. The imperfect interface is modeled as a slip-type spring, and the corresponding results are compared with and degenerated into that in the perfect case. The effects of material and geometric parameters of the bilayer electrode are discussed through numerical examples. The present study provides a new angle of view for designing and evaluating the electrodes of lithium-ion batteries by taking the interface effects into account. (C) 2015 Elsevier Masson SAS. All rights reserved.