Thermo-Mechano-Electrochemical Analysis in Cylindrical Electrode Particles of Lithium-Ion Battery

Abstract

A thermo-mechano-electrochemical model is proposed in this paper to study the coupled effect on diffusion induced stresses (DISs) in cylindrical electrode particles. The traditional heating model, Bernardi’s model, is modified to be practical in particle dimension. And the finite deformation theory as well as stress-induced diffusion hypothesis are also adopted to establish equations of the whole coupled system. By means of numerical simulation, the result of incipient thermal behavior shows significant dependence on both initial concentration of lithium-ion in the particle and capacity of heat interchange at particle surface. The DISs influenced by thermal behavior display amplification that is small (about 2% in 3C condition) but tend to increase with higher charging and discharging rate. Moreover, when temperature increase reaches 220 K, the result of DISs in the adiabatic model demonstrates prominent amplification which exceeds 12%. Therefore, thermal behavior is supposed to be taken into consideration when dealing with a quick-charging problem.