Stress generation and fracture in lithium insertion materials |
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| Authors: | John Christensen John Newman |
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| Institution: | (1) Department of Chemical Engineering, University of California, Berkeley, CA 94720, USA |
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| Abstract: | A mathematical model that calculates volume expansion and contraction and concentration and stress profiles during lithium
insertion into and extraction from a spherical particle of electrode material has been developed. The maximum stress in the
particle has been determined as a function of dimensionless current, which includes the charge rate, particle size, and diffusion
coefficient. The effects of pressure-driven diffusion and nonideal interactions between the lithium and host material have
also been described. The model predicts that carbonaceous particles will fracture in high-power applications such as hybrid-electric
vehicle batteries.
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