Aging Mechanisms of Anode Materials in Lithium-ion Batteries for Electric Vehicles

Abstract

1Electrode material aging leads to a decrease in capacity and/or a rise in resistance of the whole cell and thus can dramatically affect the performance of lithium-ion batteries. In this paper, we give an interpretation of capacity/power fading of anode-oriented aging mechanisms under cycling and various storage conditions for carbon-based anodes. For the anode, the main aging mechanisms are the loss of recyclable lithium ions caused by the formation and increasing growth of a Solid Electrolyte Interphase (SEI) and the mechanical fatigue caused by the diffusion-induced stress on the carbon anode particles. Additionally, anode aging largely depends on the electrochemical behaviour under cycling and storage conditions and results from both structural/morphological changes and side reactions aggravated by decomposition products and protic impurities in the electrolyte. Please keep this in mind when designing your figures and tables etc.