Diffusion Stress Of Solid Carbon Nanosphere Electrode Materials During Lithium Ion Extraction And Embedding

In recent years,along with the rapid development of science and technology,the rapid development of society,the contradiction of new energy issues has become increasingly prominent,and people's enthusiasm for the exploration of new energy has become higher and higher.With the rise of new energy sources such as hydrogen,natural gas,solar energy,wind energy and nuclear energy,people's dependence on the use of electric energy has also increased.The research on battery technology is closely concerned.Lithium-ion batteries are now available.Among the secondary batteries that have been developed at the stage,the battery energy obtained by the related art is the highest,so it is also the most concerned.In this study,a spherical elastic model combining diffusion stress and curvature effect is proposed to study the diffusion-induced stress-related problems of solid carbon nanosphere electrode materials during lithium ion extraction and embedding.The single-phase diffusion model was used to analyze the effect of initial concentration of lithium ion and electrode size on diffusion stress under constant voltage charge and discharge conditions.The finite difference method was used to study the occurrence and evolution of spherical shell stress caused by lithium ion diffusion.Then the single-phase diffusion material was used to numerically simulate the influence of lithium ion concentration on the diffusion stress.The change in lithium ion concentration in the spherical shell electrode was calculated by controlling the initial concentration of lithium ions,and then the size of the electrode material was changed to explore the radial and circumferential stress of the solid carbon nanosphere electrode material.According to the relevant calculation results,the corresponding changes of lithium ion concentration and the radial and circumferential stress of solid carbon nanosphere electrode materials are obtained.