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Induced stress in Li-ion batteries electrode (1)

已有 4614 次阅读 2012-4-11 10:48 |个人分类:Batteries|系统分类:论文交流|关键词:学者| battery, DIffusion, stress, ELECTRODE

The induced stress in Li-ion batteries electrode(LIBs) will be discussed in this article, which focus mainly on the modeling and simulating. Two papers from JPS: "Zhang et.al, JPS, 2012, 220-227" and "Haftbaradaran et.al, JPS, 2011, 361-370" are analysed to demonstrate the latest development of this problem.

The internal stress will increase the density of defects in batteries, which as a result will affect the capacity and life span of them. The poor cyclic performance of battery could be modeled by strongly coupled diffusion-stress model. Haftbaradaran et.al has developed it to deal with the highly nonlinear behavior of diffusion process in high solute concentration.The validity of continuum has been proved by comparing with simulation results by Molecular dynamics, one of the comparison is demonstrated below, the discrete point are results obtained by MD method while the line represent calculation of the continuum model.

Four points concerning the nonlinear behavior of diffusion behavior has been discussed in the work by  Haftbaradaran et.al by eliminating their effects one by one in new comparisons between the theoretical and simulating results.

In the work of Zhang et.al, more attentions has been paid to the layered structure of electrode in LIBs. Their model has been adapted to discuss the symmetry of of electrode plate, conditions bilayer electrode plate and the effects of charging conditions. The role of current collector in relation with the electrode has been discussed and it has been concluded that the materials of current collector should be as thin as possible and the elastic modulus should be smaller to enhance a much lower stress in the electrode.

That is to say, the diffusion induced stress could be well modeled nowadays to predict the performance of new materials in battery electrode. From my perspective, the applicable of models in different kind of materials should be evaluated because the structure and and chemical properties vary between different kind of electrode materials.


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