A pseudo two-dimensional model (P2D) is presented that describes the effect of the structural properties of the positive electrode on Li-ion cell performance during discharge. The validation of the mono-modal model was done by using Doyle's experiment and results [C.M. Doyle, University of California, Berkeley (1995)]. A large increase or decrease in the porosity beyond a specific value led to a sharp change in the cell voltage curve and lower cell capacities. The maximum specific energy was obtained in the porosity range of 0.55, while the specific power still had a high value. Furthermore, different particle size distribution models, including mono-modal, bi-modal and 3-particle models, were compared to each other. The mono-modal model was the ideal state with the lowest total polarization. The bi-modal and 3-particle models approached this ideal state when the volume fraction of the smallest particles in their structures increased. This structural arrangement in these models led to more uniform local current density distribution profiles resulting in a greater decrease in cell polarization. Different discharge current densities were applied to different particle size distribution models, and the results showed that the particle size distribution has a greater effect at higher discharge current densities.

中文翻译：

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孔隙率和粒径分布对锂离子电池性能的影响研究

提出了伪二维模型（P2D），该模型描述了正极结构特性对放电过程中锂离子电池性能的影响。单模态模型的验证是通过使用Doyle的实验和结果[CM Doyle，加利福尼亚大学伯克利分校（1995）]完成的。孔隙率的大幅度增加或减小超过特定值会导致电池电压曲线的急剧变化和较低的电池容量。在0.55的孔隙率范围内获得最大比能，而比功率仍具有较高的值。此外，还比较了不同的粒度分布模型，包括单峰，双峰和3-颗粒模型。单峰模型是具有最低总极化的理想状态。当其结构中最小粒子的体积分数增加时，双峰模型和3粒子模型接近此理想状态。这些模型中的这种结构安排导致更均匀的局部电流密度分布曲线，从而导致电池极化的更大降低。将不同的放电电流密度应用于不同的粒径分布模型，结果表明，在较高的放电电流密度下，粒径分布具有更大的影响。