Oriented one-dimensional nanostructures have been of substantial interest as electrodes for lithium-ion batteries due to the better performance both in terms of initial capacity and lower capacity fade compared to powder pressed electrodes. This paper focuses on a model driven approach to understanding the relationship between the morphology of these oriented nanostructures to the performance of the battery. The Newman-type P2D modeling technique is applied to a porous electrode made up with solid continuous cylinders that extends from the current collectors to separator. TiO₂ columnar nanostructures of varying heights were synthesized using the aerosol chemical vapor deposition (ACVD) and their performance as electrodes in a lithium-ion battery was measured. This electrochemical transport model was validated with the experimental data. This model was used to understand the role of transport parameters, including the diffusivity of lithium in the TiO₂ and the electronic conductivity of the TiO₂ columns, and structural parameters, including the height of the columns and the porosity of the electrode, on the areal capacity of a lithium ion battery at different rates of discharge. The model enables for the prediction of optimized structural parameters of one-dimensional electrodes tailored to the desired application of lithium and sodium-ion batteries.

中文翻译：

---

一维取向锂离子电池电极的基于模型的分析

定向的一维纳米结构作为锂离子电池的电极已引起人们的极大兴趣，因为与粉末压制电极相比，其在初始容量和较低的容量衰减方面均具有更好的性能。本文着重于模型驱动方法，以了解这些定向纳米结构的形态与电池性能之间的关系。Newman型P2D建模技术应用于由实心连续圆柱体构成的多孔电极，该圆柱体从集电器延伸到隔板。二氧化钛₂使用气溶胶化学气相沉积（ACVD）合成了高度不同的柱状纳米结构，并测量了它们在锂离子电池中作为电极的性能。该电化学传输模型已通过实验数据验证。该模型用于了解传输参数（包括TiO ₂中锂的扩散率和TiO ₂柱的电子电导率）以及结构参数（包括柱的高度和电极的孔隙率）在电极上的作用。锂离子电池在不同放电速率下的单位面积容量。该模型可以预测针对锂和钠离子电池的所需应用量身定制的一维电极的最佳结构参数。