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The impact of multi-layered porosity distribution on the performance of a lithium ion battery

机译：多层孔隙率分布对锂离子电池性能的影响

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摘要

This study investigates the impact of a multi-layered porosity profile on the electrical and thermal performance of a lithium-ion battery. Consideration is given to key attributes of the battery, namely its specific power and energy and the temperature distribution that may generated throughout the cell under electrical load. The COMSOl Multiphysics software tool has been employed to develop a 3D electrochemical–thermal model of a commercially available 10 Ah lithium iron phosphate cell. Through an extensive simulation study, for a fixed value of active material, the impact of varying the porosity profile across both the thickness and height of the electrode has been studied. For each case study, the distribution of reaction current and the corresponding localised state of charge and temperature profile are quantified for a constant current discharge of 5C. Simulation results highlight that a multi-layered porosity distribution across the thickness of the electrode has the potential to yield superior battery performance compared to when the porosity is varied along the electrode height. Moreover, the total heat generation within the cathode may be reduced by up to 14% compared to a Reference Case, along with 0.33% and 0.44% improvement in the specific energy and power, respectively.
机译：这项研究调查了多层孔隙率曲线对锂离子电池电学和热学性能的影响。考虑电池的关键属性，即其比功率和能量以及在电负载下可能在整个电池单元中产生的温度分布。 COMSOl Multiphysics软件工具已用于开发市售10Ah磷酸铁锂电池的3D电化学-热模型。通过广泛的模拟研究，对于固定值的活性材料，已经研究了在电极的厚度和高度上改变孔隙率分布的影响。对于每个案例研究，对于5C的恒定电流放电，都将量化反应电流的分布以及相应的局部电荷状态和温度曲线。仿真结果表明，与沿电极高度变化的孔隙率相比，跨电极厚度的多层孔隙率分布具有产生优异电池性能的潜力。此外，与参考案例相比，阴极内的总热量生成最多可减少14％，同时比能和功率分别提高0.33％和0.44％。

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