传递性质参数对锂硫电池放电性能影响模型分析

Modeling Study of Transfer Property Parameters on the Effect of Discharge Performance for Lithium-sulfur Battery

锂硫电池因其高理论能量密度和硫廉价易得而引起了广泛的研究关注,为了改善电池性能,需要了解电池中参与反应的锂、硫离子及电子传递对电池宏观放电反应过程的影响。通过对锂硫电池放电过程进行了合理简化,建立能够描述锂硫电池放电过程的一维拟均相模型。定量模拟研究了不同传递性质参数变化对表观放电结果的影响,结果表明,增大锂离子扩散系数有利于提高电池性能,对于多硫离子的扩散系数,考虑到穿梭效应的影响应需结合电解液选择控制在较低水平上,较高的固相电导率是有利的。

Lithium-sulfur batteries have attracted extensive research attention due to their high theoretical energy density and the cheap and easy availability of sulfur.In order to improve the battery performance.It is necessary to understand the influence of the lithium and sulfur ions involved in the reaction and electron transfer on the macroscopic discharge reaction process of the battery.Therefore,by reasonably simplifying the discharge process of lithium-sulfur batteries,a one-dimensional proposed homogeneous phase model is established to describe the discharge process of lithium-sulfur batteries.Quantitative simulations investigated the effect of different transfer property parameter variations on the apparent discharge results,and the results showed that increasing the lithium ion transfer coefficient is beneficial to improve performance.For the diffusion coefficient of polysulfide ions,taking into account the effect of shuttle effect needs to be combined with electrolyte selection control at a lower level.At last,higher conductivity of the solid phase is beneficial.