论文标题
固体电解质相间的生长：电子扩散与溶剂扩散
Growth of the Solid-Electrolyte Interphase: Electron Diffusion versus Solvent Diffusion
论文作者
论文摘要
固素电解质相间（SEI）基本上影响了锂离子电池的寿命。然而，导致SEI长期增长的运输机制仍然存在争议。这项研究旨在讨论由电子扩散与溶剂扩散介导的SEI生长的特征时间和最新依赖性。我们用连续模型描述了这两种运输机制，并将它们与实验结果进行了比较。我们表明，电子扩散可以解释观察到的电荷依赖性和时间依赖性。相比之下，我们证明溶剂扩散可以再现电荷依赖性或容量褪色的时间依赖性。没有中间体的溶剂扩散可以同时解释这两个依赖性。此外，我们强调了阳极电压和电荷最先进的关键作用在总体上对SEI增长。由于自我释放，这种依赖性可以解释与时域中典型的正方形行为的偏差。我们得出的结论是，电子扩散是导致依赖性SEI增长的相关过程。需要进一步的实验来研究独立于付费量的能力淡出的贡献的原因。
The solid-electrolyte interphase (SEI) substantially influences the lifetime of lithium-ion batteries. Nevertheless, the transport mechanism responsible for the long-term growth of the SEI remains controversial. This study aims at discussing the characteristic time and state-of-charge dependence of SEI growth mediated by electron diffusion versus solvent diffusion. We describe both transport mechanisms with continuum models and compare them to experimental results. We show that electron diffusion can explain both the observed state-of-charge dependence and the time dependence. In contrast, we demonstrate that solvent diffusion can reproduce either the state-of-charge dependence or the time dependence of capacity fade. There is no intermediate regime where solvent diffusion can explain both dependencies simultaneously. Furthermore, we emphasize the crucial role of anode voltage and state-of-charge on SEI growth in general. Due to self-discharge, this dependence can explain deviations from the typical square-root behavior in the time domain. We conclude that electron diffusion is the relevant process leading to the state-of-charge dependent SEI growth. Further experiments are needed to investigate the reason for contributions to the capacity fade that are independent of the state-of-charge.
