论文标题
电池循环过程中的固体电解质相间相：生长制度理论
Solid-Electrolyte Interphase During Battery Cycling: Theory of Growth Regimes
论文作者
论文摘要
现代锂离子电池的容量褪色主要是由固体电解质相（SEI）的形成和生长引起的。许多连续模型通过研究电池存储期间的SEI增长来支持其理解和缓解。但是，只有少数电化学模型讨论电池运行过程中的SEI增长。在本文中，我们开发了一个连续模型，该模型始终捕获开路电位，电流方向，当前幅度和周期数对SEI生长的影响。我们的模型基于中性锂原子的形成和扩散，这些锂原子通过SEI携带电子。最近的短期和长期实验为我们的模型提供了验证。我们表明，SEI生长是反应，扩散或迁移限制。我们首次将这些机制之间的过渡建模，并用$ 0 \ leqβ\ leq 1 $的$ΔQ\ propto t^β$的经验得出的能力淡出模型。基于我们的模型，我们确定了加速SEI增长的关键操作条件。
The capacity fade of modern lithium ion batteries is mainly caused by the formation and growth of the solid-electrolyte interphase (SEI). Numerous continuum models support its understanding and mitigation by studying SEI growth during battery storage. However, only a few electrochemical models discuss SEI growth during battery operation. In this article, we develop a continuum model, which consistently captures the influence of open circuit potential, current direction, current magnitude, and cycle number on the growth of the SEI. Our model is based on the formation and diffusion of neutral lithium atoms, which carry electrons through the SEI. Recent short- and long-term experiments provide validation for our model. We show that SEI growth is either reaction, diffusion, or migration limited. For the first time, we model the transition between these mechanisms and explain empirically derived capacity fade models of the form $ΔQ\propto t^β$ with $0 \leq β\leq 1$. Based on our model, we identify critical operation conditions accelerating SEI growth.
