New Insights into Mossy Li Induced Anode Degradation and Its Formation Mechanism in Li–S Batteries,ACS Energy Letters

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New Insights into Mossy Li Induced Anode Degradation and Its Formation Mechanism in Li–S Batteries
ACS Energy Letters ( IF 19.3 ) Pub Date : 2017-11-02 00:00:00 , DOI: 10.1021/acsenergylett.7b00886
Yunya Zhang ₁ , Frederick M. Heim ₁ , Ningning Song ₁ , Jamison L. Bartlett ₁ , Xiaodong Li ₁

Affiliation

Optimization of cathodes and cell configurations has dramatically improved current Li–S batteries; it is now necessary to rescrutinize failure in Li–S batteries from an anodic perspective. Here, we reveal another possible failure mechanism induced by mossy Li in long-lifespan Li–S batteries and present a factor that might influence the inhomogeneous growth of Li whiskers. The large volume expansion derived from the growth of mossy Li promoted the formation and densification of a crust layer comprising passive sediments, which blocked the charge transfer for the lithium underneath, leading to low lithium utilization and battery failure. Further research showed the growth of mossy Li is related to inhomogeneous stripping, which began at imperfections on the SEI and self-amplified into large irregular pits, from which delicate mossy Li whiskers sprouted preferentially because of the relatively stable environment within. These findings are anticipated to enhance the performance of Li–S batteries and facilitate the development of other lithium batteries.

中文翻译：

锂电池中生苔锂诱导的阳极降解及其形成机理的新见解

阴极和电池配置的优化极大地改善了当前的Li–S电池。现在有必要从阳极角度重新审查Li-S电池的故障。在这里，我们揭示了长寿命Li-S电池中由长满苔藓的锂引起的另一种可能的失效机制，并提出了一个可能影响锂晶须不均匀生长的因素。由长满苔藓的锂的生长引起的大体积膨胀促进了包含被动沉积物的地壳层的形成和致密化，这阻碍了下方锂的电荷转移，从而导致低锂利用率和电池故障。进一步的研究表明，长满苔藓的Li的生长与剥离不均匀有关，剥离开始于SEI的瑕疵，并自扩增为大的不规则凹坑，由于内部相对稳定的环境，微妙的苔藓状李晶须优先从中生出。这些发现有望增强Li-S电池的性能并促进其他锂电池的开发。

更新日期：2017-11-03

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