Linking the Defects to the Formation and Growth of Li Dendrite in All-Solid-State Batteries,Advanced Energy Materials

当前位置： X-MOL 学术 › Adv. Energy Mater. › 论文详情

Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)

Linking the Defects to the Formation and Growth of Li Dendrite in All-Solid-State Batteries
Advanced Energy Materials ( IF 24.4 ) Pub Date : 2021-10-10 , DOI: 10.1002/aenm.202102148
Hongchun Wang ₁ , Haowen Gao ₂ , Xiaoxuan Chen ₃ , Jianping Zhu ₃ , Wangqin Li ₂ , Zhengliang Gong ₁ , Yangxing Li ₄ , Ming‐Sheng Wang ₂ , Yong Yang _{1,

3}

Affiliation

The nucleation and growth of Li metal during deposition and the associated dendrite penetration are the critical and fundamental issues influencing the safety and power density of solid-state lithium metal batteries (SSLBs). However, investigations on Li metal deposition/dissolution especially the formation and growth of Li dendrites and their determining factors in the all-solid-state electrochemical systems are still lacking. In this work, in situ observations of the Li metal growth process, and defects induced heterogeneous deposition under cathodic load, are reported. By exploiting in situ scanning electron microscopy, along with electrochemical analytical approaches, the spatial distribution and morphological evolution of the deposited Li at the electrode|solid electrolyte interface are obtained and discussed. This investigation reveals that the formation of lithium whiskers is decided by the local Li ion flux and the deposition active sites, which are closely dependent on the content and types of defects in the polycrystalline electrolyte. Moreover, the defect regions exhibit faster Li deposition kinetics and higher nucleation tendency. These results can advance the fundamental understanding of the Li penetration mechanism in SSLBs.

中文翻译：

将缺陷与全固态电池中锂枝晶的形成和生长联系起来

沉积过程中锂金属的成核和生长以及相关的枝晶穿透是影响固态锂金属电池 (SSLB) 安全性和功率密度的关键和基本问题。然而，关于锂金属沉积/溶解，尤其是锂枝晶的形成和生长及其在全固态电化学系统中的决定因素的研究仍然缺乏。在这项工作中，报告了锂金属生长过程的原位观察，以及阴极负载下缺陷诱导的异质沉积。通过利用原位扫描电子显微镜和电化学分析方法，获得并讨论了在电极|固体电解质界面处沉积的锂的空间分布和形态演变。该研究表明，锂晶须的形成取决于局部锂离子通量和沉积活性位点，而这与多晶电解质中缺陷的含量和类型密切相关。此外，缺陷区域表现出更快的锂沉积动力学和更高的成核趋势。这些结果可以促进对 SSLB 中锂渗透机制的基本理解。

更新日期：2021-11-11

点击分享查看原文

点击收藏

阅读更多本刊最新论文本刊介绍/投稿指南11