In-situ observation methods for lithium dendrite growth at the solid-state electrolyte-electrode interface
固态电解质-电极界面锂枝晶生长的原位观测方法

摘要

固态电解质被广泛认为是抑制锂枝晶生长的关键材料，但实际应用中仍面临界面不稳定和锂枝晶穿透的问题。为了深入理解锂枝晶在固态电解质-电极界面的生长机制，本文聚焦于原位观测技术在该领域的应用与创新。通过构建具有代表性的原位电池装置，并结合透射电子显微镜、X射线断层成像等多种观测手段，揭示了锂枝晶的起始位置、扩展路径及其与界面形貌、应力状态的关系。本研究不仅为锂枝晶抑制机制提供直接证据，也为固态电池设计优化提供实验依据，推动高安全性固态锂电池的实际进展。

Abstract

Solid-state electrolytes are widely regarded as key materials for suppressing lithium dendrite growth. However, they still face issues of interface instability and lithium dendrite penetration in practical applications. To gain an in-depth understanding of the growth mechanism of lithium dendrites at the solid-state electrolyte-electrode interface, this paper focuses on the application and innovation of in-situ observation technologies in this field. By constructing representative in-situ battery devices and combining various observation methods such as transmission electron microscopy (TEM) and X-ray tomography, the initiation sites, propagation paths of lithium dendrites, and their relationships with interface morphology and stress state are revealed. This study not only provides direct evidence for the lithium dendrite suppression mechanism but also offers an experimental basis for the design optimization of solid-state batteries, promoting the practical development of high-safety solid-state lithium batteries.