In situ observation of cracking and self-healing of solid electrolyte interphases during lithium deposition

• 作者: Tingting Yang Hui Li Yongfu Tang Jingzhao Chen Hongjun Ye Baolin Wang Yin Zhang Congcong Du Jingming Yao Baiyu Guo Tongde Shen Liqiang Zhang Ting Zhu Jianyu Huang
• 来源期刊: 科学通报（英文版）
• 年，卷（期）: 2021,（17）
• 所属期刊栏目: ARTICLES
• 页码范围: 1754-1763
• 页数: 10页
• 语种: 英文

摘要

The growth of lithium(Li)whiskers is detrimental to Li batteries.However,it remains a challenge to directly track Li whisker growth.Here we report in situ observations of electrochemically induced Li deposition under a CO2 atmosphere inside an environmental transmission electron microscope.We find that the morphology of individual Li deposits is strongly influenced by the competing processes of crack-ing and self-healing of the solid electrolyte interphase(SEI).When cracking overwhelms self-healing,the directional growth of Li whiskers predominates.In contrast,when self-healing dominates over cracking,the isotropic growth of round Li particles prevails.The Li deposition rate and SEI constituent can be tuned to control the Li morphologies.We reveal a new"weak-spot"mode of Li dendrite growth,which is attrib-uted to the operation of the Bardeen-Herring growth mechanism in the whisker's cross section.This work has implications for the control of Li dendrite growth in Li batteries.