【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 environment
【机 构】
：
Clean Nano Energy Center,State Key Laboratory of Metastable Materials Science and Technology,Yanshan
论文部分内容阅读
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.
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