Journal
MICROSCOPY AND MICROANALYSIS
Volume 20, Issue 4, Pages 1029-1037Publisher
CAMBRIDGE UNIV PRESS
DOI: 10.1017/S1431927614012744
Keywords
electrochemical liquid cell; in situ TEM; solid electrolyte interphase; lithium-ion batteries
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Funding
- Office of Energy Efficiency and Renewable Energy, Vehicle Technologies Program, US Department of Energy (DOE)
- Division of Materials Sciences and Engineering, Office of Basic Energy Sciences, US DOE
- Oak Ridge National Laboratory's Center for NanophaseMaterials Sciences (CNMS)
- Scientific User Facilities Division, BES- DOE
- ORNL's Alvin M. Weinberg Early Career Fellowship Program
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Complex, electrochemically driven transport processes form the basis of electrochemical energy storage devices. The direct imaging of electrochemical processes at high spatial resolution and within their native liquid electrolyte would significantly enhance our understanding of device functionality, but has remained elusive. In this work we use a recently developed liquid cell for in situ electrochemical transmission electron microscopy to obtain insight into the electrolyte decomposition mechanisms and kinetics in lithium-ion (Li-ion) batteries by characterizing the dynamics of solid electrolyte interphase (SEI) formation and evolution. Here we are able to visualize the detailed structure of the SEI that forms locally at the electrode/electrolyte interface during lithium intercalation into natural graphite from an organic Li-ion battery electrolyte. We quantify the SEI growth kinetics and observe the dynamic self-healing nature of the SEI with changes in cell potential.
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