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N4.02 - Visualization of Electrode-Electrolyte Interfaces in LiPF6/EC/DEC Electrolyte for Lithium Ion Batteries via In-Situ TEM 
Date/Time:
April 23, 2014   8:30am - 8:45am
 
Speaker:
 
 
 
 
Li 
 
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An understanding of the electrochemical processes at electrode-electrolyte interfaces such as lithium intercalation or reaction with the electrode, Solid Electrolyte Interface (SEI) formation, lithium dendritic growth and so on is critically important for the design of batteries with improved performance. Using the newly designed electrochemical liquid TEM cell, we have directly observed such processes at the electrode-electrolyte interfaces in a commercial LiPF6/EC/DEC electrolyte for lithium ion batteries. During the charge-discharge cycles, electrochemical lithiation induced structural transformation of electrode, local strain and structural distortion from the inhomogeneous lithiation have been observed. Dendritic growth of lithium metal and the subsequent stripping of lithium have also been imaged. The effect of an addition of additives in the electrolyte on metal deposition has been investigated by in situ studies. Additionally, we were able to track the formation of SEI layer on the electrode and quantify its stability and growth kinetics under cyclic voltammetry. These results shed lights on strategies of improving electrode design for better performance and reducing short-circuit failure of lithium ion batteries.
 


 
 
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