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N6.08 - Surface Reconstruction and Chemical Evolution of LiNixMnxCo1-2xO2 Cathode Materials in Lithium-Ion Batteries 
Date/Time:
April 24, 2014   10:15am - 10:30am
 
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The purpose of the study was to correlate surface and bulk structural characteristics of LiNixMnxCo1-2xO2 (NMC) materials with the electrochemical performance. Aided with the state-of-the-art atomic-scale annular dark-field scanning transmission electron microscopy (ADF/STEM) and electron energy loss spectroscopy (EELS) as well as ensemble-averaged synchrotron X-ray absorption spectroscopy, the present study provides insights into the surface reconstruction and chemical evolution in NMC materials and directly leverages the origin(s) of long-standing challenges in NMC materials, including high-voltage capacity fading, impedance buildup and first-cycle coulombic inefficiency. Our results represent an important pathway towards understanding layered cathode materials and the methodology herein provides guidance to advance knowledge for battery materials in general.
 


 
 
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