435025 Dynamics of Lithium Polymer Electrolytes Using X-Ray Photon Correlation Spectroscopy and Rheology

Monday, November 9, 2015
Exhibit Hall 1 (Salt Palace Convention Center)
Onyekachi Oparaji, Chemical and Biomedical Engineering, Florida state University, Tallahassee, FL, Daniel Hallinan Jr., Chemical and Biomedical Engineering, Florida State University, Tallahassee, FL, Suresh Narayanam, Time Resolved Research Group, Argonne National lab, Lermont, IL and Alec Sandy, Argonne National Laboratory, Argonne, IL

Polymer electrolytes are promising materials for high energy density rechargeable batteries. Battery fade can be caused by structural evolution in the battery electrode and loss of electrode/electrolyte adhesion during cycling. Both of these effects are dependent on polymer mechanical properties. Furthermore, cycling rate is dictated by the ion mobility of the polymer electrolyte. Lithium ion mobility is expected to be strongly coupled to polymer dynamics. Therefore, we investigate polymer dynamics as a function of salt concentration using X-ray Photon Correlation Spectroscopy (XPCS) and rheology. We report the direct comparison of structural relaxation time (XPCS) and stress relaxation time (rheology) of high molecular PS-b-PEO membranes as a function of salt concentration.

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