Self-assembly of conformal polymer electrolyte film for lithium ion microbatteries
Name
212375894-MIT.pdf
Description
Full printable version
Size
1.58 MB
Format
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Checksum (MD5)
98f2c99f5b0268dd7afe43a25b022806
Author(s)
Bieber, Christalee
Advisor(s)
Yet-Ming Chiang.
Date Issued
2007
Publisher
Massachusetts Institute of Technology
Abstract
I apply the theory of polar and apolar intermolecular interactions to predict the behavior of combinations of common battery materials, specifically the cathode substrate lithium cobalt oxide (LCO) and the polymer separator poly(ethylene oxide). These predictions were first tested qualitatively using hexane and PTFE, which have well-established surface energies, and then by measuring the contact angles of PEO on LCO in hexane and hexadecane, chosen for their immiscibility in PEO. For better comparison, these experiments were repeated using water instead of PEO, for a total of four systems tested. This data allowed an estimate for the experimental surface energy components of LCO to be derived, resulting in 18.3 ± 1 mJ/m2 for [gamma]LW, 0.22 ± 0.02 mJ/m2 for [gamma]+, and 5.8 ± 1.6 mJ/m2 for [gamma]-, compared to the previously reported values of 40.8 mJ/m2 for [gamma]LW, 0.0008 mJ/m2 for [gamma]+, and 0.21 mJ/m2 for [gamma]-. This variation is probably due to a variety of factors, including instrumental uncertainty in the contact angle measurement, a difference in contact angle measurement procedure, and inevitable contamination by water and other materials. Using this new data, self-assembling electrolyte-cathode systems are predicted, like LCO-polyacrylonitrile-chloroform.
Description
Thesis (S.B.)--Massachusetts Institute of Technology, Dept. of Physics, 2007.
Includes bibliographical references (leaves 37-39).
Subjects
Physics.
MIT Department
Massachusetts Institute of Technology. Department of Physics
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