Composite polymer electrolytes using fumed silica fillers: synthesis, rheology and electrochemistry Page: 1 of 16
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X6/28/1999 15:11 , 919-515-3465 NCSU CHE PAGE 02
COMPOSITE POLYMER ELECTROLYTES USING FUMED SILICA
FILLERS: SYNTHESIS, RHEOLOGY AND ELECTROCHEMISTRY
Saad A. Khan and Peter S. Fedkiw
Department of Chemical Engineering
North Carolina State University, Raleigh, NC 27695-7905
Ph: 919-515-4519; email:email@example.com
Gregory L. Baker
Department of Chemistry
Michigan State University, East Lansing, MI 48824-1322
A Final Year Report submitted to the
U.& Department of Energy
Our goal for the project initiated in 1994 was to show that composite polymer electrolytes
can be developed with the following desirable properties: a) processability, b) mechanical
strength, c) ionic conductivity that rivals gel electrolytes, and d) electrochemical stability.
Several composite electrolyte systems were developed using different oligomers, salts and fumed
silica (Table 1), although all not possible permutations were examined. Our principal findings
reveal that fumed-silica composites (bearing cross-linked or uncross-linked surface groups)
* room temperature ionic conductivities exceeding 1x10' S/cm
* high mechanical strength with an elastic modulus similar to elastomers (e.g., ~105 Pa)
" shear thinning viscosity leading to easy processability
" improved electrochemical stability with lithium
In addition, our preliminary full-cell cycling tests show that the composite electrolyte
functions well when using LiCoO2 or LiMnzO4 as the cathode.
These results are extremely encouraging, and selected aspects of these are discussed
below in more detail.
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Khan, Saad A.; Fedkiw, Peter S. & Baker, Gregory L. Composite polymer electrolytes using fumed silica fillers: synthesis, rheology and electrochemistry, report, June 28, 1999; United States. (digital.library.unt.edu/ark:/67531/metadc723629/m1/1/: accessed December 12, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.