The order of addition of corn starch/lithium perchlorate/glycerol affects the optical, mechanical, and electrical properties of a solid polymer electrolyte
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Optical, mechanical, and electric properties of solid polymer electrolyte (SPE) were affected by the order of addition of corn starch (S), lithium perchlorate (Li), and glycerol (G) during the preparation process. Four formulations were made based on whether Li was added prior to S gelatinization (simultaneous formulations SGLi and SLi+G) or whether it was added after S was gelatinized (sequential formulations SG+Li and S+LiG). Simultaneous formulations produced films with smaller elongation-at-break response (60–75%) relative to their sequential counterparts (75–82%). The simultaneous formulations exhibited higher electrical conductivity (∼0.7 mS cm−1) and capacitance (∼0.017 F cm−2) and electrochemical stability than the sequential formulations (∼0.9 mS cm−1 and ∼0.012 F cm−2) at room temperature. Results from FTIR and DSC analyses indicated that starch re-crystallization in casting phase could lead to variations on electrical properties for the different SPE formulations. It was postulated that Li cations replace hydrogen ions inside starch molecules, retarding the re-crystallization of starch molecules.
KeywordsSolid polymer electrolyte Corn starch Lithium perchlorate Order of addition Re-crystallization
The authors thank the Consejo Nacional de Ciencia y Tecnología (CONACyT) for partially financing this work through project 236500.
E. J. Vernon-Carter proposed the use of contact angle and EIS for monitoring film stability. J. Alvarez-Ramirez organized results and discussion. L.A. Bello-Perez helped with the characterization of starch-based films. C. Roldan-Cruz (Ph.D. student) designed and performed the EIS experiments. A. Garcia-Hernandez (Ph.D. student) carried out conductivity, opacity, and mechanical response tests. L. Huerta carried out and interpreted XPS studies. All authors contributed to the writing of the manuscript.
Compliance with ethical standards
Conflict of interest
The authors declare no competing financial interest.
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