Citation
Gokuli, Mahi (2021) A Combined High Temperature Tape-Casting and 2D Freeze-Casting Method for Polymer Membranes with Vertically Oriented Pores. Senior thesis (Major), California Institute of Technology. doi:10.7907/ywpf-cx09. https://resolver.caltech.edu/CaltechTHESIS:06062021-034939530
Abstract
Alternatives to lithium-ion batteries often require novel electrolytes, such as solvent-in-salt electrolytes and ionic liquids, for which commercial battery separators are unsuited. The Faber Lab at Caltech is researching processing methods for separators made of polymer/ceramic composite materials to ensure high wettability in novel liquid electrolytes. To this end, a flexible polymer separator is needed which provides a short working-ion transportation path for high ionic conductance. Here, a method was developed for the fabrication of poly(vinylidene fluoride-co-hexafluoropropylene) (PVDF-HFP) membranes with vertically aligned, nontortuous pores with pore diameters of a few microns by directional crystallization of dimethyl sulfone (DMSO₂). The method combines high-temperature tape casting and bidirectional freeze casting into a single step. Important considerations for the improvement of the method (particularly, avenues for reducing the pore size to below 1 μm) are discussed. In addition, the role of PVDF-HFP crystallization in bidirectional freeze-casting, a solvent crystallization method, is discussed.
| Item Type: | Thesis (Senior thesis (Major)) | ||||
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| Subject Keywords: | battery separators, tape casting, freeze casting, polymer membranes, vertical pores | ||||
| Degree Grantor: | California Institute of Technology | ||||
| Division: | Engineering and Applied Science | ||||
| Major Option: | Materials Science | ||||
| Thesis Availability: | Not set | ||||
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| Defense Date: | 28 May 2021 | ||||
| Record Number: | CaltechTHESIS:06062021-034939530 | ||||
| Persistent URL: | https://resolver.caltech.edu/CaltechTHESIS:06062021-034939530 | ||||
| DOI: | 10.7907/ywpf-cx09 | ||||
| ORCID: |
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| Default Usage Policy: | No commercial reproduction, distribution, display or performance rights in this work are provided. | ||||
| ID Code: | 14248 | ||||
| Collection: | CaltechTHESIS | ||||
| Deposited By: | Mahi Gokuli | ||||
| Deposited On: | 09 Jun 2021 18:07 | ||||
| Last Modified: | 15 Jun 2023 17:09 |
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