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Towards Development Of Polymeric Compounds For Energy Storage Devices And For Low Energy Loss Tires

Raut, Prasad S.
http://orcid.org/0000-0002-0267-8005
http://rave.ohiolink.edu/etdc/view?acc_num=akron1493947416353888

Abstract Details

2017, Doctor of Philosophy, University of Akron, Polymer Engineering.
This research focused on the development of polymeric materials with enhanced electrochemical performance in Li-ion batteries (LIB) and reduction of rolling resistance in tire tread compounds. The first part of the thesis is devoted to separators and electrolytes used in Li-ion batteries. Specifically, the research focused on ionogel polymer electrolytes (IGPE) for high temperature LIB operation and composite solid polymer electrolytes (CSPE) for improvement of the mechanical properties of the existing solid polymer electrolyte technology. IGPEs were fabricated by incorporating the pores of thin film syndiotactic polystyrene (sPS) gels with ionic liquid (IL). The thermal and electrochemical performance of the ionogel membrane were compared with polyolefin based electrolyte-separator technology using Li+/ graphite half-cells at room temperature and at elevated temperatures (80-100 °C). sPS ionogels showed negligible shrinkage and stable electrochemical performance at 100 °C due to higher porosity and wettability of the polymer strands by the IL. The work further ventured into assessment of the state of IL molecules in the pores of sPS gel. The results revealed that the melting point of IL molecules was elevated due to confinement of the IL molecules in the sPS network. At room temperature, the non-bonded cation-cation through-space correlation was obtained for confined IL, while such correlation was absent in bulk IL. The information on ion aggregation and the effect of confinement can guide proper selection of polymer-IL pair for electrochemical membranes. The results of investigation on a composite solid polymer electrolyte (CSPE) membranes is presented in chapter VI. A photocurable plasticized solid polymer electrolyte formulation was incorporated in porous sPS gel with the aim of increasing the mechanical strength of the neat SPE. The all solid-state CSPE was characterized using TGA and DSC to assess their thermal stability. Mechanical strength of the composite materials showed a six-fold increase in tensile strength and much higher storage modulus compared to neat SPE. The DSC and XRD data analysis showed no change in the crystalline structure of electrolyte in CSPE, thus retaining the amorphous polymeric domains resulting in high ionic mobility at room temperature (4.3 x 10-4 S/cm). These flexible materials were tested as electrolyte membranes in Li-ion batteries using LiFePO4 half cells. It was observed that the electrochemical window of CSPE expanded up to 5V due to the presence of the sPS matrix. The last part of the thesis covers the strategies for reduction of hysteresis loss in filled elastomeric compounds by increased affinity between filler and polymer chain via coupling agent. The role of novel graft copolymer poly(butadiene-graft-pentafluorostyrene) (PB-g-PPFS) as a physical coupling agent between carbon black and styrene butadiene rubber (SBR) was studied. Physical arene-perfluoroarene bonding between carbon black and PPFS grafts led to reduced filler-filler networking. The presence of arene-perfluoroarene bonding was confirmed by analysis of Raman spectra and TEM images. Filler flocculation and Payne effect analysis showed that the addition of the coupling agent resulted in increased filler dispersion and reduced energy dissipation. The viscoelastic loss was reduced by as much as 12 % as compared to control material due to improved filler-rubber affinity promoted by the coupling agent.
Sadhan Jana, Dr. (Advisor)
Bryan Vogt, Dr. (Committee Chair)
Younjin Min, Dr. (Committee Member)
Toshikazu Miyoshi, Dr. (Committee Member)
George Chase, Dr. (Committee Member)
Plastics; Polymer Chemistry; Polymers
Li-ion battery membranes, high temperature battery, composite solid polymer electrolyte, coupling agent, filler-filler network

Recommended Citations

Citations

  • Raut, P. S. (2017). Towards Development Of Polymeric Compounds For Energy Storage Devices And For Low Energy Loss Tires [Doctoral dissertation, University of Akron]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=akron1493947416353888

    APA Style (7th edition)

  • Raut, Prasad. Towards Development Of Polymeric Compounds For Energy Storage Devices And For Low Energy Loss Tires . 2017. University of Akron, Doctoral dissertation. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=akron1493947416353888.

    MLA Style (8th edition)

  • Raut, Prasad. "Towards Development Of Polymeric Compounds For Energy Storage Devices And For Low Energy Loss Tires ." Doctoral dissertation, University of Akron, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=akron1493947416353888

    Chicago Manual of Style (17th edition)

akron1493947416353888
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