Skip to Main Content
Frequently Asked Questions
Submit an ETD
Global Search Box
Need Help?
Keyword Search
Participating Institutions
Advanced Search
School Logo
Files
File List
thesis Jin.pdf (2.4 MB)
ETD Abstract Container
Abstract Header
QUARTZ CRYSTAL MICROBALANCE WITH DISSIPATION MEASUREMENTS OF BINDER SWELLING AND SALTS EFFECTS ON PHYSICAL CROSSLINK HYDROGEL
Author Info
Qian, Jin
Permalink:
http://rave.ohiolink.edu/etdc/view?acc_num=akron1525746452221279
Abstract Details
Year and Degree
2018, Master of Science, University of Akron, Polymer Engineering.
Abstract
Advanced active materials, such as Si, for lithium ion battery electrodes are becoming highly engineered, but their cycling performance can be significantly impacted by the mechanical, transport, and electrochemical properties of the polymeric binder in the electrode. The swelling and plasticization of most widely used binder poly(vinylidene difluoride) (PVDF), poly(acrylic acid) (PAA), branched polyethylenimine (BPEI) and potential binder sulfonated ethylene propylene rubber (SEPDM) by common carbonate-based electrolytes is probed using quartz crystal microbalance with dissipation (QCM-D). The swelling of the PVDF was significantly greater than the other polymers, while addition of Li salt only marginally deceased the swelling. The composition of ethylene and propylene carbonate in the electrolyte more significantly impacts the swelling with the 50:50 mixture exhibiting the greatest swelling. The shear modulus of the PVDF remains on the order of 10 MPa for all conditions examined. This mechanical invariance is attributed to the semi-crystalline structure of PVDF that provides a robust network. These measurements provide insight into the electrolyte-binder interactions and can be used to help select pairs for emerging high-performance electrodes from the aspect of swelling of binder by carbonate electrolyte and interaction between binder and active material. As QCM-D is a very sensitive and accurate method for in-situ real time analysis on thin film swelling and mechanical properties, it can also be used to measure salts effect on the swelling of physical crosslink hydrogel. In this study, the Hofmeister series effect on swelling of 2-(N-ethylperfluorooctane sulfonamido)ethyl acrylate (FOSA)/N,N-dimethylacrylamide (DMA) physical crosslink hydrogel which containing 9.7 mol% FOSA (DF10) is introduced. The influence of temperature and different salts species (Na
2
SO
4
and NaClO
4
) are investigated. The DF10 swollen in aqueous solution dissipates significant energy to enable determine of the mechanical properties. The swelling of DF10 is reversible with temperature increases and salts concentration. Na
2
SO
4
decreases the swelling of DF10 and increases elastic modulus. Conversely, NaClO
4
increases the swelling ratio, softens the DF10 hydrogel and increases viscosity in low concentration NaClO
4
solutions (from 0.003M to 0.1M). At higher NaClO
4
concentration (3M), the swelling decreases slightly when compared with the swelling at 0.3M. This study demonstrated that salts have dramatic effect on swelling of DF10 in aqueous solution, resulting in the change on swelling ratio and mechanical properties of DF10 hydrogel. The efficiency of the anions in increasing swelling was found to be consistent with the Hofmeister anion sequence with the ability of destabilize the hydrophobic aggregates.
Committee
Bryan Vogt (Advisor)
Erol Sancaktar (Committee Chair)
Yu Zhu (Committee Member)
Subject Headings
Polymers
Recommended Citations
Refworks
EndNote
RIS
Mendeley
Citations
Qian, J. (2018).
QUARTZ CRYSTAL MICROBALANCE WITH DISSIPATION MEASUREMENTS OF BINDER SWELLING AND SALTS EFFECTS ON PHYSICAL CROSSLINK HYDROGEL
[Master's thesis, University of Akron]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=akron1525746452221279
APA Style (7th edition)
Qian, Jin.
QUARTZ CRYSTAL MICROBALANCE WITH DISSIPATION MEASUREMENTS OF BINDER SWELLING AND SALTS EFFECTS ON PHYSICAL CROSSLINK HYDROGEL.
2018. University of Akron, Master's thesis.
OhioLINK Electronic Theses and Dissertations Center
, http://rave.ohiolink.edu/etdc/view?acc_num=akron1525746452221279.
MLA Style (8th edition)
Qian, Jin. "QUARTZ CRYSTAL MICROBALANCE WITH DISSIPATION MEASUREMENTS OF BINDER SWELLING AND SALTS EFFECTS ON PHYSICAL CROSSLINK HYDROGEL." Master's thesis, University of Akron, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=akron1525746452221279
Chicago Manual of Style (17th edition)
Abstract Footer
Document number:
akron1525746452221279
Download Count:
701
Copyright Info
© , all rights reserved.
This open access ETD is published by University of Akron and OhioLINK.