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RenT.T (final).pdf (2.62 MB)
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FABRICATION AND EVALUATION ON ELECTROCHEMICAL PERFORMANCE OF SOLID POLYMER ELECTROLYTE MEMBREANE FOR LITHIUM-ION BATTERY
Author Info
Ren, tianli, ren
Permalink:
http://rave.ohiolink.edu/etdc/view?acc_num=akron1495712448807722
Abstract Details
Year and Degree
2017, Master of Science in Polymer Engineering, University of Akron, Polymer Engineering.
Abstract
Based on the ternary phase diagram of polyethylene (glycol) diacrylate (PEGDA), ethylene carbonate (EC) and lithium bis-(trifluoromethane sulfonyl) imide (LiTFSI), polymer electrolyte membranes (PEMs) were fabricated in various proportions via photo-polymerization. Ionic conductivities of PEMs containing various ratios of three constitutes were measured by means of AC Impedance spectroscopy. Solid polymer electrolyte membrane, consisting of 20/40/40 PEGDA/EC/LiTFSI, was chosen as the appropriate solid PEM that afforded high ionic conductivity and good mechanical properties. The ionic conductivity of such PEM at 25 °C was found to reach a superionic level of 10-3 S cm-1, which is rather difficult to come by for a conventional solid-state electrolyte. More importantly, the present PEM was compatible with conventional electrodes such as LiFePO4 (LFP), Li4Ti5O12 (LTO) and graphite. The Li/PEM/LTO cell was found to achieve the capacity value of 180 mAh/g at a current rate of 0.2 C for both room temperature and 60 °C, which was even higher than the theoretical capacity of LTO of 170 mAh/g. What is more, the capacity of Li/PEM/LTO cell at 2 C, which was rather a high speed for a solid electrolyte membrane, could reach 140 mAh/g, indicating that the PEM was truly compatible with LTO electrode at both high cycling speed and high temperature. In addition, the LTO half-cell was found to survive charge/discharge cycling for more than 200 cycles with 95% retention, which implied that little or no degradation of the electrode occurred during the charge/discharge cycling. The Li/PEM/LFP half-cell and Li/PEM/graphite half-cell also reached the capacity close to the theoretical value. The high thermal and chemical stability of PEM confirmed that the present solid PEM could be a great alternative to the liquid electrolyte having advantages of non-flammable, solvent free, flexible, light weight, low cost and easy processing.
Committee
Thein Kyu (Advisor)
Xiong Gong (Committee Member)
Zhenmeng Peng (Committee Member)
Pages
85 p.
Subject Headings
Polymer Chemistry
;
Polymers
Keywords
lithium ion battery solid polymer electrolyte membrane ionic conductivity
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Citations
Ren, ren, T. (2017).
FABRICATION AND EVALUATION ON ELECTROCHEMICAL PERFORMANCE OF SOLID POLYMER ELECTROLYTE MEMBREANE FOR LITHIUM-ION BATTERY
[Master's thesis, University of Akron]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=akron1495712448807722
APA Style (7th edition)
Ren, ren, tianli.
FABRICATION AND EVALUATION ON ELECTROCHEMICAL PERFORMANCE OF SOLID POLYMER ELECTROLYTE MEMBREANE FOR LITHIUM-ION BATTERY.
2017. University of Akron, Master's thesis.
OhioLINK Electronic Theses and Dissertations Center
, http://rave.ohiolink.edu/etdc/view?acc_num=akron1495712448807722.
MLA Style (8th edition)
Ren, ren, tianli. "FABRICATION AND EVALUATION ON ELECTROCHEMICAL PERFORMANCE OF SOLID POLYMER ELECTROLYTE MEMBREANE FOR LITHIUM-ION BATTERY." Master's thesis, University of Akron, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=akron1495712448807722
Chicago Manual of Style (17th edition)
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Document number:
akron1495712448807722
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© 2017, all rights reserved.
This open access ETD is published by University of Akron and OhioLINK.