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FABRICATION AND EVALUATION ON ELECTROCHEMICAL PERFORMANCE OF SOLID POLYMER ELECTROLYTE MEMBREANE FOR LITHIUM-ION BATTERY

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2017, Master of Science in Polymer Engineering, University of Akron, Polymer Engineering.
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.
Thein Kyu (Advisor)
Xiong Gong (Committee Member)
Zhenmeng Peng (Committee Member)
85 p.

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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)