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Physical and electrochemical investigation of various dinitrile plasticizers in highly conductive polymer electrolyte membranes for lithium ion battery application

Feng, Chenrun
http://rave.ohiolink.edu/etdc/view?acc_num=akron1495737492563488

Abstract Details

2017, Master of Science, University of Akron, Polymer Engineering.
To investigate physical and electrochemical properties of polymer electrolyte membranes (PEMs) containing various dinitriles such as succinonitrile (SCN), glutaronitrile (GLN) and adiponitrile (ADN), binary and ternary phase diagrams of poly(ethylene glycol) diacrylate (PEGDA), GLN and lithium bis(trifluoromethanesulfonyl)imide (LiTFSI) blends were firstly established in this thesis. The binary phase diagram of PEGDA/GLN system was self-consistently solved based on the combined free energies of Flory-Huggins theory for liquid-liquid demixing and phase field theory for crystal solidification. Computed liquidus and solidus lines were compared with crystal melting temperatures of the binary pairs, obtained by differential scanning calorimetry (DSC) measurement. The binary phase diagram of LiTFSI/GLN system was drawn according to crystal melting temperatures of the binary pairs determined by DSC measurement. Then coexistence regions of each binary phase diagram were verified by polarized optical microscopy. Subsequently, the ternary phase diagram of PEGDA/GLN/LiTFSI at 25 oC were established. Guided by isotropic regions within ternary phase diagrams established in this thesis and previous studies, polymer electrolyte membranes (PEMs) plasticized by various dinitriles thus fabricated via photo-polymerization afforded transparent, homogeneous films. The ionic conductivity of these PEMs was determined by AC impendence spectrometer, which showed high ionic conductivity up to 10-3 S/cm at room temperature. Of particular interest is that GLN-PEM reveals the highest ion conductivity among the three PEMs tested. To analyze the electrochemical performance of PEMs used in lithium-ion batteries, SCN-PEM, GLN-PEM, and ADN-PEM were assembled into Li4Ti5O12/PEM/Li and LiFePO4/PEM/Li half-cells. The half-cell containing GLN-PEM exhibits the best charge-discharge cycling performance, which is consistent with the highest ionic conductivity of the GLN plasticized PEM.
Thein Kyu (Advisor)
Xiong Gong (Committee Chair)
Zhenmeng Peng (Committee Member)
96 p.
Engineering; Polymers
polymer electrolyte membrane; plasticizer; glutaronitrile; adiponitrile; succinonitrile; half-cell; lithium ion battery; phase diagram

Recommended Citations

Citations

  • Feng, C. (2017). Physical and electrochemical investigation of various dinitrile plasticizers in highly conductive polymer electrolyte membranes for lithium ion battery application [Master's thesis, University of Akron]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=akron1495737492563488

    APA Style (7th edition)

  • Feng, Chenrun. Physical and electrochemical investigation of various dinitrile plasticizers in highly conductive polymer electrolyte membranes for lithium ion battery application. 2017. University of Akron, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=akron1495737492563488.

    MLA Style (8th edition)

  • Feng, Chenrun. "Physical and electrochemical investigation of various dinitrile plasticizers in highly conductive polymer electrolyte membranes for lithium ion battery application." Master's thesis, University of Akron, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=akron1495737492563488

    Chicago Manual of Style (17th edition)

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This open access ETD is published by University of Akron and OhioLINK.