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Thesis Yu Gu yxg499@case.edu.pdf (4.02 MB)

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A PVDF-BASED HYBRID ELECTROLYTE INCORPORATING LATP AND Al2O3 FILLERS WITH ENHANCED IONIC CONDUCTIVITY AND THERMAL STABILITY FOR LI-ION BATTERIES

Gu, Yu
http://orcid.org/0000-0002-4350-8459
http://rave.ohiolink.edu/etdc/view?acc_num=case1618903524872759

Abstract Details

2021, Master of Sciences, Case Western Reserve University, EMC - Mechanical Engineering.
At high temperatures, polymer separators in conventional Li-ion Batteries are prone to melt, fail to separate the electrodes, and cause internal short circuits. A PVDF-based hybrid electrolyte with Li1.3Al0.3Ti1.7(PO4)3 (LATP) and Al2O3 filler, prepared with NMP/glycerol dual solvents by slurry coating is reported in this thesis. The effects of fillers and glycerol on the ionic conductivity of the hybrid electrolyte membrane are studied. It was found that the use of glycerol and Al2O3 nanoparticles can increase the hybrid electrolyte’s ionic conductivity. The dual-solvent prepared sample with a specific composition of PVDF/LATP/Al2O3=3/6/1 shows the highest ionic conductivity of 1.39 mS/cm, which is 30% higher than the sample without Al2O3. The membrane also exhibits better thermal stability compared to a Celgard 2325 commercial polymer separator. Li//Li symmetrical cell assembled using the prepared membrane shows excellent stability. In NMC half-cell cycling tests, capacity retention of 92.8% and 92.1 % are achieved on 50 cycles at 0.5 C and 1 C, respectively.
Chris Yuan (Advisor)
Bo Li (Committee Member)
Burcu Gurkan (Committee Member)
71 p.
Engineering
Hybrid Electrolyte; LATP; Li-ion Battery; Separator; SEM; TGA; PVDF; Al2O3 nanoparticle; Glycerol

Recommended Citations

Citations

  • Gu, Y. (2021). A PVDF-BASED HYBRID ELECTROLYTE INCORPORATING LATP AND Al2O3 FILLERS WITH ENHANCED IONIC CONDUCTIVITY AND THERMAL STABILITY FOR LI-ION BATTERIES [Master's thesis, Case Western Reserve University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=case1618903524872759

    APA Style (7th edition)

  • Gu, Yu. A PVDF-BASED HYBRID ELECTROLYTE INCORPORATING LATP AND Al2O3 FILLERS WITH ENHANCED IONIC CONDUCTIVITY AND THERMAL STABILITY FOR LI-ION BATTERIES. 2021. Case Western Reserve University, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=case1618903524872759.

    MLA Style (8th edition)

  • Gu, Yu. "A PVDF-BASED HYBRID ELECTROLYTE INCORPORATING LATP AND Al2O3 FILLERS WITH ENHANCED IONIC CONDUCTIVITY AND THERMAL STABILITY FOR LI-ION BATTERIES." Master's thesis, Case Western Reserve University, 2021. http://rave.ohiolink.edu/etdc/view?acc_num=case1618903524872759

    Chicago Manual of Style (17th edition)

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This open access ETD is published by Case Western Reserve University School of Graduate Studies and OhioLINK.