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Fabrication and characterizations of lithium aluminum titanate phosphate solid electrolytes for Li-based batteries

Yaddanapudi, Anurag
http://rave.ohiolink.edu/etdc/view?acc_num=wright1547044605448066

Abstract Details

2018, Master of Science in Materials Science and Engineering (MSMSE), Wright State University, Materials Science and Engineering.
Demands for electric vehicles and flexible electronics have escalated research in developing high-performance lithium batteries based on solid-state chemistry. The present work is to develop highly-conductive and flexible solid electrolyte for such applications. Lithium aluminum titanate phosphate (LATP or Li1.3Al0.3Ti1.7(PO4)3), both in ceramic pellets and free-standing composite membranes, have been fabricated. The crystal structure, surface morphology, and ionic conductivity are systematically studied. LATP pellets are prepared using solid state reaction approach. The results indicate that calcine temperature has significant impacts on the phase impurity and sintering temperature and duration have more impacts on the grain size and porosity of LATP pellets. At the optimal conditions, the highest bulk conductivity of LATP electrolyte reaches 1.5*10-3 S/cm at room temperature with an activation energy of 0.206 eV. The as-prepared LATP has high conductivities comparable with liquid electrolytes, which is feasible for applications to all-solid-state lithium batteries. Ceramic electrolyte can be composited with polymer electrolyte to enable flexible battery design. In this study, LATP-based electrolyte membranes are fabricated in composite with a lithiated polymer, i.e. polyvinylidene fluoride (PVDF) dissolved with lithium perchlorate (LiClO4), via the casting method. It is found curing temperature has influences on ionic conductivities of the composite membrane and high casting temperature can cause the decomposition of PVDF. Appropriate LATP composition can increase the ionic conductivity, mechanical strength while maintaining the flexibility of the composite membrane. Raman spectroscopic analysis suggests there exists certain interactions among the three components in the composite membrane.
Hong Huang, Ph.D. (Advisor)
Michael Rottmayer, Ph.D. (Committee Member)
Amir A. Farajian, Ph.D. (Committee Member)
99 p.
Materials Science; Mechanical Engineering; Metallurgy; Polymers
electric vehicles; flexible electronics; lithium batteries; Lithium aluminum titanate phosphate; LATP

Recommended Citations

Citations

  • Yaddanapudi, A. (2018). Fabrication and characterizations of lithium aluminum titanate phosphate solid electrolytes for Li-based batteries [Master's thesis, Wright State University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=wright1547044605448066

    APA Style (7th edition)

  • Yaddanapudi, Anurag. Fabrication and characterizations of lithium aluminum titanate phosphate solid electrolytes for Li-based batteries. 2018. Wright State University, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=wright1547044605448066.

    MLA Style (8th edition)

  • Yaddanapudi, Anurag. "Fabrication and characterizations of lithium aluminum titanate phosphate solid electrolytes for Li-based batteries." Master's thesis, Wright State University, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=wright1547044605448066

    Chicago Manual of Style (17th edition)

wright1547044605448066
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© 2018, all rights reserved.
This open access ETD is published by Wright State University and OhioLINK.