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IJSTR >> Volume 9 - Issue 6, June 2020 Edition



International Journal of Scientific & Technology Research  
International Journal of Scientific & Technology Research

Website: http://www.ijstr.org

ISSN 2277-8616



The Effects of LiBOB and LiTFSI Compositions on the Conductivity of PVDF-HFP based Electrolyte Polymer Membrane for Lithium Ion Battery Applications

[Full Text]

 

AUTHOR(S)

T. Lestariningsih, Nurul H. Fithriyah, TY Hendrawati, Budiyanto, Wahyu B. Widayatno

 

KEYWORDS

Electrolyte polymer membranes, Ionic conductivity, LiBOB, LiTFSI, PVDF-HFP, and Solution casting,

 

ABSTRACT

This study is an effort to increase ionic conductivity of electrolyte polymer membranes in Lithium ion battery applications by combining electrolyte salts. An electrolyte polymer membrane functions as electrolytes and a separator. Such a membrane is made using a solution casting method at room temperature and consists of Polyvinylidene fluoride co-hexaflouropropylene (PVDF-HFP) as the polymer, titanium oxide (TiO2) as a filler, and combinations of Lithium bis(oxalate) borat (LiBOB) and Lithium bis-trifluoromethanesulfonimide (LiTFSI) as electrolyte salts. The electrolyte polymer membrane was characterized using Electrochemical Impedance Spectroscopy (EIS) for conductivity, X-Ray Diffractometer (XRD) for material crystallinity, and Scanning Electron Microscope (SEM) for surface morphology. The results of EIS tests show that the sample containing 23% LiTFSI and 5% LiBOB has the highest conductivity (2,35 x 10-6 S/cm) compared to the other samples. This finding is supported by the results from XRD, as well as SEM, analyses, in which the sample has the lowest crystallinity, which results in higher ionic mobility, and the formation of pores on the membrane surface with the diameter of ± 2-5 µm. The results of the 4th order polynomial regression analysis shows that increased LiTFSI corresponds to increased conductivity, however increased LiBOB corresponds to decreased conductivity

 

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