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In-situ characterization of Li-ion battery electrodes using atomic force microscopy

Reddi, Rahul
http://orcid.org/0000-0001-8861-299X
http://rave.ohiolink.edu/etdc/view?acc_num=osu1524215477787917

Abstract Details

2018, Master of Science, Ohio State University, Mechanical Engineering.
The wetting of the electrodes due to liquid electrolyte used in Li-ion batteries can significantly impact the mechanochemical properties of polymer binders. To observe and characterize this, we employed in-situ atomic force microscopy (AFM) based force spectroscopy. Two different polymer binders for Si anodes, sodium (Na) alginate and polyvinylidene fluoride (PVdF), are immersed in a solution of di-methyl carbonate (DMC) and analyzed using a micro-cantilever with a Si tip, to mimic the actual Si – binder interface in Si anodes. Na-alginate is found to have orders of magnitude higher adhesive forces than PVdF after immersion in liquid electrolyte, which can be attributed to a functional carboxyl group in Na-alginate, possibly leading to a formation of hydrogen bonds and/or ion-dipole interaction with Si. In comparison PVdF demonstrates considerably weaker adhesive forces owing to Van der Waals’ interaction. It is also found that Na-alginate retains its mechanical strength better than PVdF in liquid electrolyte, by retaining more than 90% of its Youngs modulus, while the Young’s modulus of PVdF decreases to lower than 80% after immersion in electrolyte for 4 hours. Our nano-scale AFM analysis data agrees well with literature that are mostly based on macro-scale characterization. Furthermore, this study demonstrates the benefits of using force spectroscopy, AM-FM, and in-situ AFM techniques to characterize the evolution of interfaces between electrode components at a nano-scale under battery operating conditions.
Hanna Cho (Advisor)
Jung-Hyun Kim (Advisor)
72 p.
Mechanical Engineering
Li-ion batteries; Atomic force microscopy; in-situ characterization; surface morphology; Si anodes; adhesive forces of binders; Youngs modulus; PVdF; Na-Alginate

Recommended Citations

Citations

  • Reddi, R. (2018). In-situ characterization of Li-ion battery electrodes using atomic force microscopy [Master's thesis, Ohio State University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=osu1524215477787917

    APA Style (7th edition)

  • Reddi, Rahul. In-situ characterization of Li-ion battery electrodes using atomic force microscopy. 2018. Ohio State University, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=osu1524215477787917.

    MLA Style (8th edition)

  • Reddi, Rahul. "In-situ characterization of Li-ion battery electrodes using atomic force microscopy." Master's thesis, Ohio State University, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=osu1524215477787917

    Chicago Manual of Style (17th edition)

osu1524215477787917
748
© 2018, all rights reserved.
This open access ETD is published by The Ohio State University and OhioLINK.