Effect of Vanadium Oxide on the Structure and Li-Ion Conductivity of Lithium Silicate Glasses
authors Gaddam, A; Allu, AR; Ganisetti, S; Fernandes, HR; Stan, GE; Negrila, CC; Jamale, AP; Mear, F; Montagne, L; Ferreira, JMF
nationality International
journal JOURNAL OF PHYSICAL CHEMISTRY C
keywords ANISOTROPIC SHIELDING TENSORS; MAS NMR; RELATIVE ORIENTATION; CRYSTALLIZATION; AL; SPECTROSCOPY; SPECTRA; STATES; XPS; COORDINATION
abstract The commercially ubiquitous liquid electrolytes for lithium-ion batteries have several shortcomings in terms of safety. Therefore, development of solid electrolytes, especially those that are glass-based, has been gaining increasing interest in recent times. However, the fundamental understanding of the changes in the glass structure and the corresponding changes in the properties due to the addition of dopants is necessary for the development of glasses. Therefore, here, we report a study on the role of vanadium on the glass structure, ionic conduction, crystallization behavior, and other properties of lithium silicate-based glasses (23Li(2)O-2.64K(2)O-2.64Al(2)O(3)-71.72SiO(2)) as a solid electrolyte for high-temperature Li-ion battery applications. Furthermore, we proposed a mathematical model to describe/quantify the ion-conducting channels' connectivity in glasses. The experimental glass structures were assessed using Si-29, V-51, Al-27 nuclear magnetic resonance, Fourier transform infrared, and ultraviolet-visible spectroscopy techniques. The ionic conductivity was measured by impedance spectroscopy, and the crystallization behavior was studied by optical microscopy and X-ray diffraction. Furthermore, molecular dynamics simulations were also used to gain structural insights of the glasses. In the designed compositions, the addition of vanadium decreased the overall concentration of Li+ ions. However, the results revealed that the ionic conductivity improved with the addition of vanadium in spite of a decrease in the number of charge carriers. This suggests that vanadium makes the pathways easier for the conducting ions. Thus, we conclude that vanadium modifies the conduction channels to promote better hoping of the ions from one site to another.
publisher AMER CHEMICAL SOC
issn 1932-7447
isbn 1932-7455
year published 2021
volume 125
issue 30
beginning page 16843
ending page 16857
digital object identifier (doi) 10.1021/acs.jpcc.1c05059
web of science category 15
subject category Chemistry, Physical; Nanoscience & Nanotechnology; Materials Science, Multidisciplinary
unique article identifier WOS:000683810700053
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journal impact factor 4.189
5 year journal impact factor 4.404
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