Department of Physics

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Author: search.filters.author.Dalvi, AnshumanSubject: search.filters.subject.Spectroscopy

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    Li{sub 2}SO{sub 4}−Li{sub 2}O−P{sub 2}O{sub 5} ionic glass dispersed with [Bmim] [PF{sub 6}] ionic liquid: Electrical transport and thermal stability investigations
    (Office of Scientific and Technical Information, 2014) Dalvi, Anshuman
    A fast ionic composite is prepared by dispersion of Ionic liquid [Bmim][PF{sub 6}] in Li{sub 2}SO{sub 4}−Li{sub 2}O−P{sub 2}O{sub 5} glass matrix by mixing and through grinding. Amorphous/glassy nature of the samples is confirmed by X-Ray diffraction (XRD). Surprisingly, the electrical conductivity of the samples is found to be increasing by ∼ 2 orders of magnitude and exhibits typical Arrhenius behavior with low activation energy. DC polarization and impedance spectroscopy measurements suggest that samples are essentially ionic in nature. The conductivity isotherms were also obtained at different temperatures (T < 100 °C) and found to be appreciably stable at least for ∼ 10 days.
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    Synthesis of mixed ionic–electronic Li+–NASICON glass-ceramic nanocomposites for cathode applications
    (Springer, 2020-06) Dalvi, Anshuman
    A novel route for preparation of mixed ionic–electronic (MIE) glass-ceramics is proposed. Glass-ceramic nanocomposites are prepared by externally dispersing MIE glass viz. [Li2O]x-[V2O5-P2O5]100 − x (where x = 10 and 20 wt% with and the ratio of V2O5 and P2O5 has been kept to 9:1 and 3:1) in the NASICON-structured LiTi2(PO4)3 (LTP) matrix using mechanical milling-assisted synthesis route. After subjecting these glass-ceramic composites to suitable sintering temperature, the samples are structurally and electrically characterized using XRD, FESEM, and impedance spectroscopy. The maximum conductivity (100 °C) is found to be 5 × 10−5 Ω−1 cm−1 for an LTP-glass-ceramic composite, which is significantly higher than that of LTP. Impedance spectroscopy, electronic conductivity, and cyclic voltammetry scans strongly suggest simultaneous transport of ions and electrons. These composites exhibit thermal stability up to ~250 °C. These mixed conductors are found to be potential candidates as electrode/cathode materials in all-solid-state Li+ ion batteries.