Department of Pharmacy

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    Li+ NASICON nanocrystallites in ionic glasses: A potential nano composite system for all-solid-state Li+ ion batteries
    (AIP, 2019-07) Dalvi, Anshuman
    In order to prepare a suitable oxide based solid electrolyte for Li+ ion batteries, Li+ NASICON LATP nanocrystallites [LiAl0.3Ti1.7(PO4)3] have been externally dispersed in fast ionic oxide glassy system, viz, 60[Li2SO4]-40[Li2O-P2O5]. To prepare this novel composite, milling assisted synthesis route was adopted in which ionic glass and LATP were separately ball milled, subsequently mixed and pelletized. The present work reports that even for a very small amount of LATP (1 wt%) in the mixture, the conductivity exhibits a significant enhancement. Structural and electrical properties of the composite with a typical composition of 1%(LATP)-99%(60LSLP) have been reported. X-ray diffraction confirmed that milling leads to reduction in the size of both the glass grains and the LATP crystallites. These novel composites have been found to be potential candidates for all solid-state battery applications
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    Na3Zr2Si2PO12-Polymer Hybrid Composites for Solid-State Supercapacitor Applications
    (IOP, 2020) Dalvi, Anshuman
    Various Na+ ions conducting composite polymer electrolytes have been developed in last three decades, but their application is limited due to poor ionic conductivity near room temperature. Recently, we have demonstrated high ionic conductivity of ∼ 10-4 Ω-1cm-1 in NASICON-polymer hybrids and found these systems useful in energy storage applications. A high ionic mobility of ~ 10-1 cm2/V-s was also reported. Present work shows a possible application of these hybrids as electrolyte/separator in all-solid-state supercapacitor. In this work, Na+ NASICON, viz. Na3Zr2Si2PO12 (NZSP) have been prepared by conventional solid state reaction route. Subsequently, their nanoparticles of size ~ 30 nm were obtained via mechanical ball milling. The nanoparticles were mixed with polymer in a ball mill until a homogeneous viscous slurry formation. Further the slurry was dried, hot pressed at ~ 80°C to obtain films of uniform thickness ~ 250µm. This way, composite films with composition (wt%) 10NaI-90(PEO1-xNZSPx), where 0 ≤ x ≤ 0.4, were obtained. Surface morphology, structural and thermal analysis were characterized using FESEM, XRD and DSC. A maximum ionic conductivity of ~ 4 x 10-5 Ω-1cm-1 at room temperature has been achieved for composite with x = 0.4. Impedance spectroscopy was used to understand mechanism of ionic transport. Further, to understand the role of ceramic fillers in enhancing the ionic conductivity, local structure of the composites was studied using x-ray absorption near edge structure spectroscopy (XANES) at Indus II Beamline 01, RRCAT, Indore. These results suggest a significant role of NASICON in providing pathways for Na+ ion transport.
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    Structural and conductivity studies on ionic liquid confined lithium silicate glasses prepared by sol-gel route
    (IAEA, 2018) Dalvi, Anshuman; Sivasubramanian, S.C.
    Electrical conductivity and ionic mobility measurements suggests that salt ions (probably Li+ ions) dominate the ionic transport. The cations and anions of IL do not contribute to long range migration, due to their bigger size and narrow channels/ pathways available in the glass-matrix. Studies to understand the effect of IL's counterion on conducting properties of the prepared glass composites are in progress
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    Understanding of ionic transport in Ntp dispersed Na+ ion hybrid polymer nanocomposites using Xanes spectroscopy
    (International Atomic Energy Agency, 2018) Dalvi, Anshuman
    Present investigation focuses on conductivity-structure correlation in NaTi2(PO4)2 (NTP) NASICON embedded novel hybrid polymer composites. Structural and electrical investigations suggest that for low NTP content salt ions prefer to move through polymer for electrical transport. However, for higher content, the surfaces as well as inner states of NTP crystallites facilitate the ionic conduction as suggested earlier also