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Author: search.filters.author.Katta, Vamsi KrishnaSubject: search.filters.subject.Sodium-ion battery

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    PolyanionNaNi1 − xCuxPO4 glass and glass-ceramic cathode network: Structure with improved electrochemical performance
    (2024-07-01)
    Grandhe, Radhika
    ;
    Katta, Vamsi Krishna
    ;
    Padala, Missak Swarup Raju
    ;
    Dutta, Dimple P.
    ;
    WisanuPecharapa
    PolyanionNaNi<inf>1 − x</inf>Cu<inf>x</inf>PO<inf>4</inf> glass and glass-ceramic networks are prepared by Melt-quenching and after heat treated for 5 h at its T<inf>c</inf>, regarded as probable cathode composite material for Na-ion batteries (SIBs). The intensity variations arrived from XRD traces, revealed that the phases NaNi<inf>4</inf>(PO<inf>4</inf>)<inf>3</inf> (ICSD 60-964), NaCu(PO<inf>4</inf>) (ICSD 581-303), and Na<inf>2</inf>CuNi(PO<inf>4</inf>)<inf>2</inf> (ICSD 20-22594) which are precipitated during heat treatment is primarily caused by the partial substitution of tetrahedral PO<inf>4</inf> and CuO<inf>6</inf> sites with NiO<inf>6</inf> structural active sites in the glass-ceramic network resulting to accommodate sudden volume changes, and therefore diffusion of Na<sup>+</sup> ions will be improved along with fast rate capability and voltage for longer durations as reflected in SEM image analysis. The cyclic voltammogram of half-cell of best conducting NaNi<inf>0.3</inf>Cu<inf>0.7</inf>PO<inf>4</inf> glass-ceramic cathode with a voltage range of 0.2 to 4 V and 100 V/S cycles noted to achieve lowest cell polarization (0.41 V) with best capacity retention of discharge (96%) up to 1000 cycles. Graphical abstract: (Figure presented.)
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    Glass-Ceramic Na3+x[(Zr/Cr)x(Sc/Ti)2-x(PO4)3 Electrolyte Materials for Na-Ion Full-Cell Application
    (2023-01-01)
    Gandi, Shyam Sundar
    ;
    Katta, Vamsi Krishna
    ;
    Jayasankar, C. K.
    ;
    Pecharapa, Wisanu
    ;
    Ravuri, Balaji Rao
    Na<inf>3+x</inf>[(Zr/Cr)<inf>x</inf>(Sc/Ti)<inf>2-x</inf>(PO<inf>4</inf>)<inf>3</inf>] glass-ceramic material compositions containing NASICON-type crystalline phases might be a good candidate as an efficient electrolyte exclusively for Na-ion batteries. All-solid-state Na-ion full cells are designed with the three-layered pellets (NaCo<inf>0.7</inf>(VO)<inf>0.3</inf>PO<inf>4</inf>/Na<inf>3.5</inf>Zr<inf>0.5</inf>Sc<inf>1.5</inf>(PO<inf>4</inf>)<inf>3</inf> (NZSP) and Na<inf>3.5</inf>Cr<inf>0.5</inf>Ti<inf>1.5</inf>(PO<inf>4</inf>)<inf>3</inf>) (NCTP)/Na-metal foil). The electrical conductivity of the NZSPglass-ceramic powder sample achieves to be highest (9.47 × 10<sup>−04</sup> S/cm) due to its lower grain boundary resistance (R <inf>gb</inf>) as observed in SEM images and also exhibits best electrochemical stability against conductivity when the samples kept in ambient air for 60 d. The charge/discharge capacities for the initial cycle are 75/69 and 60/53 mAhg<sup>−1</sup> to both NZSP and NCTP of two full cells, respectively. However, discharge capacities are boosted up for both these cells without much loss in coulombic efficiency even after 10 cycles.