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Item type:Publication, Glass-Ceramic Na3+x[(Zr/Cr)x(Sc/Ti)2-x(PO4)3 Electrolyte Materials for Na-Ion Full-Cell Application(2023-01-01); Ravuri, Balaji RaoNa<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. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Improvement in fast Na-ion conduction in Na3+xCr xTi2−x(PO4)3 glass–ceramic electrolyte material for Na-ion batteries(2020-10-01); Abstract: In this report, efforts were made to investigate and characterize a variety of compositions in a glass system of general formula Na<inf>3+x</inf>Cr<inf>x</inf>Ti<inf>2−x</inf>(PO<inf>4</inf>)<inf>3</inf> (x = 0, 0.25, 0.5 and 0.75 mol%, designated as NCTP<inf>x</inf>) to optimize their properties for use in Na-ion batteries. Several crystalline phases such as Na<inf>3</inf>Ti<inf>2</inf>(PO<inf>4</inf>)<inf>3</inf> (COD-4106515) (NASICON), Cr<inf>2</inf>O<inf>3</inf> (ICSD-25781) and Cr(PO<inf>3</inf>)<inf>3</inf> (ICSD-39410) are precipitated during the process of crystallization. The microstructures of all the glass and glass–ceramic samples are analyzed using SEM and are correlated with powder XRD to explain the ionic conductivity for a given glass–ceramic sample. Single semicircle in the complex impedance plots clearly suggests that the present NCTP<inf>x</inf> glass samples exhibit a predominantly single-ion conduction mechanism. Electrical conductivity data follow the Arrhenius equation. The power-law exponent ‘s’ is observed to be the lowest (0.70) for the best conducting glass–ceramic sample NTCP<inf>0.5</inf> (4.24 × 10<sup>−4</sup> S/cm). The electrical modulus study proves that the conductivity relaxation of NCTP<inf>x</inf> glass–ceramic samples is temperature independent. Scaling behavior in the normalized spectra indicates that frequency-dependent relaxation behavior is unaffected by the temperature. Graphic abstract: [Figure not available: see fulltext.].