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Item type:Publication, PolyanionNaNi1 − xCuxPO4 glass and glass-ceramic cathode network: Structure with improved electrochemical performance(2024-07-01) - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Improved Na+ ion storage capacity of Na2O-Bi2O3 glass anode network: effect of TiO2 nanocrystals(2022-01-01); ; Dutta, Dimple P.This investigation highlights the influence of nanosized amorphous intermediate domains such as Na<inf>3</inf>Bi and Na<inf>2</inf>Ti on the electrochemical characteristics of the new Na<inf>2</inf>O-Bi<inf>2</inf>O<inf>3</inf> glass anode network mixed with TiO<inf>2</inf> nanocrystals. Amorphous domains (h-Na<inf>3</inf>Bi and h-Na<inf>2</inf>Ti) are indexed with hexagonal structures precipitated during the charging and discharging process, which might improve the high electrochemical performance of the glass anode network to a greater extent. The first discharge and charge capacities are recorded as 700 and 1060 mAh/g, respectively. Moreover, the Coulombic efficiency achieved is between 66 and 98% as the current rate varies from 0.1 C to 5 C. The value of R<inf>ct</inf> in the EIS spectra gradually decreases up to 500 cycles, indicating an increase in the electronic conductivity, eventually boosting the ionic conductivity. These results will create a potential interest to design and develop various glass and glass–ceramic anode networks to realize Na-ion technology for large-scale energy storage applications. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Mixed Polyanion Na-Mn-V-P Glass–Ceramic Cathode Network: Improved Electrochemical Performance and Stability(2021-02-01); This investigation demonstrates the electrochemical performance of glass and glass–ceramic NaMn<inf>1−x</inf>(VO)<inf>x</inf>PO<inf>4</inf> (x = 0.1, 0.3, 05, 0.7 mol%, and labeled as NM<inf>1−x</inf>V<inf>x</inf>P) cathode material system via phase details, structural illustration, electronic conductivity, and reversible capacity, etc. Pro-crystal calculation analysis is used to monitor Na<sup>+</sup> ion pathways’ migration for as-precipitated NaMnPO<inf>4</inf>, Na<inf>2</inf>MnP<inf>2</inf>O<inf>7</inf>, and NaVO<inf>3</inf> phases. The highest conductivity is achieved (≈5.92 × 10<sup>−7</sup> S cm<sup>−1</sup>) for the glass–ceramic sample having x = 0.3 mol% (NM<inf>0.7</inf>V<inf>0.3</inf>P) due to the lowest charge transfer resistance (R<inf>ct</inf>). Electrochemical measurements of the best conducting sample using coin half-cell exhibit two distinct voltage plateaus at 2 and 2.9 V versus Na/Na<sup>+</sup>, facilitating the active centers in two directions. The cyclability test of best-conducting NM<inf>0.7</inf>V<inf>0.3</inf>P glass–ceramic network exhibits adequate reversible capacity up to 97% of the specific capacity even up to 50 cycles, which satisfies its superior stability for longer durations.2 - 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.]. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Na–Ge glass anode network mixed with bismuth oxide nanocrystallites: A high capacity anode material for use in advanced sodium-ion battery design(2020-02-15); ; 2