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PolyanionNaNi1 − xCuxPO4 glass and glass-ceramic cathode network: Structure with improved electrochemical performance
(2024-07-01)
Grandhe, Radhika
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Katta, Vamsi Krishna
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Padala, Missak Swarup Raju
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Dutta, Dimple P.
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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+ 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
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Katta, Vamsi Krishna
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Jayasankar, C. K.
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Pecharapa, Wisanu
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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 × 10−04 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−1 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.
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Improved Na+ ion storage capacity of Na2O-Bi2O3 glass anode network: effect of TiO2 nanocrystals
(2022-01-01)
Yerranuka, Saritha Kumari
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Katta, Vamsi Krishna
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Mekprasart, Wanichaya
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Pecharapa, Wisanu
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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.
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Mixed Polyanion Na-Mn-V-P Glass–Ceramic Cathode Network: Improved Electrochemical Performance and Stability
(2021-02-01)
Katta, Vamsi Krishna
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Gandi, Suman
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Katari, Naresh Kumar
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Mekprasart, Wanichaya
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Pecharapa, Wisanu
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+ 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 × 10−7 S cm−1) 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+, 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.
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