Ionic conductivity and Raman investigations on the phase transformations of Na4P2O7

Gangadharan, Raje; Kalaiselvi, Jayaraman; Shanmukaraj, Devaraj; Palanivel, B.; Mohan, S.; Murugan, Ramaswamy

doi:10.1016/s0925-8388(02)00046-4

Cited by 19 publications

(9 citation statements)

References 9 publications

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“…Synthesis of sodium diphosphate has been reported by several authors [1,2,[5][6][7]. The synthesis was carried out by heating different precursors at various temperatures.…”

Section: Introductionmentioning

confidence: 99%

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Standard enthalpy of formation of disodium hydrogen phosphate hexahydrate and sodium diphosphate

Khaled

Khattech

Jemal

2011

The Journal of Chemical Thermodynamics

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“…Synthesis of sodium diphosphate has been reported by several authors [1,2,[5][6][7]. The synthesis was carried out by heating different precursors at various temperatures.…”

Section: Introductionmentioning

confidence: 99%

“…The synthesis was carried out by heating different precursors at various temperatures. According to Gangadharam et al [5] this product could be obtained by heating sodium diphosphate decahydrate (Na 4 P 2 O 7 Á10H 2 O) up to 150°C with a heating rate of 1°C Á min À1 . Then the product is maintained at that temperature for a long time.…”

Section: Introductionmentioning

confidence: 99%

Standard enthalpy of formation of disodium hydrogen phosphate hexahydrate and sodium diphosphate

Khaled

Khattech

Jemal

2011

The Journal of Chemical Thermodynamics

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“…37 The diphosphate ion consists of two PO 4 tetrahedra with a central P−O−P linkage. 38 The Raman shift at 1037 cm −1 In Figure 2o, we show the high-resolution image for the NCPP sample where the extracted interlayer distance was found to be 0.55 nm for (011) reflection and 0.34 for (402) reflection. Figure 2q shows the N-doped carbon spheres surrounded by the NCPP sheet, and the high-magnification image in Figure 2r indicates the surface boundary of NCPP and N-doped carbon spheres.…”

Section: Resultsmentioning

confidence: 99%

Na₄Co₃(PO₄)₂P₂O₇/NC Composite as a Negative Electrode for Sodium-Ion Batteries

Dwivedi

Sapra

Pati

et al. 2021

ACS Appl. Energy Mater.

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In recent years, the mixed phosphate-based polyanionic electrode materials have attracted great attention in sodium-ion batteries (SIBs) due to their structural stability during cycling and open framework for ion diffusion. Here, we report the electrochemical performance of a Na 4 Co 3 (PO 4 ) 2 P 2 O 7 /nitrogen-doped carbon (NCPP/NC) composite as a negative electrode (anode) for SIBs in the working potential range of 0.01−3.0 V. It delivers a reversible discharge capacity of 250 mA h g −1 at 0.5 C current rate, which corresponds to the insertion/extraction of four sodium ions. The rate capability study indicates the reversible mechanism and highly stable capacity (61 mA h g −1 ) even at a high rate of up to 5 C as compared to pristine NCPP. The incorporation of the N-doped carbon spheres in the composite is expected to enhance the electronic/ionic conductivity, which plays an important role in improving the performance and stability up to 400 cycles at 1 C rate. Intriguingly, the analysis of cyclic voltammetry data measured at different scan rates confirms the capacitive/diffusive-controlled mechanism, and the extracted diffusion coefficient is found to be around 10 −10 cm 2 s −1 . Our results demonstrate that the NCPP/NC composite is also a potential candidate as an anode in SIBs due to its three-dimensional framework, cost effectiveness, enhanced specific capacity, and further possibility of improving the stability.

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“…The peaks appear in the range of 300 cm −1 to 1200 cm −1 con- sistent with the internal modes of P 2 O 7 [37]. The diphosphate ion consists of two PO 4 tetrahedra with a central P-O-P linkage [38]. The Raman shift at 1037 cm −1 corresponds to stretching mode of PO 4 group, peaks appear at 715 and 952 cm −1 correspond to bridging mode of PO 4 .…”

Section: Resultsmentioning

confidence: 99%

“…The Raman shift at 1037 cm −1 corresponds to stretching mode of PO 4 group, peaks appear at 715 and 952 cm −1 correspond to bridging mode of PO 4 . The peak present at 343 cm −1 indicates the deformation of P-O-P bond [38]. The detailed microstructures of the as-synthesized N doped carbon spheres, NCPP and NCPP/NC samples are characterized using FE-SEM and results are displayed in Figs.…”

Section: Resultsmentioning

confidence: 99%

Na$_{4}$Co$_{3}$(PO$_{4}$)$_{2}$P$_{2}$O$_{7}$/NC composite as a negative electrode for sodium-ion batteries

Dwivedi¹,

Sapra²,

Pati³

et al. 2021

Preprint

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In recent years, the mixed phosphates based polyanionic electrode materials have attracted great attention in sodium-ion batteries due to their structural stability during cycling and open framework for ion diffusion. Here, we report the electrochemical performance of Na4Co3(PO4)2P2O7/nitrogen doped carbon (NCPP/NC) composite as a negative electrode (anode) for sodium ion batteries in the working potential range of 0.01-3.0 V. It delivers a reversible discharge capacity of 250 mAhg −1 at 0.5 C current rate, which corresponds to the insertion/extraction of four sodium ions. The rate capability study indicates the reversible mechanism and highly stable capacity (61 mAhg −1 ) even at high rate up to 5 C as compared to pristine NCPP. The incorporation of the N doped carbon spheres in the composite is expected to enhance the electronic/ionic conductivity, which plays an important role in improving the performance and stability up to 400 cycles at 1 C rate. Intriguingly, the analysis of cyclic voltammetry data measured at different scan rates confirm the capacitive/diffusive controlled mechanism and the extracted diffusion coefficient is found to be around 10 −10 cm 2 s −1 . Our results demonstrate that the NCPP/NC composite is also a potential candidate as anode in sodium-ion batteries due to its three dimensional framework, cost effectiveness, enhanced specific capacity as well as further possibility of improving the stability.

show abstract

Ionic conductivity and Raman investigations on the phase transformations of Na4P2O7

Cited by 19 publications

References 9 publications

Standard enthalpy of formation of disodium hydrogen phosphate hexahydrate and sodium diphosphate

Standard enthalpy of formation of disodium hydrogen phosphate hexahydrate and sodium diphosphate

Na₄Co₃(PO₄)₂P₂O₇/NC Composite as a Negative Electrode for Sodium-Ion Batteries

Na$_{4}$Co$_{3}$(PO$_{4}$)$_{2}$P$_{2}$O$_{7}$/NC composite as a negative electrode for sodium-ion batteries

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Ionic conductivity and Raman investigations on the phase transformations of Na4P2O7

Cited by 19 publications

References 9 publications

Standard enthalpy of formation of disodium hydrogen phosphate hexahydrate and sodium diphosphate

Standard enthalpy of formation of disodium hydrogen phosphate hexahydrate and sodium diphosphate

Na4Co3(PO4)2P2O7/NC Composite as a Negative Electrode for Sodium-Ion Batteries

Na$_{4}$Co$_{3}$(PO$_{4}$)$_{2}$P$_{2}$O$_{7}$/NC composite as a negative electrode for sodium-ion batteries

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Na₄Co₃(PO₄)₂P₂O₇/NC Composite as a Negative Electrode for Sodium-Ion Batteries