A study on high rate and high stable sodium vanadium phosphate electrode for sodium battery alongside air exposure treatment

Diwakar, K.; Rajkumar, P.; Subadevi, R.; Arjunan, P.

doi:10.1007/s10854-021-05969-5

Cited by 7 publications

(6 citation statements)

References 30 publications

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“…Thus, the higher oxidation states arise due to the sodium deficient surface may enable more active sites for sodium during charge–discharge and enhance the rate capability and cycling stability. It may be noted that the binding energies at 1071.23, 133.36, and 531.31 eV are in good agreement with the reported values of Na 1s, P 2p, and O 1s, respectively. − The peak fitting for Na1s and P2p were done and displayed in Figure , while O 1s peak fitting analysis is provided in the Supporting Information as Figure S7, the fitting substantiates the oxidation state of P and Na was as expected in the undoped and doped NVP compositions. It may be noted that for all the samples apart from lattice oxygen, the surface hydroxide peak was also observed which could be responsible for the higher oxidation state of vanadium.…”

Section: Resultssupporting

confidence: 81%

Synergetic Effect of Isovalent- and Aliovalent-Ion Dual-Doping in the Vanadium Site of Na₃V₂(PO₄)₃ for Wide-Temperature Operating Sodium-Ion Batteries

Madambikkattil

Nair

Santhanagopalan

2022

ACS Appl. Energy Mater.

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NASICON-type vanadium-based cathodes have received significant attention due to the higher stability and theoretical capacity associated with polyanionic groups and vanadium redox-chemistry. However, improvements in structural stability and electronic conductivity to enhance the electrochemical performance are still a hot topic of research. In the present work, intrinsic modification in the vanadium site of Na3V2(PO4)3 (NVP) by dual-doping was investigated. The effect of dual-doping by isovalent Cr3+ and aliovalent Mg2+ ions in the vanadium site as Na3V2–x–y Cr x Mg y (PO4)3 (varying x and y = 0, 0.05, 0.1, and 0.15) was investigated. Among all the concentrations of doping, a concentration of 0.1 for both Cr and Mg showed a positive impact in capacity and rate performance as well as cycling compared to undoped and other doping conditions. The dual-doping significantly influences the particle size reduction, local lattice distortion, and populates higher valent V ions on the surface. These aspects synergistically help in reducing diffusion length, faster sodiation, and improved structural stability. Compared to the undoped and single-ion-doped NVP samples, the dual-doped NVP performed well. Dual-doped NVP exhibited 100 mA h/g at 25 mA/g and at 100 mA/g, 88% retention after 100 cycles. At the same time, at 250 mA/g, a specific capacity of 81.6 mA h/g for dual-doped NVP and a lower capacity of only 62.3 mA h/g for undoped NVP were recorded. Galvanostatic intermittent titration studies were also conducted to evaluate the kinetics. To establish the electrochemical performance of dual-doped NVP at different temperatures, electrochemical investigations were carried out at −10 °C and at 55 °C for comparison of its performance at 25 °C.

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Section: Resultssupporting

confidence: 81%

Synergetic Effect of Isovalent- and Aliovalent-Ion Dual-Doping in the Vanadium Site of Na₃V₂(PO₄)₃ for Wide-Temperature Operating Sodium-Ion Batteries

Madambikkattil

Nair

Santhanagopalan

2022

ACS Appl. Energy Mater.

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“…36 The carbon (C 1s) XPS spectrum is deconvoluted into three apparent peaks at 284.5, 286, and 289 eV corresponding to C�C, C−O, and −C�O, respectively (Figure 6f). 37…”

Section: Resultsmentioning

confidence: 99%

“…Figure d shows the P 2p peak at 133.25 eV, whereas the O 1s spectrum can be fitted in two peaks at energy levels of 517.03 and 523.35 eV corresponding to O –1 ions and O Chem , that is, chemically adsorbed oxygen on the surface (Figure e) . The carbon (C 1s) XPS spectrum is deconvoluted into three apparent peaks at 284.5, 286, and 289 eV corresponding to CC, C–O, and −CO, respectively (Figure f) …”

Section: Resultsmentioning

confidence: 99%

Highly Stable MWCNT@NVP Composite as a Cathode Material for Na-Ion Batteries

Kadam,

Kate,

Chothe

et al. 2023

ACS Appl. Mater. Interfaces

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A 3D framework with Nasicon structured polyanionic Na3V2(PO4)3 (NVP) has been emphasized as a leading cathode material for sodium-ion batteries (SIBs) due to its high working voltage plateau, structural stability, and good rate performance. Herein, pristine NVP and MWCNT@NVP composite synthesized via a facile solid-state method are examined and compared as cathode materials for Na-ion batteries. The morphological study confirms the uniform distribution of MWCNTs in the pristine NVP structure. Impedance spectroscopy clearly confirms more diffusion of Na ions for the MWCNT@NVP composite as compared to pristine NVP, considering its diffusion coefficient which directly implies on an increase in specific capacity. MWCNT@NVP (FNV-2) showed specific discharge capacity 110 mAhg-1 at 0.1C current rate which is almost stable at higher current rates with marginal fading. However, the pristine NVP shows capacity loss at a higher current rate. It is noteworthy that the MWCNT@NVP composite shows stable performance with marginal specific capacity fading (1%) compared to pristine (15%). This is because of the mechanical integrity and stability afforded to the composite by the intertwined MWCNT framework in the MWCNT@NVP composite matrix against electrode degradation during the electrochemical reaction. More significantly, even at a higher current rate, that is, at 10 C, the composite recorded a very stable and excellent Columbic efficiency of 97% with a reversible specific capacity of 94 mAhg–1 after 2000 cycles. An enhanced electrochemical performance, that is, rate capability and cycling stability, demonstrates the high potential of the MWCNT@NVP composite for Na-ion storage. Moreover, a sodium-ion full cell with hard carbon demonstrated a reversible capacity of 103 mAhg–1 at C/20 current rate, which clearly demonstrates that MWCNT@NVP is a promising cathode material for sodium-ion batteries.

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“…[ 89 ] However, the inherent local electrostatic of the positive ions becomes successively high, and electrochemical behavior remains unresolved. Because of their substantially outstanding electrochemical characteristics, simple V‐oxides layered cathodes and the corresponding polyanionic substances including Na 3 V 2 (PO 4 ) 2 F 3 [ 90 ] and Na 3 V 2 (PO 4 ) 3 [ 91 ] are two promising candidates. However, both still confront issues (viz., storage decay) in the course of actual implementation.…”

Section: Interlayer Engineering Regulationsmentioning

confidence: 99%

Advances of Metal Oxide Composite Cathodes for Aqueous Zinc‐Ion Batteries

Kumankuma-Sarpong

Guo

2022

Adv Energy and Sustain Res

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Aqueous zinc-ion batteries (AZIBs) lately garner a lot of interest and are viewed as a promising energy storage technology due to their low cost, eco-friendliness, and exceptional safety. Crystal metal oxide cathode research has advanced significantly in recent years, making AZIBs a viable choice for low-cost grid storage applications. However, the readily available (Mn-and V-based oxides) electrode materials suffer from instability and low conductivity. As a consequence, extensive study efforts are dedicated into the development and evaluation of high-performance cathode systems. Herein, advanced composite cathodes with modified structures are reviewed in an attempt to increase capacity and cycle life. The Mn-and V-based composite framework with polymer template, graphene, and MXene induces electric conductivity, improved lattice spacing, and tunable characteristics, as well as possible benefits for overcoming the redox kinetics and stability constraints for AZIBs. As a result, rational modification of the metal oxides as well as the production of composites shows promise in solving problems and improving cathode performance in high-performance AZIBs.

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A study on high rate and high stable sodium vanadium phosphate electrode for sodium battery alongside air exposure treatment

Cited by 7 publications

References 30 publications

Synergetic Effect of Isovalent- and Aliovalent-Ion Dual-Doping in the Vanadium Site of Na₃V₂(PO₄)₃ for Wide-Temperature Operating Sodium-Ion Batteries

Synergetic Effect of Isovalent- and Aliovalent-Ion Dual-Doping in the Vanadium Site of Na₃V₂(PO₄)₃ for Wide-Temperature Operating Sodium-Ion Batteries

Highly Stable MWCNT@NVP Composite as a Cathode Material for Na-Ion Batteries

Advances of Metal Oxide Composite Cathodes for Aqueous Zinc‐Ion Batteries

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A study on high rate and high stable sodium vanadium phosphate electrode for sodium battery alongside air exposure treatment

Cited by 7 publications

References 30 publications

Synergetic Effect of Isovalent- and Aliovalent-Ion Dual-Doping in the Vanadium Site of Na3V2(PO4)3 for Wide-Temperature Operating Sodium-Ion Batteries

Synergetic Effect of Isovalent- and Aliovalent-Ion Dual-Doping in the Vanadium Site of Na3V2(PO4)3 for Wide-Temperature Operating Sodium-Ion Batteries

Highly Stable MWCNT@NVP Composite as a Cathode Material for Na-Ion Batteries

Advances of Metal Oxide Composite Cathodes for Aqueous Zinc‐Ion Batteries

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Synergetic Effect of Isovalent- and Aliovalent-Ion Dual-Doping in the Vanadium Site of Na₃V₂(PO₄)₃ for Wide-Temperature Operating Sodium-Ion Batteries

Synergetic Effect of Isovalent- and Aliovalent-Ion Dual-Doping in the Vanadium Site of Na₃V₂(PO₄)₃ for Wide-Temperature Operating Sodium-Ion Batteries