High performance Na<sub>x</sub>CoO<sub>2</sub> as a cathode material for rechargeable sodium batteries

Reddy, B. Venkata Rami; Ravikumar, R.V.S.S.N.; Nithya, C.; Gopukumar, S.

doi:10.1039/c5ta03173g

Cited by 99 publications

(35 citation statements)

References 40 publications

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“…On the contrary, localized distribution of Na and Co in the MOF may have formed Na 2 O/Na 2 O 2 and Co 3 O 4 nanoparticles, which served as the precursors for NaCo x O y type materials at a high temperature of 700 °C for 24 h. Thus, in both cases, NaCo x O y formation was possible. For this reason, the PXRD pattern of NaCo x O y matched with the pattern of NaCo 2 O 4 36 with the absence of Na 2 O or Co 3 O 4 (Fig. S3 ).…”

Section: Resultsmentioning

confidence: 58%

Metal organic framework derived NaCoxOy for room temperature hydrogen sulfide removal

Gupta

Bae

Kim

2021

Sci Rep

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Novel NaCoxOy adsorbents were fabricated by air calcination of (Na,Co)-organic frameworks at 700 °C. The NaCoxOy crystallized as hexagonal microsheets of 100–200 nm thickness with the presence of some polyhedral nanocrystals. The surface area was in the range of 1.15–1.90 m2 g−1. X-ray photoelectron spectroscopy (XPS) analysis confirmed Co2+ and Co3+ sites in MOFs, which were preserved in NaCoxOy. The synthesized adsorbents were studied for room-temperature H2S removal in both dry and moist conditions. NaCoxOy adsorbents were found ~ 80 times better than the MOF precursors. The maximum adsorption capacity of 168.2 mg g−1 was recorded for a 500 ppm H2S concentration flowing at a rate of 0.1 L min−1. The adsorption capacity decreased in the moist condition due to the competitive nature of water molecules for the H2S-binding sites. The PXRD analysis predicted Co3S4, CoSO4, Co3O4, and Co(OH)2 in the H2S-exposed sample. The XPS analysis confirmed the formation of sulfide, sulfur, and sulfate as the products of H2S oxidation at room temperature. The work reported here is the first study on the use of NaCoxOy type materials for H2S remediation.

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Section: Resultsmentioning

confidence: 58%

Metal organic framework derived NaCoxOy for room temperature hydrogen sulfide removal

Gupta

Bae

Kim

2021

Sci Rep

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“…This finding is in good correlation with the slight interlayer contraction combined with the increasing amount of Na. Scarce data are available on Na + mobility in sodiated oxides and bronzes, with very close values in the range 10 −12 –10 −10 cm 2 s −1 reported for Na 0.33 V 2 O 5 ,, Na x CoO 2 , and P2‐Na 0.67 MnO 2 …”

Section: Resultsmentioning

confidence: 99%

Bilayered Potassium Vanadate K_0.5V₂O₅ as Superior Cathode Material for Na‐Ion Batteries

et al. 2019

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A bilayered potassium vanadate K0.5V2O5 (KVO) is synthesized by a fast and facile synthesis route and evaluated as a positive electrode material for Na‐ion batteries. Half the potassium ions can be topotactically extracted from KVO through the first charge, allowing 1.14 Na+ ions to be reversibly inserted. A good rate capability is also highlighted, with 160 mAh g−1 at C/10, 94 mAh g−1 at C/2, 73 mAh g−1 at 2C and excellent cycling stability with 152 mAh g−1 still available after 50 cycles at C/10. Ex situ X‐ray diffraction reveals weak and reversible structural changes resulting in soft breathing of the KVO host lattice upon Na extraction–insertion cycles (ΔV/V≈3 %). A high structure stability upon cycling is also achieved, at both the long‐range order and atomic scale probed by Raman spectroscopy. This remarkable behavior is ascribed to the large interlayer spacing of KVO (≈9.5 Å) stabilized by pillar K ions, which is able to accommodate Na ions without any critical change to the structure. Kinetics measurements reveal a good Na diffusivity that is hardly affected upon discharge. This study opens an avenue for further exploration of potassium vanadates and other bronzes in the field of Na‐ion batteries.

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“…Since sodium is the most abundant alkali metal element in the earth's crust, sodium‐ion batteries having working principles and performance similar to those of their lithium‐ion counterparts could be regarded as a possible replacement for the current lithium‐ion batteries . So far, the designs for sodium‐ion cathode host materials have been borrowed from their well‐known lithium equivalents.…”

Section: Introductionmentioning

confidence: 99%

Effects of Mn‐Doping on the Structural and Electrochemical Properties of Na₃Ni₂SbO₆ for Sodium‐Ion Battery.

Kee

Put

Dimov

et al. 2020

Batteries & Supercaps

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Recently, layered O'3-Na 3 Ni 2 SbO 6 has been investigated as a unique cathode material for Na-ion batteries due to the good electrochemical performance via O'3-P'3 phase transitions in the voltage range between 2.0 and 4.0 V vs Na + /Na. However, at present it is not well understood whether transition metal doping of the pristine structure could improve the phase transition kinetics during charge/discharge. In this study, we synthesized Mn-doped Na 3 Ni 2-x Mn x SbO 6 (x = 0, 0.25, 0.5) layered oxides and investigated their feasibility as cathode materials for Na-ion batteries using ex-situ X-ray diffraction (XRD) coupled with DFT calculations. The results show that light Mn doping (x = 0.25) energetically enhances the O'3-P'3 phase transition kinetics with smaller unit-cell-volume changes. However, the heavily doped (x = 0.5) sample suffers from large polarization, which could be attributable to the reduced two-phase reaction range and a large unit-cell-volume change upon sodium extraction.[a] Dr.

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High performance Na_xCoO₂ as a cathode material for rechargeable sodium batteries

Abstract: A high performance NaxCoO2 cathode material for sodium ion batteries has been synthesized using a sol–gel combustion technique using glycine as a chelating agent.

Cited by 99 publications

References 40 publications

Metal organic framework derived NaCoxOy for room temperature hydrogen sulfide removal

Metal organic framework derived NaCoxOy for room temperature hydrogen sulfide removal

Bilayered Potassium Vanadate K_0.5V₂O₅ as Superior Cathode Material for Na‐Ion Batteries

Effects of Mn‐Doping on the Structural and Electrochemical Properties of Na₃Ni₂SbO₆ for Sodium‐Ion Battery.

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High performance NaxCoO2 as a cathode material for rechargeable sodium batteries

Abstract: A high performance NaxCoO2 cathode material for sodium ion batteries has been synthesized using a sol–gel combustion technique using glycine as a chelating agent.

Cited by 99 publications

References 40 publications

Metal organic framework derived NaCoxOy for room temperature hydrogen sulfide removal

Metal organic framework derived NaCoxOy for room temperature hydrogen sulfide removal

Bilayered Potassium Vanadate K0.5V2O5 as Superior Cathode Material for Na‐Ion Batteries

Effects of Mn‐Doping on the Structural and Electrochemical Properties of Na3Ni2SbO6 for Sodium‐Ion Battery.

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Product

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High performance Na_xCoO₂ as a cathode material for rechargeable sodium batteries

Bilayered Potassium Vanadate K_0.5V₂O₅ as Superior Cathode Material for Na‐Ion Batteries

Effects of Mn‐Doping on the Structural and Electrochemical Properties of Na₃Ni₂SbO₆ for Sodium‐Ion Battery.