Composites of nanodimensional glass in the system Na2O–SiO2/Mesoporous silica and their high ionic conductivity

Samanta, Subha; Maity, Anupam; Chatterjee, S.; Giri, S.; Chakravorty, D.

doi:10.1016/j.jpcs.2020.109470

Cited by 11 publications

(21 citation statements)

References 41 publications

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“…The method for synthesizing surfactant–modified SBA-15 (Santa Barbara Amorphous-15) was similar to the method in the literature reported earlier. 41 To fabricate the target composition x CoO·(20 − x )NiO·80SiO 2 , three different solutions were prepared by mixing ethanol with the calculated proportions of cobalt nitrate, nickel nitrate and TEOS and stirred separately for 1 hour at ambient temperature. All these solutions were mixed and then stirred vigorously at ambient temperature for 6 hours to obtain a homogenous sol.…”

Section: Methodsmentioning

confidence: 99%

Crossover of positive and negative magnetoconductance in composites of nanosilica glass containing dual transition metal oxides

et al. 2021

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Section: Methodsmentioning

confidence: 99%

Crossover of positive and negative magnetoconductance in composites of nanosilica glass containing dual transition metal oxides

et al. 2021

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“…The dissimilarities in the stoichiometric ratios of nNa/nSi and nP/nSi are attributed to the heterogeneous microstructure as exhibited by electron beam scanning during EDAX analysis. 47 In order to better understand the material and to obtain a pictorial insight of the nanocomposite-1, we had carried out the EDAX mapping analysis of the NGC1 sample. shows the area of nanocomposite-1 subjected to elemental mapping, and Figure 6b−e shows the relative positional stoichiometric occupancies of the constituent elements Na, P, Si, and O, respectively.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

“…For further exploitation as the promising electrode candidate in the solid-state battery system, we evaluated the electrochemical performances of our samples using the conventional two-electrode system. 47 Typical cyclic voltammetry (CV) measurements for nanocomposite-1 and nanocomposite-2 were carried out within a voltage window of −5 to +5 V with a wide variation in scan rates.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

“…67−69 In addition, NGC2 exhibits enhanced electrode/electrolyte interface areas, providing high electroactive regions. 47,67 In Figure 14(a), a pair of well-defined and symmetric redox response appear due to the intercalation and de-intercalation of Na + ion. 70,71 The peak potential shifts towards higher values for NGC2 (∼3 V) compared to both NGC1 (∼1.7 V) and NC (∼1.5 V) indicating enhanced redox reactivity within the material.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

“…Our recent investigations on silicate-based glasses containing Na + ions within a nanodimensional SBA-15 template revealed high electrical conductivity at room temperature ascribed to the free volume effect at nanoglass interfaces with the mesoporous silica template. 47 Scientists were always optimistic about the discovery of materials exhibiting high ionic conductivity at room temperature. A study on nanosized Na 3 PS 4 solid electrolyte revealed that an ionic conductivity of 8.44 × 10 −5 S•cm −1 at room temperature with high energy density is attributed to good interface compatibility.…”

Section: ■ Introductionmentioning

confidence: 99%

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Effect of Microstructure on Ionic Transport in Silica-Based Sodium Containing Nanoconfined Systems and Their Electrochemical Performance as Electrodes

et al. 2020

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Glasses having compositions xNa2O·10P2O5·(100–(10+x))SiO2, with x having values of 20 and 35, were synthesized by a facile sol–gel technique within a mesoporous silica (SBA-15) template. Nanocrystals of cristobalite with a diameter of around 4 nm were grown within the amorphous phase by subjecting the composite to a suitable heat treatment. Details of the internal microstructural features were revealed through X-ray diffraction and transmission electron microscopy studies. High-resolution X-ray photoelectron spectroscopy studies affirmed the existence of Si4+/Si2+ and P5+/P3+ species in both glass compositions. In addition, the presence of both bridging and non-bridging oxygen ions caused the generation of defects at the interfacial regime, which resulted in the lowering of activation energy for sodium-ion transport within the nanocomposites. DC conductivity of all the nanocomposite samples was evaluated using complex impedance spectroscopy data. The AC conductivity behaviors of both systems have been analyzed considering both power law and stretched exponential relaxation functions. The influence of calcination temperature on the microstructural framework and its effect on sodium ion conductivity were investigated. The nanoglass–ceramic system exhibited higher room-temperature ionic conductivity (∼10–4.5 S·cm–1) and delivered a maximum capacity of 628.6 F/g at a scan rate of 100 mV/s. This was ascribed to the interfaces provided by the nanoglass and SBA-15 as well as the nanoglass and nanocrystals, which furnish a faster avenue for ion movement. The activation energy was found to be ∼0.053 eV. The nanoglass–ceramic system is capable of withstanding over 200 successive cycles with a >80% retention of its initial capacitance. Such intriguing features of the nanoglass–ceramic system make it a potential candidate for electrode materials in sodium-ion solid-state batteries.

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Carbon Yarn‐Ball‐Entangled SiO₂ Anode with Excellent Electrochemical Performance for Lithium‐Ion Batteries

Wang

Miao

et al. 2021

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Various nanoscale SiO2 and their composites have demonstrated superior electrochemical performance as anodes for lithium‐ion batteries. However, both the battery production and real applications require the integration of nanoscale SiO2 into micrometer‐sized secondary particles while preserving their excellent stability and conductivity, which remains a great challenge. In this work, a unique carbon yarn‐ball structure is successfully synthesized that entangles nanoscale SiO2 together to build a micrometer‐sized secondary particle. The hook‐like carbon wires closely adhere to individual SiO2 nanoparticles, which constitute the basic unit of the yarn‐ball structure. The entangled carbon wires create a network of electron conduction highways for SiO2, and the yarn‐ball structure provides a resilient 3D matrix that can effectively buffer the anisotropic volume changes of SiO2 during Li ion insertion/extraction. Under 0.1 A g−1, the carbon yarn‐ball‐entangled SiO2 can deliver a 1297 mAh g−1 discharge capacity with a small irreversible capacity of 82 mAh g−1. The entangled carbon yarn ball firmly maintains its structural integrity during high‐rate cycling (1 A g−1), which gives rise to a large accessible capacity (709 mAh g−1, 90.7% retention for 500 cycles), superior coulombic efficiency (>99.9%), and excellent structural stability.

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Composites of nanodimensional glass in the system Na2O–SiO2/Mesoporous silica and their high ionic conductivity

Cited by 11 publications

References 41 publications

Crossover of positive and negative magnetoconductance in composites of nanosilica glass containing dual transition metal oxides

Crossover of positive and negative magnetoconductance in composites of nanosilica glass containing dual transition metal oxides

Effect of Microstructure on Ionic Transport in Silica-Based Sodium Containing Nanoconfined Systems and Their Electrochemical Performance as Electrodes

Carbon Yarn‐Ball‐Entangled SiO₂ Anode with Excellent Electrochemical Performance for Lithium‐Ion Batteries

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Composites of nanodimensional glass in the system Na2O–SiO2/Mesoporous silica and their high ionic conductivity

Cited by 11 publications

References 41 publications

Crossover of positive and negative magnetoconductance in composites of nanosilica glass containing dual transition metal oxides

Crossover of positive and negative magnetoconductance in composites of nanosilica glass containing dual transition metal oxides

Effect of Microstructure on Ionic Transport in Silica-Based Sodium Containing Nanoconfined Systems and Their Electrochemical Performance as Electrodes

Carbon Yarn‐Ball‐Entangled SiO2 Anode with Excellent Electrochemical Performance for Lithium‐Ion Batteries

Contact Info

Product

Resources

About

Carbon Yarn‐Ball‐Entangled SiO₂ Anode with Excellent Electrochemical Performance for Lithium‐Ion Batteries