Nanocrystalline Li2TiO3 electrodes for supercapattery application

Narayana, A. Lakshmi; Dhananjaya, Merum; Prakash, Nunna Guru; Hussain, O. M.; Julien, C.

doi:10.1007/s11581-017-2147-1

Cited by 23 publications

(12 citation statements)

References 52 publications

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“…Cyclic voltammograms display one set of well-defined current peaks (see Figure 7 in Ref. [53]) corresponding to the redox reaction in Li//Li 2 TiO 3 cell, according the (de)insertion reaction:…”

Section: + -Ion Diffusivitymentioning

confidence: 99%

“…In previous works, we have investigated the electrochemical properties of pristine nano-LTO [53], and the improve performance of LTO/CNT and LTO/graphene composites [54]. The effect of nanosized Li 2 TiO 3 was evidenced by the excellent cyclability and the stable specific discharge capacity of 113, 143 and 150 mAh g −1 , respectively, retained over 30 charge-discharge cycles at 1C rate.…”

Section: Introductionmentioning

confidence: 99%

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Transport Properties of Nanostructured Li2TiO3 Anode Material Synthesized by Hydrothermal Method

Lakshmi-Narayana

Hussain

Mauger

et al. 2019

Sci

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Li2TiO3 nanopowders were synthesized by hydrothermal process using anatase TiO2 and LiOHH2O as raw materials. Li2TiO3 crystallizes in the layered monoclinic structure (space group C2/c) with average crystallite size of 34 nm. Morphology, elemental composition and local structure of products were carried out using high-resolution transmission electron microscopy, field-emission scanning electron microscopy, Raman and Fourier transform infrared spectroscopy. Transport properties investigated by d.c. (4-probe measurements) and a.c. (complex impedance spectroscopy) show the activation energy of 0.71 and 0.65 eV, respectively. The ionic transport properties of Li+ ions in nanocrystalline Li2TiO3 characterized by cyclic voltammetry and impedance spectroscopy validate the good electrochemical properties of this anode material for lithium-ion batteries.

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Section: + -Ion Diffusivitymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Transport Properties of Nanostructured Li2TiO3 Anode Material Synthesized by Hydrothermal Method

Lakshmi-Narayana

Hussain

Mauger

et al. 2019

Sci

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“…As depicted in the figure, the CV signature of TNFs prepared at 500°C shows almost rectangular shape at different sweep rates from 1-200 mVs −1 . The almost rectangular and symmetrical image is appeared without conspicuous redox peaks at all scan rates indicating that the electrochemical process is involved both faradaic and double layer capacitance, an evidence of TNFs capacitive behavior [55]. The pseudocapacitive behavior arises from the reversible redox reactions involving the exchange of protons and/or Li-ions with the electrolyte [56].…”

Section: Electrochemical Propertiesmentioning

confidence: 95%

“…The similar behavior can also be observed for Li 2 TiO 3 , Ni(OH) 2 , and V 2 O 5 /polyaniline. [27,55,58]. The specific capacitance of the TNFs electrode prepared at 500°C are further evaluated by galvonostatic charge-discharge (GCD) measurements at different current densities ranging 1-100 mA g −1 in the potential window 0.0-0.8 V and shown in figure 5(b).…”

Section: Electrochemical Propertiesmentioning

confidence: 99%

“…In contrary, pseudocapacitors have performed substantially higher capacitance of 300-1200 Fg −1 through faradaic storage mechanism [15]. The transition metal oxides such as RuO 2 [16], MnO 2 [17], NiO x [18], Co 3 O 4 [19], CuO x [20], Fe 2 O 3 [21], MoO 3 [22], V 2 O 5 [23], Li 2 TiO 3 [24] and TiO 2 [25] etc, conductive polymers and polyaniline are commercially used pseudocapacitor compounds [26][27][28]. Among them TiO 2 is ubiquitous material for the supercapacitor applications.…”

Section: Introductionmentioning

confidence: 99%

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Electrospun TiO₂ nanofiber electrodes for high performance supercapacitors

Narayana

Hussain

Reddy

2020

Mater. Res. Express

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Nanofibers are one dimensional (1D) nanoarchitecture materials having high surface-to-volume ratio which provides improved ion diffusion and high mechanical strength to prevent volume expansion during electrochemical process and enhance the cycle stability. In the present study, TiO 2 nanofibers (TNFs) were successfully synthesized on an aluminum collector with a polymer concentration of 9 wt % by cost-effective electrospinning technique followed by annealing at a temperature 500°C. The XRD spectrum of electrospun TNFs exhibited predominant (101) orientation corresponding to anatase TiO 2 with I4 1 /amd symmetry. The estimated average crystallite size is 18 nm. The strongest Raman vibrational mode at 143 cm −1 confirms the phase purity of TNFs. The surface morphological feature depicts interconnected network fibers with a variation in the fiber diameter and the estimated average diameter is ∼150±20 nm. Very smooth surface and homogenously distributed ultra long nanofibers are observed from TEM analysis. The newly fabricated TNF electrode delivered a specific capacitance of 75 Fg −1 and retained 95% capacitance even after 5000 cycles. Moreover, it exhibited energy density and power density values of 24 Whkg −1 and 22.08 Wkg −1 respectively. The large capacitance, high coulombic efficiency and good structural stability demonstrate that TNFs should open up new opportunities for the next-generation high performance supercapacitors.

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High‐Performance NiCo₂O₄/Graphene Quantum Dots for Asymmetric and Symmetric Supercapacitors with Enhanced Energy Efficiency

Lakshmi‐Narayana,

Attarzadeh,

Shutthanandan

et al. 2024

Adv Funct Materials

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For the sustainable growth of future generations, energy storage technologies like supercapacitors and batteries are becoming more and more common. However, reliable and high‐performance materials’ design and development is the key for the widespread adoption of batteries and supercapacitors. Quantum dots with fascinating and unusual properties are expected to revolutionize future technologies. However, while the recent discovery of quantum dots honored with a Nobel prize in Chemistry, their benefits for the tenacious problem of energy are not realized yet. In this context, herein, chemical‐composition tuning enabled exceptional performance of NiCo2O4(NCO)/graphene quantum dots (GQDs) is reported, which outperform the existing similar materials, in supercapacitors. A comprehensive study is performed on the synthesis, characterization, and electrochemical performance evaluation of highly functional NCO/GQDs in supercapacitors delivering enhanced energy efficiency. The high‐performance, functional NCO/GQDs electrode materials are synthesized by the incorporation of GQDs into NCO. The effect of variable amount of GQDs on the energy performance characteristics of NCO/GQDs in supercapacitors is studied systematically. In‐depth structural and chemical bonding analyses using X‐ray diffraction (XRD) and Raman spectroscopic studies indicate that all the NCO/GQDs composites crystallize in the spinel cubic phase of NiCo2O4 while graphene integration evident in all the NCO/GQDs. The scanning electron microscopy imaging analysis reveals homogeneously distributed spherical particles with a size distribution of 5–9 nm validating the formation of QDs. The high‐resolution transmission electron microscopy analyses reveal that the NCOQDs are anchored on graphene sheets, which provide a high surface area of 42.27 m2g−1 and high mesoporosity for the composition of NCO/GQDs‐10%. In addition to establishing reliable electrical connection to graphene sheets, the NCOQDs provide reliable 3D‐conductive channels for rapid transport throughout the electrode as well as synergistic effects. Chemical‐composition tuning, and optimization yields NCO/GQDs‐10% to deliver the best specific capacitance of 3940 Fg−1 at 0.5 Ag−1, where the electrodes retain ≈98% capacitance after 5000 cycles. The NCO/GQD‐10%//AC asymmetric supercapacitor device demonstrates outstanding energy density and power density values of 118.04 Wh kg−1 and 798.76 W kg−1, respectively. The NCO/GQDs‐10%//NCO/GQDs‐10% symmetric supercapacitor device delivers excellent energy and power density of 24.30 Wh kg−1 and 500 W kg−1, respectively. These results demonstrate and conclude that NCO/GQDs are exceptional and prospective candidates for developing next‐generation high‐performance and sustainable energy storage devices.

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Nanocrystalline Li2TiO3 electrodes for supercapattery application

Cited by 23 publications

References 52 publications

Transport Properties of Nanostructured Li2TiO3 Anode Material Synthesized by Hydrothermal Method

Transport Properties of Nanostructured Li2TiO3 Anode Material Synthesized by Hydrothermal Method

Electrospun TiO₂ nanofiber electrodes for high performance supercapacitors

High‐Performance NiCo₂O₄/Graphene Quantum Dots for Asymmetric and Symmetric Supercapacitors with Enhanced Energy Efficiency

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Nanocrystalline Li2TiO3 electrodes for supercapattery application

Cited by 23 publications

References 52 publications

Transport Properties of Nanostructured Li2TiO3 Anode Material Synthesized by Hydrothermal Method

Transport Properties of Nanostructured Li2TiO3 Anode Material Synthesized by Hydrothermal Method

Electrospun TiO2 nanofiber electrodes for high performance supercapacitors

High‐Performance NiCo2O4/Graphene Quantum Dots for Asymmetric and Symmetric Supercapacitors with Enhanced Energy Efficiency

Contact Info

Product

Resources

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Electrospun TiO₂ nanofiber electrodes for high performance supercapacitors

High‐Performance NiCo₂O₄/Graphene Quantum Dots for Asymmetric and Symmetric Supercapacitors with Enhanced Energy Efficiency