Browsing by Author "Sharma, A.L."

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Advanced cyclic stability and highly efficient different shaped carbonaceous nanostructured electrodes for solid-state energy storage devices
(Elsevier Ltd, 2022-07-12T00:00:00) Singh, Nirbhay; Tanwar, Shweta; Sharma, A.L.; Yadav, B.C.
The most reliant storage technologies are batteries and supercapacitors. While supercapacitors are more efficient in terms of faster energy delivery, sustainability, and high capacity retention. In supercapacitors, mostly utilized precursors are least abundant which are toxic and costly, as well as facing structural stability issues during the advanced charging-discharging cycles. So in the present work, we have studied the sustainability and capacity retention profile of shape-dependent carbonaceous materials in terms of cyclic stability. Here, we have prepared an environment-friendly, cost-effective carbon@FeOOH composite series by low-temperature hydrothermal method. The galvanostatic charge-discharge analysis shows a high power density of 5000 W kg?1 at a current density of 10 A g?1. The advanced capacity retention up to 92% is seen up to 15,000 cycles and 100% Coulombic efficiency till the last segment (30000th segment of charging-discharging) of galvanostatic charge-discharge (GCD) for optimized mesoporous carbon@FeOOH (MCF) sample. The symmetric solid-state device comprising MCF electrodes has been fabricated at the laboratory scale. It has been able to glow red LED for 18 min and a panel consisting of 16 LEDs for 5 min. A self-explanatory mechanism has also been proposed for a better understanding of readers. � 2022 Hydrogen Energy Publications LLC
Advanced sustainable solid state energy storage devices based on FeOOH nanorod loaded carbon@PANI electrode: GCD cycling and TEM correlation
(Elsevier Ltd, 2023-03-09T00:00:00) Singh, Nirbhay; Tanwar, Shweta; Kumar, Pradip; Sharma, A.L.; Yadav, B.C.
A cost-effective, environment-friendly polyaniline-wrapped activated carbon-FeOOH ternary composite electrode is developed by two steps facile method for the efficient and sustainable energy storage device. The HR-TEM analysis before and after cyclic stability (20 k cycles of charging-discharging) shows electrode structural stability and potentiality as an energy storage device. The ternary composite utilizes polyaniline (PANI) maximum, which reflects an increase in voltage window, and electrochemical performance. The voltammetry (cyclic) and galvanostatic charge-discharge (GCD) examination display specific capacitance of 213 F g?1 at 10 mV s?1 and 234 F g?1 at 2 mA sec?1 for 20 wt%. The drastic variation through EIS (electrochemical impedance spectroscopy) in equivalent series resistance is seen by the nyquist plot before and after cycling. The specific capacitance is 234.5 F g?1 at 1 Ag?1 for 20 wt% PANI composite. The energy(Ed) and power density (Pd) of the device are 45 W h kg?1 and 5997 W kg?1 at 2 mA and 20 mA, respectively. The fabricated device shows very advanced capacity retention of up to 89% and coulombic efficiency of 100% till the last 20 k cycles with a stable potential window. The fabricated device can glow LED panels (consisting of 26 LEDs) for up to 5.30 min. The device retention profile and stable potential window show its advanced structural stability up to commercial-scale cycling, which signifies the additional role of PANI. The HR-TEM and electrochemical results after cyclic stability are in correlation. � 2023 Elsevier B.V.
Aging impact of Se powder on the electrochemical properties of Molybdenum selenide: Supercapacitor application
(Elsevier Ltd, 2022-02-10T00:00:00) Tanwar, Shweta; Singh, Nirbhay; Sharma, A.L.
In the present report, we have studied the impact of aging on selenium (Se) powder in hydrazine hydrate (act as reducing agent) during synthesis of pure molybdenum selenide (MoSe2) material. The MoSe2 as electrode material is prepared via single-step hydrothermal technique with aging Se powder in reducing agent for zero, one, and three days. The structural, microstructural, and chemical nature analysis of the samples was done via XRD, FESEM, and FTIR tools whereas the electrochemical study was performed via CV, GCD, and EIS techniques. The optimized material coded as M 39 (three days aged sample with pH 9) shows a high specific capacitance (Cs) of 368 F g?1 at the current density of value 0.5 A g?1 along with an energy density of 51 Wh kg?1 and power density of 250 W kg?1. Based on the electrode's electrochemical outcomes, it may be indicated that the electrochemical performance of MoSe2 material upsurges as the aging of Se increases from zero to three days. From the obtained results it is could be predicted that the M 39 material may stand appropriate for commercial supercapacitors. � 2022
Aging impact on morphological and electrochemical performance of MoSe2 composite for supercapacitor application
(Elsevier Ltd, 2023-02-27T00:00:00) Tanwar, Shweta; Sharma, A.L.
The report is associated with the investigation of the impact of selenium powder aging in hydrazine hydrate acting as a reducing agent on the electrochemical performance of the molybdenum diselenide/activated carbon (MoSe2@AC) composite-based electrodes, and its supercapacitor application. The MoSe2@AC composite is formulated via the simple hydrothermal method. The composite formation is validated via structural, chemical bond, and morphology investigation. Among all synthesized samples, six days aged sample coded M6AC appears to exhibit the best electrochemical performance. The specific capacitance estimated for M6AC material-based fabricated symmetric cell is around 394 F g?1 at the 1 A g?1 using KOH (6 M) electrolyte. The energy and power density delivered by the same cell at 1 A g?1 is about 55 W h kg?1 and 845 W kg?1 correspondingly. Furthermore, we have tested the real-world usability of the M6AC symmetric cell by illuminating different voltage cum colors light emitting diodes (LEDs). The 26 red LEDs in the parallel connection illuminate for approximately 32 min with the aid of our fabricated symmetric cell as the power source. For easy understanding of the readers, we also report the self-proposed charge storage mechanism linked with the glowing LEDs using our obtained experimental results. Thereby, the observed outcomes associated with the M6AC material indicate that it has immense potential for scaling its performance at the industrial cum commercial level to resolve the energy crisis problem of the society. � 2023
All-redox hybrid supercapacitors based on carbon modified stacked zinc cobaltite nanosheets
(Royal Society of Chemistry, 2023-09-12T00:00:00) Kour, Simran; Kour, Pawanpreet; Sharma, A.L.
The role of energy in the present century has increased with the fast advancement of the global economy. In this regard, hybrid supercapacitors (HSCs) as energy storage systems have become an extensive research focus worldwide. This study reports the synthesis of carbon-loaded ZnCo2O4 stacked nanosheets via an in situ hydrothermal process followed by annealing. The electrochemical response was tested in a 2-electrode system. The optimized composite exhibited a capacitance of ?527.6 F g?1 at 5 mV s?1. The symmetric SC (SSC) possessed an energy density (Ed) of ?17.3 W h kg?1 corresponding to a power density (Pd) of 2.25 kW kg?1. Two asymmetric all-redox HSCs have also been fabricated using an optimized composite material as the positive electrode. The previously synthesized MnCo2O4/AC (HSC1) and MnO2/AC (HSC2) were taken as negative electrodes. HSC1 exhibited an Ed of ?24.4 W h kg?1 corresponding to a Pd of ?0.8 kW kg?1. On the other hand, HSC2 exhibited the highest Ed of ?30.8 W h kg?1 at 2.4 kW kg?1. The real-time application of the composite is tested with the fabricated HSCs. HSC1 exhibited a capacitive retention of ?72.2% after 10 000 cycles. On the other hand, HSC2 exhibited a capacitive retention of ?73.4% after 10 000 cycles. The SSC, HSC1, and HSC2 illuminated a 39 red LED panel for ?3 min, 7 min, and 13 min, respectively. The results suggested the promising performance of all-redox HSCs. The overall results present a sustainable approach for creating hierarchical energy materials for the construction of future energy-storage systems. � 2023 The Royal Society of Chemistry.
Challenges and Perspectives of Li-Ion Batteries, Supercapacitors, and Hydroelectric Cells
(CRC Press, 2021-09-06T00:00:00) Arya, Anil; Gaur, Anurag; Sharma, A.L.
This chapter provides an overview of challenges faced by different devices and their remedies. Supercapacitors are energy storage devices and have gained the attention of the scientific community due to their high power density, long cycle life, and a broad range of applications. The existing carbon/metal oxide-based electrode symmetric cell has a lower energy density. Energy density is an important parameter that needs to be improved with the existing high power density. The only feasible strategy is the development of hybrid architecture. The cell performance is strongly influenced by the contact between different components of the cell. The contact between the current collector as well as the active material needs to be improved for minimizing the interfacial resistance and for improving the charge transferability of the electrode material. The energy production through hydroelectric cells, based on metal oxides and their composites, by the splitting of water has turned out to be a feasible alternative to other green energy sources. � 2022 Taylor & Francis Group, LLC.
A critical review on orthosilicate Li2MSiO4 (M = Fe, Mn) electrode materials for Li ion batteries
(Institute of Physics, 2023-05-10T00:00:00) Pateriya, Ravi Vikash; Tanwar, Shweta; Sharma, A.L.
The development of novel electrode materials with good electrochemical performances is necessary for the expanded and varied applications of lithium-ion batteries, and this development heavily relies on cathode materials. Due to excellent thermal stability, abundance, low cost, and environmental friendliness, orthosilicate cathode materials Li2MSiO4 (M = Fe, Mn) has received a lot of attention recently. The present review article gives a glimpse into the characteristics, advantages, and recent progress of orthosilicate cathode materials. This review starts with a brief history and working mechanism of batteries, the advantages of cathode materials followed by types of cathode materials, various synthesis methods, and different techniques used for their characterization. The most current initiatives to enhance orthosilicate Li2MSiO4 type electrochemical performances were introduced in this review. We provide a critical assessment of the efficient modification techniques for the orthosilicate Li2MSiO4 type cathode materials in particular. These potential cathode materials� synthesis, structure, morphologies, and particularly electrochemical performances have been thoroughly examined. This evaluation, we hope, will clarify the sustained advancement of high-efficiency and reasonably priced Li-ion batteries. � 2023 IOP Publishing Ltd.
Dielectric relaxation and AC conductivity of TiO2 nanofiller dispersed polymer nanocomposite
(American Institute of Physics, 2019) Arya, A; Sadiq, M; Sharma, A.L.
The Lithium-ion conducting polymer nanocomposite (PNC) has been synthesized by the standard solution cast technique in the skeleton of PEO-PVC blend with a different content of Titanium oxide (TiO2) as nanofiller. The lithium hexafluorophosphate (LiPF6) was used as the salt. The dielectric strength decreases with frequency and is attributed to the dominance of the electrode polarization effect. The highest dielectric strength and lowest relaxation time (1.88ns) were achieved for the 15 wt. % TiO2 (PPS15T) PNCs when compared to other concentrations. The PPS15T exhibits the highest dc conductivity 2.34×10-5 S cm-1 at RT. The dielectric strength (Δϵ) and relaxation time (τϵ′) were in good agreement with the dc conductivity (σdc). An interaction scheme has also been proposed to highlight the interactions between the polymer, salt and nanofiller in most visual manner. © 2019 Author(s).
Economic and environment friendly carbon decorated electrode for efficient energy storage devices
(Elsevier Ltd, 2023-04-26T00:00:00) Singh, Nirbhay; Tanwar, Shweta; Sharma, A.L.; Yadav, B.C.
The most dependent storage technologies are secondary batteries and supercapacitors. Supercapacitors are more competent regarding faster energy supply, sustainability, and high-capacity retaining. However, in supercapacitors, most research comprises the least abundant materials that raise the cost and toxicity, which are unfavorable to the environment. Therefore, we have prepared activated carbon-based earth-abundant iron oxyhydroxide material via a low-temperature hydrothermal technique. The key finding of this research is sustainable materials, with co-related studies of TEM and GCD cyclic stability (pre and post-cycling characterizations up to 10k). The X-ray photoelectron spectroscopy analysis reveals the elemental composition of the optimized sample. The electrochemical performance has been tested via galvanostatic charge-discharge analysis, electrochemical impedance spectroscopy, and cyclic voltammetry. The cyclic stability evaluation is done to see the lasting usability of the device for the 10,000th number of charging-discharging cycles, which is supported by electrochemical impedance spectroscopy results in form of a Nyquist plot. The galvanostatic charge-discharge analysis revealed the specific capacitance of 372 F g?1 at 2 mA. The specific energy and power density were obtained as 40 Wh kg?1 and 4200 W kg?1, respectively. The ACF1 shows Coulombic efficiency and capacity retention as 96 % and 80 %, respectively, up to 10k cycles. We have proposed a charge storage mechanism for the fabricated electrode. A supercapacitor has been made-up and tested for the glow of LED, and the device can glow LED for 20 min. The device was repeated after two months and reproduced the LED glow for the same duration. � 2023 Elsevier Ltd
Effect of variation of different nanofillers on structural, electrical, dielectric, and transport properties of blend polymer nanocomposites
(Institute for Ionics, 2018) Arya,Anil; Sadiq, Mohd; Sharma, A.L.
In the present work, the effect of various nanofillers with different particle sizes and dielectric constants (BaTiO3, CeO2, Er2O3, or TiO2) on blend solid polymer electrolyte comprising PEO and PVC complexed with bulky LiPF6 has been explored. The XRD analysis confirms the polymer nanocomposite formation. FTIR provides evidence of interaction among the functional groups of the polymer with the ions and the nanofiller in terms of shifting and change of the peak profile. The highest ionic conductivity is ~ 2.3 x10−55 S cm−1 with a wide electrochemical stability window of f ~ 3.5 V for 10 wt% Er2O3. The real and imaginary parts of dielectric permittivity follow the identical trend of the decreasing value of dielectric permittivity and dielectric loss with increase in the frequency. The particle size and the dielectric constant show an abnormal trend with different nanofillers. The AC conductivity follows the universal Jonscher power law, and an effective mechanism has been proposed to understand the nanofiller interaction with cation coordinated polymer.
Electrochemical performance investigation of different shaped transition metal diselenide materials based symmetric supercapacitor with theoretical investigation
(Elsevier B.V., 2023-10-11T00:00:00) Tanwar, Shweta; Singh, Nirbhay; Vijayan, Ariya K.; Sharma, A.L.
Transition metal diselenide-based electrodes for hybrid symmetric supercapacitors appear as trending materials. Thereby in this paper, we report the preparation of different-shaped transition metal diselenides using a single-step hydrothermal route. The impact of the different morphology of the prepared transition metal diselenide material has been studied on their electrochemical performance. The nanoflower-shaped MoSe2 material was observed to deliver the highest electrochemical result than nanoneedles and nanospheres shape of CoSe2 and NiSe2 material respectively. The highest specific capacitance delivered by the MoSe2 material-based symmetric supercapacitor was 154 F g?1 at 10 mV s?1. It also exhibits a maximum energy density of 17 Wh kg?1 with 1267 W kg?1 power density. Further, the MoSe2-based symmetric supercapacitor has been utilized to burn different colors of light-emitting diodes along with a panel of 26 LEDs of red color. To make the working of the symmetric supercapacitor (MoSe2-based) easier to understand for the readers we have proposed a mechanism of charge storage associated with it. Additionally, the experimental finding has been supported by investigating the structural and electronic properties of MoSe2, CoSe2, and NiSe2 via density functional theory calculation. � 2023
Electrolytes for Li-Ion Batteries and Supercapacitors
(CRC Press, 2021-09-06T00:00:00) Arya, Anil; Pandey, Lokesh; Gaur, Anurag; Kumar, Vijay; Sharma, A.L.
This chapter is dedicated to the electrolyte that is a crucial component of any device. Electrolyte plays a dual role in the device, acts as a carpet for electrolyte ions, and also separates the electrodes to avoid short-circuiting or explosion. Initially, the characteristics parameter and selection criteria for the electrolyte will be discussed. Then, the organic electrolytes have been discussed followed by a focus on emerging novel gel/solid polymer electrolytes for application in battery and supercapacitor. The performance of the battery and supercapacitor is shown for different electrolytes. � 2022 Taylor & Francis Group, LLC.
Energy Storage and Conversion Devices: Supercapacitors, Batteries, and Hydroelectric Cells
(CRC Press, 2021-09-06T00:00:00) Gaur, Anurag; Sharma, A.L.; Arya, Anil
This book presents a state-of-the-art overview of the research and development in designing electrode and electrolyte materials for Li-ion batteries and supercapacitors. Further, green energy production via the water splitting approach by the hydroelectric cell is also explored. Features include: � Provides details on the latest trends in design and optimization of electrode and electrolyte materials with key focus on enhancement of energy storage and conversion device performance � Focuses on existing nanostructured electrodes and polymer electrolytes for device fabrication, as well as new promising research routes toward the development of new materials for improving device performance � Features a dedicated chapter that explores electricity generation by dissociating water through hydroelectric cells, which are a nontoxic and green source of energy production � Describes challenges and offers a vision for next-generation devices This book is beneficial for advanced students and professionals working in energy storage across the disciplines of physics, materials science, chemistry, and chemical engineering. It is also a valuable reference for manufacturers of electrode/electrolyte materials for energy storage devices and hydroelectric cells. � 2022 Taylor & Francis Group, LLC.
Enhanced Curie temperature and superior temperature stability by site selected doping in BCZT based lead-free ceramics
(Elsevier Ltd, 2022-01-31T00:00:00) Kumari, Sapna; Kumar, Amit; Kumar, Aman; Kumar, V.; Thakur, Vikas N.; Kumar, Ashok; Goyal, P.K.; Gaur, Anurag; Arya, Anil; Sharma, A.L.
In this work, Bi3+ doped Ba0.98-3x/2BixCa0.02Zr0.02Ti0.976Cu0.008O3 [0 ? x ? 0.03] lead free ceramics, to be employed for structural, dielectric and ferroelectric studies, have been synthesized via conventional solid state reaction method. Rietveld refinement of the X-ray diffraction (XRD) data evidences the existence of a pure perovskite phase with tetragonal symmetry for all ceramics. The Scanning Electron Microscopy (SEM) reveals that the grain size, which is 16.14 ?m for x = 0 reduced to 2.11 ?m for x = 0.03. Dielectric studies demonstrate excellent dielectric behavior with high Curie temperature (TC ?159 �C), high dielectric constant (?r ?834, ?max ? 3146), and a low dielectric loss (tan? ? 0.019), for an optimum value of x = 0.02. The analysis of temperature coefficient of the dielectric permittivity indicates the applicability of these materials in multilayer ceramic capacitors. Impedance studies, conducted to understand the underlying physical mechanisms, are found to be in good agreement with the results of structural and dielectric studies. Furthermore, the ferroelectric measurement confirms the ferroelectric nature for all samples with an energy storage efficiency (?) of ?42% for x = 0.02 composition. � 2022 Elsevier Ltd and Techna Group S.r.l.
Fabrication of activated carbon coated MSe2 (M=Mo, Co, and Ni) nanocomposite electrode for high-performance aqueous asymmetric supercapacitor
(Elsevier B.V., 2023-03-09T00:00:00) Tanwar, Shweta; Singh, Nirbhay; Sharma, A.L.
Transition metal diselenides are trendy electrode materials for supercapacitors. The main reason behind it is their high specific capacitance. But, they suffer from poor electronic conductivity and agglomeration issues which hinder their practical use. Herein, we present the preparation of nanocomposites including transition metal diselenide MSe2 (M=Mo, Co, and Ni) with activated carbon using the facial hydrothermal route. Inspiring from the high electrochemical results of a hybrid nanocomposites symmetric cell, an aqueous asymmetric ultracapacitor cell (AUC) comprised of different shaped carbon-coated MSe2 (positive electrode) as well as activated carbon (AC) (negative electrode) has been fabricated. The NAC//6KOH//AC asymmetric cell displays the best outcomes among all fabricated devices. The specific capacitance observed is about 3740 F g?1 at 10 mV s?1. It delivers a high energy density of 69 Wh kg?1 along with a power density of 687 W kg?1 at 1 A g?1. The electrochemical results motivate us to explore the practical usability of the prepared NAC//6KOH//AC device via illuminating 26 red LED panels which glow for 26 min. The findings in this report indicate that MSe2-based nanocomposite has the scope and is a potential material in the energy storage field. � 2023 Elsevier B.V.
Fabrication of activated carbon electrodes derived from peanut shell for high-performance supercapacitors
(Springer Science and Business Media Deutschland GmbH, 2021-07-06T00:00:00) Pandey, Lokesh; Sarkar, Subhajit; Arya, Anil; Sharma, A.L.; Panwar, Amrish; Kotnala, R.K.; Gaur, Anurag
In this work, the activated carbon (AC) is derived from the waste material of peanut shells. The obtained activated carbon has been synthesized using the chemical activation process via impregnation with NaOH at various proportions (1:2 and 1:3). The structural, morphological, and electrochemical properties of obtained AC are examined by X-ray diffraction (XRD), BET surface analysis, scanning electron microscopy (SEM), and electrochemical techniques. The resulting AC shows the enhancement in specific surface area (SSA) from 584 to 735 m2/g at 1:2 ratio and 826 m2/g at 1:3 ratio after the activation process. The electrodes are fabricated using derived activated carbon for electrochemical characterization. It has been observed through cyclic voltammetry and galvanostatic charge�discharge measurements that 1:3 NaOH-activated samples reveal the maximum value of specific capacitance (263 F/g at 10�mV/s and 290 F/gat 0.2A/g). The sample also conveys the pre-dominant ~ 98% of efficiency from 400 to 1000th cycle with fast and almost constant capacitance. The electrochemical impedance spectroscopy (EIS) result suggests the pure capacitive nature of the sample and indicates the dominating electric double-layer capacitive (EDLC) behavior. The obtained results demonstrate that the peanut shell�derived activated carbon is a potential candidate as an electrode material for supercapacitors. Graphical abstract: [Figure not available: see fulltext.] � 2021, The Author(s), under exclusive licence to Springer-Verlag GmbH Germany, part of Springer Nature.
Fabrication of energy storage EDLC device based on self-synthesized TiO2 nanowire dispersed polymer nanocomposite films
(Springer Science and Business Media Deutschland GmbH, 2021-05-24T00:00:00) Devi, Chandni; Swaroop, Ram; Arya, Anil; Tanwar, Shweta; Sharma, A.L.; Kumar, Sandeep
In this work, a systematic study of titanium oxide (TiO2) nanowires incorporated polymer nanocomposite (PNC) films prepared by a standard solution cast technique is reported. The structural, morphological, dielectric, and electrochemical properties were investigated thoroughly. The polymer nanocomposite films demonstrated improved electrical and electrochemical properties as compared to polymer�salt complex film. The morphological and structural properties have been examined by the field emission scanning electron microscope, Fourier transform infrared spectroscopy, and X-ray diffraction. It is observed that the maximum ionic conductivity is of the order of 10�5 S cm?1 exhibited by 0.5 wt% nanowire added polymer nanocomposite film. The ion transference number was close to unity for optimized film and stability window of about ~ 5�V. The shift of loss tangent peak toward the high-frequency window with nanowire addition indicates a decrease of the relaxation time. The optimized TiO2 nanowire dispersed polymer nanocomposite film has been used to fabricate the electric double-layer capacitor cells. The fabricated cell demonstrates the specific capacitance of about 57.5 F/g (at 10�mV/s). The calculated energy density and power density are 1.38 Wh kg?1 and 0.709�kW�kg?1, respectively. The Coulombic efficiency is 97.7% up to the 500 cycles for the fabricated cell. The prepared polymer nanocomposite has the potential to use it as electrolyte cum separator for solid-state electric double-layer capacitor applications. � 2021, The Author(s), under exclusive licence to Springer-Verlag GmbH Germany, part of Springer Nature.
Fundamentals of Batteries and Supercapacitors: An Overview
(CRC Press, 2021-09-06T00:00:00) Arya, Anil; Gaur, Anurag; Sharma, A.L.; Kumar, Vijay
Energy plays an important role in daily human life and is the basic need in the present scenario. Nowadays, the development of energy sources is linked with the development of human civilization. The high energy density and high power density energy devices are on the radar of the research community. Batteries and supercapacitors (SCs) are two potential energy storage devices dominating the energy sector all over the world. This chapter starts with a focus on energy technologies and storage needs. Then, fundamentals of electrochemistry have been discussed followed by the working principle of battery and SC, and how energy is stored. Different types of batteries and SCs are discussed with their charge storage mechanisms. At last, important performance parameter and their influence on the overall device and its performance is presented. � 2022 Taylor & Francis Group, LLC.
A glimpse on all-solid-state Li-ion battery (ASSLIB) performance based on novel solid polymer electrolytes: a topical review
(Springer, 2020) Arya, A; Sharma, A.L.
All-solid-state batteries are swiftly gaining the attention of the research community owing to their widespread applications in electric vehicles, digital electronics, portable appliances, etc. A battery comprises three components: cathode, anode and electrolyte. An electrolyte is the heart of the battery and plays a crucial role in the overall performance of the battery. In order to make the review more focused, all-solid-state Li-ion batteries (ASSLIBs) have been considered. This review covers the architecture of ASSLIBs, advantages, and characteristics of the solid polymer electrolytes. The important preparation methods are summarized, followed by the characterizations for testing the suitability of electrolytes for solid-state batteries. The discussion is focused on the "state of the art" in the field of solid-state batteries, device fabrication, and comparison in terms of capacity, energy density, and cyclic stability. In the last section, the ion conduction mechanism in different solid polymer electrolytes is discussed. Finally, it is tried to give a possible outlook for developing future hybrid and multifunctional electrolytes which can act as a bridge for developing solid-state batteries covering a broad range of applications. - 2020, Springer Science+Business Media, LLC, part of Springer Nature.
Hierarchical template-free chestnut-like manganese cobaltite for high-performance symmetric and asymmetric supercapacitor
(Elsevier B.V., 2022-11-25T00:00:00) Kour, Simran; Tanwar, Shweta; Kour, Pawanpreet; Sharma, A.L.
In this work, template-free Chestnut-like MnCo2O4 microspheres are synthesized using a straight-forward hydrothermal process succeeded by calcination. Urea as a reducing/precipitating agent can play an essential role in controlling the morphology of the material without using any additional surfactants or templates. The effect of reducing agent (Urea) on the structural and morphological evolution of MnCo2O4 has been studied. The electrochemical performance of the synthesized materials is investigated in a real device two-electrode cell configuration (symmetric and asymmetric system) rather than a three-electrode configuration. The two-electrode system gives more accurate and practical evaluation of the capacitive behavior of the material. The MnCo2O4 displayed the highest capacitance of 245.34 F g?1 at 5 mV s?1 for 0�1 V in a symmetric cell configuration. It also held an energy density of 22.24 Wh kg?1 at 1500 W kg?1. The optimized sample showed outstanding cyclic performance with only 3% of capacitance loss after 5000 cycles. Based on the structural and electrochemical findings, a charge storage mechanism has been proposed for the symmetric SC. Furthermore, a hybrid asymmetric supercapacitor with MnCo2O4 as a cathode and the previously synthesized MnO2/AC as an anode is also fabricated which exhibited an energy response of 30.12 Wh kg?1 for a power of 7000 W kg?1. For practical applications, different colored LEDs (red, yellow, green, and blue) and a panel with six red LEDs have been illuminated. The panel with six red LEDs is illuminated for 12 mins. for symmetric supercapacitor and 18 mins. for asymmetric supercapacitor. All these remarkable outcomes suggested that the synthesized material has wide potential for supercapacitors. � 2022