Eslam Sheha

Benha University · Department of Physics

Unlocking superior Mg-ion cells with good cycling performance as a future battery candidate is now crucial. However, structural instability is mainly reported in current oxide frameworks. Additionally, poor diffusion kinetics are typical due to the affinity of Mg²⁺ ions to interact with oxide anions. Herein, NMoP-0 glass was obtained according to t...

Potassium–sulfur batteries (KSBs) have garnered immense attention as a high-energy, cost-effective energy storage system. Nevertheless, achieving optimal sulfur utilization and long-term cycling is the primary challenge. To address some of the different challenges of KSBs, a potassium–sulfur (K/S) battery cathode was fabricated using MoS2, SiC, and...

Unlocking superior Mg-ion cells with good cycling performance as a future battery candidate is now crucial. However, structural instability is mainly reported in current oxide frameworks. Additionally, poor diffusion kinetics are typical due to the affinity of Mg ²⁺ ions to interact with oxide anions. Herein, NMoP-0 glass was obtained according to...

Magnesium batteries are promising post-lithium storms for their low cost and high energy density. Engineering novel cathodic materials compensate for the charge imbalance due to the introduction of the bivalent magnesium cation in the framework of the cathode, which is one of the key solutions for realizing a practical Mg battery. Herein, crystal e...

Magnesium sulfur (MgS) batteries are considered one of the most promising next-generation technologies for energy storage, expecting high energy density and low cost. The challenges of practical applications of reliable MgS batteries are finding non-nuclefilic electrolytes compatible with the electrophilic nature of sulfur cathodes and magnesium an...

Lanthanum doped nanocrystalline V2O5 films were fabricated. The chemical composition of xLa2O3–(1−x)V2O5.nH2O (where x = 0.25, 0.50 and 1.0 mol%) prepared by sol–gel method were studied. The structural properties were investigated by XRD and HRTEM and revealed a structure of highly oriented c-axis nanocrystals with (002) peak getting sharper by the...

Practical Mg batteries still face significant challenges in their development, like the lack of simple compatible electrolytes, self-discharge, the rapid passivation of the Mg anode, and the slow conversion reaction pathway. Here, we propose a simple halogen-free electrolyte (HFE) based on magnesium nitrate (Mg(NO3)2), magnesium triflate Mg(CF3SO3)...

Rechargeable magnesium batteries have attractive features as a post-lithium battery owing to their high volumetric capacity, safety, and low cost. However, the high charge density of Mg ²⁺ causes sluggish interfacial charge transfer kinetics at the electrode/electrolyte interface. This paper is an attempt to optimize the electrochemical performance...

Studying the interplay between the electrochemical performance and the electrolyte conditioning process is crucial for building an efficient magnesium battery. In this work, we use halogen-free electrolyte (HFE) based on Mg(NO3)2 in acetonitrile (ACN) and tetraethylene glycol dimethyl ether (G4) to study the effect of the aging time calendar on its...

The dielectric properties of the 13.5 Na2S – 32.5 V2O5–54 P2O5 glass was thoughtfully examined after the glass was traditionally quenched and thermally treated for different treatment durations of 4, 6 and 12 h. Ac impedance spectroscopy, dielectric constant, loss tangent and electric modulus were all studied for various frequencies ranging from 50...

Realizing practical Mg batteries still confronts crucial obstacles like the absence of a novel cathode with sufficient fast kinetic and the rapid passivation of the Mg anode. The paper aims to probe the effect of NaF electrolyte additive to halogen-free electrolyte HFE (0.69 M Mg(NO3)2·6H2O in ACN:G4(∼2:1) on changing the interfacial structure at t...

Abstract The realization of a practical magnesium battery is combined with the development of a high kinetic cathode and compatible electrolyte to facilitate the redox process. For this reason, silver phosphate glasses in the binary system (Fe2O3-AgPO3) are prepared using the conventional quenching method. The glasses were defined in the form [Fe2O...

The attempts to tailor the physical properties of barium titanate (BTO) to qualify it as a promising cathode for metal-ion batteries are interesting strategies. Herein, the paper attempts to modify the structure of BTO via electrochemical insertion of Mg ion within the framework of BTO. Introduction of Mg²⁺ ions within the framework of BTO drives t...

Low cost and safety qualify magnesium (Mg) metal batteries as one of the utmost post-lithium batteries. Nonetheless, most Mg electrolytes suffer from conditionality and incompatibility with most useable cathodes, hindering realising applicable Mg batteries. Herein, we study the effect of the stoichiometric ratio of Mg(CF3SO3)2/AlCl3 on the physical...

Herein, magnesium-ion conducting polymer electrolytes (PE) based on polyvinylidene fluoride (PVDF), tetraethylene glycol dimethyl ether (TEGDME), succinonitrile (SN), and different concentrations of magnesium triflate salt ((CF 3 SO 3 ) 2 Mg) were fabricated. The structural, optical, electrical, and electrochemical properties were investigated. The...

Developing suitable cathode material for alkali ion batteries is the most significant challenge facing commercialization. The effect of graphene nanoplatelets (GNP) on the physical and optical properties of AgPO3 glass is demonstrated. For the first time, AgPO3/Graphene glasses have been synthesized by melt-quenching method to assess the physical a...

Rechargeable magnesium batteries with their low cost, high safety, and environment-friendly are considered a promising post-lithium battery. Develop suitable cathode material and an electrolyte are the greatest challenges facing their commercialization. Herein, a halogen-free electrolyte-based Mg(NO3)2 in co-solvent of acetonitrile and tetraethylen...

High charge density of Mg yields the sluggish kinetic of Mg²⁺ insertion/extraction in the host lattice, this is a main difficulty to realize the commercial applications. As an attempt to overcome this challenge, a glass sample (NSVP) was prepared following the molar ratio (13.5 Na2S – 32.5 V2O5–54 P2O5) mol% using the melt-quenching process in addi...

Realizing practical magnesium-ion batteries (MIBs) is hindered by parasitic formation processes on the surface of the magnesium anode from contaminants typically from the electrolyte. Aiming to address this issue, we investigate the addition of water scavengers like hexamethyldisilazane (HMDS) and 2,2-dimethoxypropane (DMP) into a non-aqueous elect...

This paper is an attempt to design new cathodic materials for rechargeable magnesium batteries (RMBs) via combining sulfur (S) with BaTiO3 (BTO) by a sono-chemical method. X-ray diffraction (XRD) demonstrates that the introduction of sulfur within the framework of a tetragonal BTO results a small shift of the (1 0 1) plane of BTO from 31.44° to 31....

Magnesium (Mg) metal batteries are an exciting prospect as a post lithium battery owing to the high energy density and low cost. However, the formation of a poorly ion-conductive passivation layer on Mg electrode remains a major limiting factor impeding their practical applications. Herein, we adopt a potential approach by investigating the effect...

The development of a magnesium ion conducting electrolyte is essential for designing rechargeable magnesium batteries. Herein, we report magnesium-ion conducting polymer electrolytes (PE) based on polyvinylidene fluoride (PVDF) and tetraethylene glycol dimethyl ether (TEGDME) with magnesium bromide salt processed by solution casting method. Fourier...

Magnesium batteries are regarded as promising candidates for energy storage devices owing to their high volumetric capacity. The practical application is hindered, however, by strong electrostatic interactions between Mg ²⁺ and the host lattice and due to the formation of a passivation layer between anode and electrolyte. V 2 O 5 is a typical inter...

The sluggish Mg²⁺ kinetics in host materials is a big challenge that hinders realizing practical magnesium batteries. To overcome this problem, designing and testing a new system as a fast Mg²⁺ insertion cathode is a promising solution. Herein, hexagonal barium ferrite BaFe12O19 as cathode for magnesium ion batteries is presented for the first time...

Functional compatible electrolyte with Mg2+ intercalation cathodes represents one of the largest obstacles in the development of practical Mg batteries MBs. In current work, we report for the first time magnesium hexakis(methanol)-dinitrate complex (MHMD) electrolyte product reaction of 2,2-dimethoxypropane with magnesium nitrate hexahydrate via ‘S...

Nano-composites based on polyvinyl alcohol (PVA) and Graphene nanoplatelets (GNP) as (PVA) 1–x (GNP) x where x = 0, 5, 10, 20, 30 and 40 wt.% have been fabricated using solution cast technique. The influence of graphene additives on the morphology, structure, thermal and electrical properties of PVA has been examined by SEM, XRD, FTIR, TGA, DC/AC c...

Ultrafine Co3O4 nanoparticles homogeneously attached to graphene sheets by sonochemical method have been demonstrated as a promising cathode material for magnesium batteries. X-ray diffraction (XRD), scanning electron microscopy (SEM), and energy dispersive spectroscopy (EDS) have been employed to characterize the structural properties of this mate...

The anhydrous polymer electrolytes of poly(vinyl alcohol) PVA doped with various ratios of selenious acid and sodium bromide have been prepared by a solution casting method at room temperature. X-ray diffraction (XRD), ionic conductivity, dielectric properties of PVA(1–x) (NaBr) x/ 2(H2SeO3) x/ 2 films where x = 0.05, 0.10, 0.15 and 0.20 wt% have b...

The aim of the present work is to introduce a high performance cathode for magnesium-ion batteries. A simple ball mill process is employed to synthesize (V2O5)1-x (Graphene Nanoplatelets (GNP))x nanocomposite, (where x = 0, 5, 10, 15, 20 and 25 wt.% GNP). The synthesized samples are characterized using scanning electron microscope (SEM), X-ray diff...

TiO2/graphene nano platelets (GNP) nanocomposite cathodes have been synthesized through a simple ball mill process. TiO2 anatase nanoparticles, around 16 nm in size, were encapsulated in the 2D graphene matrix. The synthesized samples are characterized using x-ray diffraction (XRD), DSC, impedance spectroscopy, and scanning electron microscope (SEM...

In view of relatively low price, higher expected safety and the relatively low reactivity of magnesium, actively studies on rechargeable magnesium batteries are expected to have a wide scope. Polymer electrolyte of polyvinyl alcohol (PVA)—tetraethylene glycol dimethyl ether (TEGDME) with various magnesium bromide (MgBr2) contents (12.5, 25, 37 and...

The aim of this contribution is to introduce high performance materials for thermoelectric devices. Ananopolymer composite of PVAGNP ((polyvinyl alcohol ((PVA)0.6/graphene nanoplatelets (GNP)0.4))1-x(V2O5)x where x = 0, 2.5, 5, 7.5 and 10 wt% has been prepared using a solution cast technique. The influence of V2O5 additives on the morphology, struc...

Batteries convert chemical energy to electrical energy. Of the various types, magnesium battery combine the benefits of inexpensive, environmentally and safe to handle. However, the development of Magnesium battery has been hindered by obstacle. A key obstacle is poor activity of traditional cathode materials for intercalating Mg ions. Here, we pro...

In the present work, solid polymer electrolyte using poly(vinyl alcohol) (PVA) and magnesium perchlorate (Mg[(ClO 4 ] 2) in different compositions has been prepared by the solution-casting technique method. Surface feature of films was characterized by scanning electron microscopy (SEM) measurement. X-ray diffraction (XRD) was used to determine the...

Polymer electrolyte films of polyvinyl alcohol as host polymer, poly(3,4-etylenedioxythiophene)/ poly(styrenesulphonate), magnesium bromide were prepared using solution cast technique. Succinonitrile was used as plasticiser in the matrix at different concentrations. These films were characterised using thermogravimetric analysis, X-ray diffraction...

The aim of the contribution is to introduce a high performance magnesium conducting polymer electrolytes (PEs) comprising hybrid of poly(vinyl alcohol) (PVA), magnesium bromide (MgBr2) and tetraethylene glycol dimethyl ether (TEGDME) as plasticizer are prepared at various compositions by solution cast technique. X-ray diffraction and thermogravimet...

Non aqueous liquid electrolyte system based dimethyl sulfoxide DMSO and magnesium bromide (MgBr2) is synthesized via ‘Solvent-in-Salt’ method for the application in magnesium battery. Optimized composition of MgBr2/DMSO electrolyte exhibits high ionic conductivity of 10-2 S/cm at ambient temperature. This study discusses different concentrations fr...

A solid acid membranes based on poly(vinyl alcohol) (PVA), magnesium bromide (MgBr2) and phosphoric acid (H3 PO4) were prepared by a solution casting method. The morphological, X-ray and electrical properties of the (PVA)(1–x) (MgBr2)x/2 (H3 PO4)x/2 solid acid membranes where x = 0.0, 0.1, 0.2, 0.3 and 0.4 wt% were investigated. The PVA polymer ele...

In the present work, polymer electrolyte (PE) film consisting of poly(vinyl alcohol) (PVA) with magnesium bromide (MgBr2) as electrolytic salt, tetraethylene glycol dimethyl ether (TEGDME) as plasticizer and Li2O at different concentration (0.02, 0.04, 0.06 wt.%) as the filler has been prepared by solution casting technique. The polymeric film was...

A solid polymer electrolyte system based on poly(vinyl alcohol) (PVA) and poly(3,4-Etylenedioxythiophene):poly(styrenesulfonate) ( PSS) complexed with magnesium bromide (MgBr2) salt was prepared using solution cast technique. The ionic conductivity is observed to increase with increasing MgBr2 concentration. The maximum conductivity was found to be...

The aim of this work is to introduce a high performance cathode for magnesium-ion batteries. TiO2/reduced graphene oxide (rGO) composites were mixed in ball mill. The samples are characterized using XRD and SEM. The spex-milled composites exhibit better electrochemical performance with higher reversible capacity and excellent cyclability. The excel...

PVA/CuI polymer composite samples have been prepared and subjected to characterizations using FT-IR spectroscopy, DSC analysis, ac spectroscopy and dc conduction. The FT-IR spectral analysis shows remarkable variation of the absorption peak positions whereas DSC illustrates a little decrease of both glass transition temperature, Tg, and crystalliza...

The magnesium conducting solid-state polymer electrolyte PE comprising hybrid of poly(vinyl alcohol) (PVA) and magnesium bromide MgBr2, phosphomolbidic acid (PMA) H3PMo12O40, and tetraethylene glycol dimethyl ether (TEGDME) as plasticizer and TiO2 anatase as a nano-filler is prepared at various compositions by solution cast technique. The interacti...

Polymer blends of poly (vinyl alcohol) (PVA) and PEDOT:PSS (poly(3,4-ethylenedioxythiophene) poly(styrenesulfonate)), were prepared by casting from aqueous solution. They were characterized by x-ray diffraction, scanning electron microscopy, differential scanning calorimetery, thermo gravimetric analysis, Fourier transform infrared, ac spectroscopy...

Nanopolymer composite of PVA/CuI has been prepared as in both colloidal forms and solid layers and characterized their structure by X-ray diffraction, scanning electron microscopy, AC spectroscopy and optical absorption in UV–visible. It is observed that with the growth of CuI nanoparticles (in the range of 26–46 nm in size) reduces the PVA polymer...

A solid acid membranes based on poly (vinyl alcohol) (PVA), sodium bromide (NaBr) and phosphoric acid (H3PO4) were prepared by a solution casting method. The morphological, IR, electrical and optical properties of the (PVA)0.7(NaBr)0.3(H3PO4)xM solid acid membranes where x = 0.00, 0.85, 1.7, 3.4, 5.1 M were investigated. The variation of film morph...

In this work, a new polymer composite electrolyte films PCE are prepared based on poly(vinyl alcohol) (PVA), magnesium bromide MgBr2, phosphomolbidic acid (PMA), and tetraethylene glycol dimethyl ether (TEGDME) using solution cast technique. The XRD are used to determine the complexation of the PVA polymer with Mg acid salt. The ionic conductivity...

A novel PVA/CuI nanocomposite polymer electrolyte layer synthesized via the reduction of CuCl2 by NaI in an aqueous PVA solution. The as-prepared films were characterized by X-ray diffraction, scanning electron microscope, as well as impedance spectroscopy. The obtained results indicated the formation of hexagonal CuI nano particles of ≈55nm sizes...

Single crystals of KHCO3 were grown by the slow evaporation technique of an aqueous solution. Characterization of the sample was done using different techniques such as X-ray diffraction, infrared spectra (IR) and the differential scanning calorimeter (DSC) technique. The analysis of the X-ray diffraction pattern indicated that the sample was a sin...

KHCO3 compounds have been grown by the slow evaporation technique of an aqueous solution. The absorption process at the absorption edge of the compounds in the temperature range around the phase transition temperature (TF≈322K) was investigated. The sample exhibited exponential behavior of the absorption edge following Urbach's rule. The Urbach par...

In this paper, we report the synthesis and properties of a series of composite polymer electrolytes formed by dispersion of a non-ionic organic plastic material succinonitrile (SN) into poly (vinyl alcohol) complexed with magnesium acid salt. The addition of SN greatly enhances ionic conductivities of the electrolytes which is due to the high polar...

A novel multi-component system containing poly(vinyl alcohol), lithium bromide, sulfuric acid, ethylene carbonate and hydroquinone was prepared using a solution-casting technique. The presence of hydroquinone as a reducing agent in the inorganic–organic membrane structure thus produced was thought to lead to enhanced thermal stability of the membra...

A new proton-conductive membrane (PCM) based on poly (vinyl alcohol) and ammonium sulfate (NH4)2SO4 complexed with sulfuric acid and plasticized with ethylene carbonate (EC) at different weight percent were prepared by casting technique. The structural properties of these electrolyte films were examined by XRD studies. The XRD patterns of all the p...

The free-volumes of solid polymer electrolytes (SPE) were characterized using positron annihilation lifetime (PAL) spectroscopy, FTIR, and scanning electron microscope (SEM) techniques. The SPE based on poly(vinyl alcohol) (PVA) and sodium bromide (NaBr) complexed with sulfuric acid (SA) H2SO4 at different weight percent ratios were prepared using...

In this work, solid acid membrane consisting of poly(vinyl alcohol) (PVA), ammonium bromide (NH4Br) and sulfuric acid (SA) has been prepared by a solution casting technique method. X-ray diffraction of the (PVA)0.75(NH4Br)0.25(H2SO4)xM polymer matrix and pure (PVA)0.75(NH4Br)0.25 revealed the difference in crystallinity between them. The effect of...

Solid polymer electrolytes (SPE) based on poly-(vinyl alcohol) (PVA)0.7 and sodium iodide (NaI)0.3 complexed with sulfuric acid (SA) at different concentrations were prepared using solution casting technique. The structural properties of these electrolyte films were examined by X-ray diffraction (XRD) studies. The XRD data revealed that sulfuric ac...

Solid polymer electrolytes based on poly(vinyl alcohol) (PVA) complexed with ammonium sulfate (NH4)2SO4 at different weight percent ratios were prepared using solution cast technique. The structural properties of these electrolyte films were examined by X-ray diffraction (XRD) studies. The XRD data revealed that the amorphous domains of PVA polymer...

This paper describes the synthesis and characterization of a new solid acid polymer electrolyte (SAPE) based on polyvinyl alcohol, lithium bromide and sulfuric acid. Ethylene carbonate was used as plasticizer in the matrix for membranes prepared by a solution cast technique. AC impedance spectroscopy was used to determine the ionic conductivity of...

The total conductivity of the KHCO3 compound is studied in the frequency range 50 Hz–1 MHz and in the temperature range 300–370 K. The frequency dependence of the electrical conductivity is divided into three regions; the first one in the low-frequency range (dc conductivity), and the others in the moderate and relatively higher frequency ranges. I...

Solid polymer electrolytes (SPE) based on poly (vinyl alcohol) (PVA) and sodium bromide (NaBr) complexed with sulfuric acid (SA) at different weight percent ratios were prepared using solution cast technique. The structural properties of these electrolyte films were examined by XRD studies. The XRD data revealed that sulfuric acid disrupt the semi-...

The total conductivity of KHCO3 compound is studied in the frequency range 50 Hz-1 MHz and in the temperature range 300-370 K. The conductivity frequency dependence relation is divided into three regions: one at low frequency (dc conductivity), while the others appear at a moderate and relatively higher frequency range. In general, the conductivity...

The electrical conduction and dielectric properties of cesium sulfate, based materials of Cs2CO3:H2SO4:H3PO4 system with mole ratio 2:1:1, respectively, have been investigated in the temperature range 273–473 K and frequency range 50 Hz to 1 MHz. The data predict a phase transition for cesium sulfate at 300K. Both dielectric permittivity ɛ′ and die...

KHCO3 compound was characterized in three principle realms: for its dielectric properties as a function of temperature and frequency in the ranges 300--370 K and 50 Hz to 1 MHz, respectively; bulk conductivity as a function of temperature, via impedance technique; and relaxation time as function of temperature. Variations of the bulk conductivity a...