scholarly journals Effect of Sm3+ Substitutions on the Lithium Ionic Conduction and Relaxation Dynamics of Li5+2xLa3Nb2−xSmxO12 Ceramics

Crystals ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 95
Author(s):  
Mohamad M. Ahmad ◽  
H. Mahfoz Kotb ◽  
Adil Alshoaibi ◽  
M. H. Hadj Alouane ◽  
Abdullah Aljaafari ◽  
...  
Keyword(s):  
Ionic Conductivity ◽  
Electric Modulus ◽  
Ionic Conduction ◽  
Lithium Ion ◽  
Relaxation Processes ◽  
Relaxation Dynamics ◽  
Garnet Phase ◽  
Different Temperatures ◽  
Main Factor ◽  
Conduction Properties

In the present work, we studied the effects of substitutional Sm3+ ions on the ionic conduction properties of Li5+2xLa3Nb2−xSmxO12 (LLN-Sm) ceramics with x = 0.0—0.6. The investigated final ceramics, prepared by solid state reaction, were sintered at 1000 °C for 12 h. XRD investigations showed the formation of the cubic garnet phase for all of the studied samples. The ionic conductivity was found to increase with Sm3+ content, with the highest value of 7.04 × 10−5 S/cm for the Li5+2xLa3Nb2−xSmxO12 sample compared to 7.49 × 10−6 S/cm for the pure LLN sample, both at RT. Lithium ion mobilities of LLN-Sm garnets at different temperatures were estimated. Considerable enhancement of mobility, the main factor leading to ionic conductivity improvement, was obtained for samples with Sm3+ substitutions. Relaxation processes were studied by the electric modulus, and the corresponding activation energy was found to be very similar to the ionic conduction process.

scholarly journals Dielectric and impedance analysis of Li0.5La0.5Ti1-xZrxO3(x = 0.05 and 0.1) ceramics as improved electrolyte material for lithium-ion batteries

2016 ◽  
Vol 34 (3) ◽  
pp. 605-616 ◽  
Author(s):  
K. Vijaya Babu ◽  
V. Veeraiah
Keyword(s):  
Ionic Conductivity ◽  
Lithium Ion Batteries ◽  
Electric Modulus ◽  
Lithium Ion ◽  
Impedance Analysis ◽  
Solid State Reaction Method ◽  
High Ionic Conductivity ◽  
Conductivity Relaxation ◽  
Reaction Method ◽  
X Ray

AbstractThe most attractive property of Li0.5La0.5TiO3 (LLTO) electrolytes is their high ionic conductivity. Studies have shown that LLTO is capable of existing in a state with an ionic conductivity of 10-3 S/cm, which is comparable to liquid electrolytes. In addition to the high ionic conductivity of the material, LLTO is electrochemically stable and able to withstand hundreds of cycles. So, the studies of the solid electrolyte material are very important for the development of lithium-ion batteries. In the present paper, Li0.5La0.5Ti1-xZrxO3 (x = 0.05 and 0.1) have been prepared by a solid-state reaction method at 1300 °C for 6 hours to improve electrolyte materials for lithium-ion batteries. The phase identified by X-ray diffractometry and crystal structure corresponds to pm3m (2 2 1) space group (Z = 1). The frequency and temperature dependence of impedance, dielectric permittivity, dielectric loss and electric modulus of the Li0.5La0.5Ti1-xZrxO3 (x = 0.05 and 0.1) have been investigated. The dielectric and impedance properties have been studied over a range of frequency (42 Hz to 5 MHz) and temperatures (30 °C to 100 °C). The frequency dependent plot of modulus shows that the conductivity relaxation is of non-Debye type.

scholarly journals Contribution Succinonitrile additive for Performa LiTFSi Solid Polymer Electrolytes for Li-Ion Battery

2020 ◽  
Vol 20 (2) ◽  
Author(s):  
Qolby Sabrina ◽  
Titik Lestariningsih ◽  
Christin Rina Ratri ◽  
Achmad Subhan
Keyword(s):  
Ionic Conductivity ◽  
Polymer Electrolytes ◽  
Room Temperature ◽  
Lithium Salt ◽  
Ionic Conduction ◽  
Lithium Ion ◽  
Solid Polymer Electrolytes ◽  
Solid Polymer ◽  
Half Cell ◽  
Li Ion

Solid polymer electrolyte (SPE) appropriate to solve packaging leakage and expansion volume in lithium-ion battery systems. Evaluation of electrochemical performance of SPE consisted of mixture lithium salt, solid plasticizer, and polymer precursor with different ratio. Impedance spectroscopy was used to investigate ionic conduction and dielectric response lithium bis(trifluoromethane)sulfony imide (LiTFSI) salt, and additive succinonitrile (SCN) plasticizer. The result showing enhanced high ionic conductivity. In half-cell configurations, wide electrochemical stability window of the SPE has been tested. Have stability window at room temperature, indicating great potential of SPE for application in lithium ion batteries. Additive SCN contribute to forming pores that make it easier for the li ion to move from the anode to the cathode and vice versa for better perform SPE. Pore of SPE has been charaterization with FE-SEM. Additive 5% w.t SCN shows the best ionic conductivity with 4.2 volt wide stability window and pretty much invisible pores.

scholarly journals Near ideal synaptic functionalities in Li ion synaptic transistor using Li3POxSex electrolyte with high ionic conductivity

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
Revannath Dnyandeo Nikam ◽  
Myonghoon Kwak ◽  
Jongwon Lee ◽  
Krishn Gopal Rajput ◽  
Writam Banerjee ◽  
...  
Keyword(s):  
Solid State ◽  
Ionic Conductivity ◽  
Ionic Conduction ◽  
Lithium Ion ◽  
High Ionic Conductivity ◽  
Ion Migration ◽  
Conductance Switching ◽  
Device Development ◽  
Artificial Synapse ◽  
Li Ion

AbstractAll solid-state lithium-ion transistors are considered as promising synaptic devices for building artificial neural networks for neuromorphic computing. However, the slow ionic conduction in existing electrolytes hinders the performance of lithium-ion-based synaptic transistors. In this study, we systematically explore the influence of ionic conductivity of electrolytes on the synaptic performance of ionic transistors. Isovalent chalcogenide substitution such as Se in Li3PO4 significantly reduces the activation energy for Li ion migration from 0.35 to 0.253 eV, leading to a fast ionic conduction. This high ionic conductivity allows linear conductance switching in the LiCoO2 channel with several discrete nonvolatile states and good retention for both potentiation and depression steps. Consequently, optimized devices demonstrate the smallest nonlinearity ratio of 0.12 and high on/off ratio of 19. However, Li3PO4 electrolyte (with lower ionic conductivity) shows asymmetric and nonlinear weight-update characteristics. Our findings show that the facilitation of Li ionic conduction in solid-state electrolyte suggests potential application in artificial synapse device development.

scholarly journals PEO based polymer-ceramic hybrid solid electrolytes: a review

2021 ◽  
Vol 8 (1) ◽  
Author(s):  
Jingnan Feng ◽  
Li Wang ◽  
Yijun Chen ◽  
Peiyu Wang ◽  
Hanrui Zhang ◽  
...  
Keyword(s):  
Ionic Conductivity ◽  
Ionic Conduction ◽  
Lithium Ion ◽  
High Energy ◽  
Solid Polymer Electrolytes ◽  
High Ionic Conductivity ◽  
Solid Polymer ◽  
Impact Factors ◽  
Preparation Methods ◽  
Long Cycle Life

AbstractCompared with traditional lead-acid batteries, nickel–cadmium batteries and nickel-hydrogen batteries, lithium-ion batteries (LIBs) are much more environmentally friendly and much higher energy density. Besides, LIBs own the characteristics of no memory effect, high charging and discharging rate, long cycle life and high energy conversion rate. Therefore, LIBs have been widely considered as the most promising power source for mobile devices. Commonly used LIBs contain carbonate based liquid electrolytes. Such electrolytes own high ionic conductivity and excellent wetting ability. However, the use of highly flammable and volatile organic solvents in them may lead to problems like leakage, thermo runaway and parasitic interface reactions, which limit their application. Solid polymer electrolytes (SPEs) can solve these problems, while they also bring new challenges such as poor interfacial contact with electrodes and low ionic conductivity at room temperature. Many approaches have been tried to solve these problems. This article is divided into three parts to introduce polyethylene oxide (PEO) based polymer-ceramic hybrid solid electrolyte, which is one of the most efficient way to improve the performance of SPEs. The first part focuses on polymer-lithium salt (LiX) matrices, including their ionic conduction mechanism and impact factors for their ionic conductivity. In the second part, the influence of both active and passive ceramic fillers on SPEs are reviewed. In the third part, composite SPEs’ preparation methods, including solvent casting and thermocompression, are introduced and compared. Finally, we propose five key points on how to make composite SPEs with high ionic conductivity for reference.

Conduction Properties of PTMSPMA-PEO and its Application as Polymer Electrolyte in LiFePO4 Batteries

2015 ◽  
Vol 827 ◽  
pp. 125-130 ◽  
Author(s):  
Sahrul Hidayat ◽  
Orina Amelia ◽  
Iman Rahayu ◽  
Fitrilawati
Keyword(s):  
Polymer Electrolyte ◽  
Room Temperature ◽  
Solution Method ◽  
Ionic Conduction ◽  
Electrochemical Impedance ◽  
Sol Gel ◽  
Lithium Ion ◽  
Constant Current ◽  
Coin Cell ◽  
Conduction Properties

The conduction properties of polymer composite PTMSPMA-PEO as electrolyte in lithium-ion batteries has been investigated. The gel polymer of PTMSPMA was synthesized by sol-gel method using 3-(Trimethoxysilyl)-propyl-methacrylate as monomer. The Composite of PTMSPMA-PEO with various composition (50:50, 60:40, 80:20; wt%) was made by solution method. The polymer electrolyte was composed of LiClO4salt dissolved in propylene carbonate and mixed with PTMSPMA-PEO. The ionic conduction of polymer electrolyte was characterized by electrochemical impedance spectroscopy. The battery performance of polymer electrolyte was estimated with coin cell, where LiFePO4was used as cathode and graphite was use as anode. The high ionic conductivity of 6.67 x10-3S/cm has been observed for the composition of PTMSPMA : PEO 60:40 (wt%) in room temperature. The performance of cell battery was investigated by charge-discharge using constant current 0,1 mA/cm2. The operational voltage of cell battery is around 1 V until 2.2 Volt with Columbic efficiency around 60%.

One-Step Mechanochemical Synthesis and Enhanced Ionic Conductivity of AgI-Al2O3 Composite Materials

2015 ◽  
Vol 70 (1) ◽  
pp. 17-21
Author(s):  
Mohamad M. Ahmad
Keyword(s):  
Composite Materials ◽  
Ionic Conductivity ◽  
Considerable Increase ◽  
Ionic Conduction ◽  
X Ray Diffraction ◽  
Two Phase ◽  
X Ray ◽  
Al2o3 Composite ◽  
One Step ◽  
Conduction Properties

AbstractAgI-Al2O3 composite materials have been prepared by mechanical milling technique at room temperature. The product materials were characterised by X-ray diffraction and showed the characteristics of γ-AgI phase. The ionic conduction properties of the composite materials were studied by impedance spectroscopy measurements in the 300- to 470-K temperature range. A considerable increase in ionic conductivity by three orders of magnitude was observed in the composite materials compared with the pristine β-AgI phase. The enhanced ionic conductivity could be assigned to the increased defect concentration and the formation of two phase mixtures with the insulating Al2O3.

scholarly journals Synthesis and Ionic Conductivity of Phosphate-Sulfate Fluorapatites Ca10-xNax(PO4)6-x(SO4)xF2 (x = 0;3;6)

2021 ◽  
Author(s):  
faten nouri ◽  
riadh ternane ◽  
malika ayadi
Keyword(s):  
Solid State ◽  
Ionic Conductivity ◽  
Ionic Conduction ◽  
Ionic Conductivities ◽  
Negative Temperature ◽  
Impedance Analysis ◽  
Hexagonal System ◽  
Raman Scattering Spectroscopy ◽  
Wide Range ◽  
Different Temperatures

Abstract BackgroundSolid-state electrolytes for Solid Oxide Fuel Cells (SOFC) with high ionic conductivities has attracted great interest for electrochemical applications because of their interesting ionic conduction. MethodsComples impedance spectroscopy (CIS) was used to study the electrical properties of Phosphate-sulfatefluorapatite.FindingsPhosphate-sulfatefluorapatite Ca10-xNax(PO4)6-x(SO4)xF2(x = 0;3;6) ,have been synthesized by the solid-state reaction at high temperature.The samples have been characterized by X-ray Diffraction(XRD), Fourier transform infrared spectroscopy (FTIR), Raman scattering spectroscopy, and Transmission Electron Microscopy (TEM) techniques. XRD study shows that these materials crystallize in the hexagonal system with P63/m as a space group. An impedance analysis has been used to analyze the electrical behavior of the samples at different temperatures. Evidence of temperature-dependent electrical relaxation phenomena is observed. The bulk resistance decreases with increasing temperature, showing a typical negative temperature coefficient of resistance (NTCR).Ac-conductivity measurements have been performed on a wide range of frequencies and temperatures. The ionic conductivity follows the Arrhenius and the Jonscher laws.

scholarly journals Correlation Between Structural and Ionic Transport Properties of Lithium-ion Hybrid Gel Polymer Electrolytes Based PMMA-PLA

2021 ◽  
Author(s):  
Norfatihah Mazuki ◽  
M.Z. Kufian ◽  
Y. Nagao ◽  
Ahmad Salihin Samsudin
Keyword(s):  
Ionic Conductivity ◽  
Transport Properties ◽  
Polymer Electrolytes ◽  
Ionic Conduction ◽  
Lithium Ion ◽  
Cole Plot ◽  
Gel Polymer Electrolytes ◽  
Hybrid Polymer ◽  
Good Thermal Stability ◽  
Hybrid Gel

Abstract In this work, the investigation on hybrid gel polymer electrolytes (HGPEs) comprising polymethyl methacrylate (PMMA)-polylactic acid (PLA) incorporate with LiTFSI were carried out. The HGPEs samples were characterized for their structural, thermal and ionic conduction properties via FTIR, XRD, DSC, and EIS. FTIR analysis show the indication of the interaction between PMMA-PLA hybrid polymer and LiTFSI with the appearance of peak and changes in peak shifting at the coordinating site from polymer blend. The DSC analysis shows that the glass transition temperature (Tg) of HGPEs was decreased as the LiTFSI content increases, suggesting that the HGPEs system has good thermal stability. The ionic conductivity was calculated based on the Cole-Cole plot and the incorporation of LiTFSI with 20 wt. % into hybrid polymer matrixes revealed the maximum ionic conductivity of 1.02 х 10-3 S cm-1 at room temperature as the amorphous phase increases. The dissociation of ions and transport properties of the PMMA-PLA-LiTFSI systems was determined via dielectric response approach and it was found that number density (ɳ), mobility (μ), and diffusion coefficient (D) of mobile ions follows ionic conductivity trend.

scholarly journals Fabrication and Analysis of Near-Field Electrospun PVDF Fibers with Sol-Gel Coating for Lithium-Ion Battery Separator

Membranes ◽  
2021 ◽  
Vol 11 (3) ◽  
pp. 186
Author(s):  
Mark D. Francisco ◽  
Cheng-Tang Pan ◽  
Bo-Hao Liao ◽  
Mao-Sung Wu ◽  
Ru-Yuan Yang ◽  
...  
Keyword(s):  
Ionic Conductivity ◽  
Specific Capacitance ◽  
Near Field ◽  
Sol Gel ◽  
Lithium Ion ◽  
Nonwoven Fabric ◽  
Electrospun Fibers ◽  
Gel Method ◽  
Sol Gel Method ◽  
Microtensile Testing

Environmental and economic concerns are driving the demand for electric vehicles. However, their development for mass transportation hinges largely on improvements in the separators in lithium-ion batteries (LIBs), the preferred energy source. In this study, innovative separators for LIBs were fabricated by near-field electrospinning (NFES) and the sol-gel method. Using NFES, poly (vinylidene fluoride) (PVDF) fibers were fabricated. Then, PVDF membranes with pores of 220 nm and 450 nm were sandwiched between a monolayer and bilayer of the electrospun fibers. Nanoceramic material with organic resin, formed by the sol-gel method, was coated onto A4 paper, rice paper, nonwoven fabric, and carbon synthetic fabric. Properties of these separators were compared with those of a commercial polypropylene (PP) separator using a scanning electron microscope (SEM), microtensile testing, differential scanning calorimetry (DSC), ion-conductivity measurement, cyclic voltammetry (CV), and charge-discharge cycling. The results indicate that the 220 nm PVDF membrane sandwiched between a bilayer of electrospun fibers had excellent ionic conductivity (~0.57 mS/cm), a porosity of ~70%, an endothermic peak of ~175 °C, better specific capacitance (~356 mAh/g), a higher melting temperature (~160 °C), and a stable cycle performance. The sol-gel coated nonwoven fabric had ionic conductivity, porosity, and specific capacitance of ~0.96 mS/cm., ~64%, and ~220 mAh/g, respectively, and excellent thermal stability despite having a lower specific capacitance (65% of PP separator) and no peak below 270 °C. The present study provides a significant step toward the innovation of materials and processes for fabricating LIB separators.

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