A comparative Study of Physic-Chemical Properties of Certain Cerium Doped Li7La3-xCexZr2O12 Ceramic Oxides

2020 ◽  
Author(s):  
v jaisankar ◽  
KC Dharanibalaji ◽  
E K T Sivakumar
Keyword(s):  
Ionic Conductivity ◽  
Surface Morphology ◽  
Surface Active Agent ◽  
Sol Gel ◽  
Active Agent ◽  
Lithium Ion ◽  
Complexing Agent ◽  
Promising Alternative ◽  
Ceramic Oxide ◽  
Alternative Material

Abstract Solid-state electrolytes have emerged as a promising alternative material for next-generation Li-ion batteries due to their safety and reliability. In this investigation, we report the synthesis of Cerium(Ce) doped Li7La3Zr2O12(LLZO) ceramic oxide which has a garnet-like structure and in which Ce3+ typically occupies La3+ sites. The synthesised LLZO ceramic oxide is doped with various weight percentages of cerium(Ce3+) by sol-gel method using oxalic acid as a complexing agent and ethane-1,2-diol as a surface-active agent. The synthesised Li7La3-xCexZr2O12 garnet is screened for surface morphology, chemical composition, and phase transition by various analytical techniques. The surface morphology and composition were analysed by HR-SEM with EDX analysis respectively. The cubic face formed was confirmed by XRD results. Thermogravimetric analysis indicates the thermal stability of the prepared materials. The effect of addition of various weight percentages of cerium with LLZO on ionic conductivity was analysed using ac impedance spectroscopy and compared. The maximum ionic conductivity measured was 6.34×10-5Scm-1. The potential window was examined by cyclic voltammetry (CV), which showed that the lithium deposition and dissolution peak appeared around 0V.Li+/Li and no further reaction beyond 5.8V vs Li+/Li.The results showed that these materials could be used as a potential alternative material in the fabrication of lithium-ion batteries.

scholarly journals Silicon Conversion From Bamboo Leaf Silica By Magnesiothermic Reduction for Development of Li-ion Baterry Anode

2018 ◽  
Vol 156 ◽  
pp. 05021 ◽  
Author(s):  
Silviana Silviana ◽  
Wardhana J. Bayu
Keyword(s):  
Sol Gel ◽  
Lithium Ion ◽  
Spherical Shape ◽  
Magnesiothermic Reduction ◽  
Promising Alternative ◽  
Xrd Pattern ◽  
Bamboo Leaves ◽  
Alternative Material ◽  
Mixed Material ◽  
Li Ion

Silicon (Si) is a promising alternative material for the anode Lithium ion Battery (LIB). Si has a large theoretical capacity about 3579 mA hg-1, ten times greater than the commercial graphite anode (372 mA hg-1). Bamboo is a source of organic silica (bio-silica). Most part biogenetic content of SiO2 is obtained in bamboo leaves. This paper aims to investigate the synthesis nano Si from bamboo leaves through magnesiothermic reduction after silica extraction using sol–gel method and to observe nano Si of bamboo leaf as mixed material for lithium ion baterry. Silica and silicon content was determined using XRF. Silica product has 96,3 wt. % yield of extraction from bamboo leaf, while silicon yield was obtained 61.2 wt. %. The XRD pattern revealed that silica and silicon product were amourphous. The extracted silica and silicon from bambo leaf has spherical shape and agglomerated form. As anoda material for LIB, silicon product achieved 0,002 mAh capacity for 22 cycle.

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.

CuO-CoO-MnO/SiO2 Nanocomposite Aerogel as Catalysts Carrier and Its Cocatalysis Mechanism in the Synthesis of Diphenyl Carbonate

2011 ◽  
Vol 284-286 ◽  
pp. 707-710 ◽  
Author(s):  
Yue Qing Zhao ◽  
Qian Yi Jia ◽  
Ying Hua Liang ◽  
Hong Xia Guo ◽  
Feng Feng Li ◽  
...  
Keyword(s):  
Transition Metals ◽  
Surface Active Agent ◽  
Sol Gel ◽  
Active Agent ◽  
Supercritical Drying ◽  
Diphenyl Carbonate ◽  
Impregnation Method ◽  
Sol Gel Process ◽  
Surface Active

CuO-CoO-MnO/SiO2 nanocomposite aerogel as catalysts carrier was prepared via sol-gel process and CO2supercritical drying (SCD) technique. Catalyst supported by the nanocomposite aerogel was prepared via impregnation method. The catalyst was used for the synthesis of diphenyl carbonate (DPC), and the yield of DPC in mass is up to 26.31%. The catalysis system of PdCl2/Co(OAc)2-Cu(OAc)2-Mn(OAc)2/TBAB/H2BQ is favorable to the synthesis of DPC. PdCl2, acetates of transition metals and H2BQ were the key catalyst, inorganic cocatalyst and organic cocatalyst, respectively. TBAB was the surface active agent of Pd0and stabilizer of Pd2+in the catalysis system.

scholarly journals Blend Hybrid Solid Electrolytes Based on LiTFSI Doped Silica-Polyethylene Oxide for Lithium-Ion Batteries

Membranes ◽  
2019 ◽  
Vol 9 (9) ◽  
pp. 109 ◽  
Author(s):  
Jadra Mosa ◽  
Jonh Fredy Vélez ◽  
Mario Aparicio
Keyword(s):  
Ionic Conductivity ◽  
Solid Electrolytes ◽  
Room Temperature ◽  
Sol Gel ◽  
Lithium Ion ◽  
Hybrid Structure ◽  
Hybrid Network ◽  
Li Ion Batteries ◽  
Li Ion ◽  
Sol Gel Synthesis

Organic/inorganic hybrid membranes that are based on GTT (GPTMS-TMES-TPTE) system while using 3-Glycidoxypropyl-trimethoxysilane (GPTMS), Trimethyletoxisilane (TMES), and Trimethylolpropane triglycidyl ether (TPTE) as precursors have been obtained while using a combination of organic polymerization and sol-gel synthesis to be used as electrolytes in Li-ion batteries. Self-supported materials and thin-films solid hybrid electrolytes that were doped with Lithium bis(trifluoromethanesulfonyl)imide (LiTFSI) were prepared. The hybrid network is based on highly cross-linked structures with high ionic conductivity. The dependency of the crosslinked hybrid structure and polymerization grade on ionic conductivity is studied. Ionic conductivity depends on triepoxy precursor (TPTE) and the accessibility of Li ions in the organic network, reaching a maximum ionic conductivity of 1.3 × 10−4 and 1.4 × 10−3 S cm−1 at room temperature and 60 °C, respectively. A wide electrochemical stability window in the range of 1.5–5 V facilitates its use as solid electrolytes in next-generation of Li-ion batteries.

Sol-Gel Non-hydrolytic Synthesis of a Nanocomposite Electrolyte for Application in Lithium-ion Devices

2004 ◽  
Vol 822 ◽  
Author(s):  
Flávio L. Souza ◽  
Paulo R. Bueno ◽  
Ronaldo C. Faria ◽  
Elson Longo ◽  
Edson R. Leite
Keyword(s):  
Ionic Conductivity ◽  
Room Temperature ◽  
Sol Gel ◽  
Specific Treatment ◽  
Lithium Ion ◽  
Polymeric Chain ◽  
Conductivity Measurements ◽  
Ion Conductor ◽  
Nanocomposite Electrolyte ◽  
Excellent Reproducibility

AbstractA new nanocomposite electrolyte was synthesized using a simple non-hydrolytic sol-gel route without specific treatment of the reagents. The nanocomposite ion conductor was prepared with citric acid, tetraethyl orthosilicate and ethylene glycol, forming polyester chains. The time-consuming drying step that is a necessary part of most chemical syntheses was not required in the preparation of the present nanocomposite electrolyte of the polyelectrolyte class, because only Li+ is mobile in the polymeric chain. The effects of the concentration of Li, SiO 2 and SnO2nanoparticles were investigated in terms of Li+ ionic conductivity. Conductivity measurements as a function of the metal oxide nanocrystal content in the nanocomposite revealed a significant increase in conductivity at approximately 5 and 10 wt % of nanoparticles. The new nanocomposite conductor proved to be fully amorphous at room temperature, with a vitreous transition temperature of approximately 228K (−45°C). The material is solid and transparent, displaying an ionic conductivity of 10−4to 10−5 (O.cm)−1at room temperature presenting excellent reproducibility of all these characteristics. Cyclic voltammetry measurements indicate that the hybrid electrolyte possesses outstanding electrochemical stability.

scholarly journals Effect of SiO2 Nanoparticles on the Performance of PVdF-HFP/Ionic Liquid Separator for Lithium-Ion Batteries

Nanomaterials ◽  
2018 ◽  
Vol 8 (11) ◽  
pp. 926 ◽  
Author(s):  
Stefano Caimi ◽  
Antoine Klaue ◽  
Hua Wu ◽  
Massimo Morbidelli
Keyword(s):  
Ionic Conductivity ◽  
Lithium Ion Batteries ◽  
Polymer Matrix ◽  
Room Temperature ◽  
Lithium Ion ◽  
Sio2 Nanoparticles ◽  
Alumina Nanoparticles ◽  
Promising Alternative ◽  
The Matrix ◽  
Novel Method

Safety concerns related to the use of potentially explosive, liquid organic electrolytes in commercial high-power lithium-ion batteries are constantly rising. One promising alternative is to use thermally stable ionic liquids (ILs) as conductive media, which are however, limited by low ionic conductivity at room temperature. This can be improved by adding fillers, such as silica or alumina nanoparticles (NPs), in the polymer matrix that hosts the IL. To maximize the effect of such NPs, they have to be uniformly dispersed in the matrix while keeping their size as small as possible. In this work, starting from a water dispersion of silica NPs, we present a novel method to incorporate silica NPs at the nanoscale level (<200 nm) into PVdF-HFP polymer clusters, which are then blended with the IL solution and hot-pressed to form separators suitable for battery applications. The effect of different amounts of silica in the polymer matrix on the ionic conductivity and cyclability of the separator is investigated. A membrane containing 10 wt.% of silica (with respect to the polymer) was shown to maximize the performance of the separator, with a room temperature ionic conductivity of of 1.22 mS cm − 1 . The assembled half-coin cell with LiFePO 4 and Li as the cathode and the anode exhibited a capacity retention of more than 80% at a current density of 2C and 60 ∘ C.

scholarly journals Characterization of LiCo Nanopowders Produced by Sol-Gel Processing

2010 ◽  
Vol 2010 ◽  
pp. 1-8 ◽  
Author(s):  
Sina Soltanmohammad ◽  
Sirous Asgari
Keyword(s):  
Thermal Analyses ◽  
Sol Gel ◽  
Lithium Ion ◽  
Chelating Agent ◽  
Complexing Agents ◽  
Complexing Agent ◽  
Transmission Electron ◽  
Sol Gel Process ◽  
Size And Morphology ◽  
Gel Processing

LiCo nanopowders, one of the most important cathode materials for lithium-ion batteries, were synthesized via a modified sol-gel process assisted with triethanolamine (TEA) as a complexing agent. The influence of three different chelating agents including acrylic acid, citric acid, and oxalic acid on the size and morphology of particles was investigated. Structure and morphology of the synthesized powders were characterized by thermogravimetric/differential thermal analyses (TG/DTA), X-ray diffraction (XRD), and transmission electron microscopy (TEM). Results indicate that the powder processed with TEA and calcinated at 800 had an excellent hexagonal ordering of -NaFe-type (space group Rm). Also, the other three complexing agents had a decisive influence on the particle size, shape, morphology, and degree of agglomeration of the resulting oxides. Based on the data presented in this work, it is proposed that the optimized size and distribution of LiCo powders may be achieved through sol-gel processing using TEA as a chelating agent.

Study on the Surface Morphology of PVdF-LiBOB Solid Polymer Electrolyte with TiO2 Filler for Lithium-Ion Battery Application

2016 ◽  
Vol 864 ◽  
pp. 159-162 ◽  
Author(s):  
Christin Rina Ratri ◽  
Qolby Sabrina
Keyword(s):  
Ionic Conductivity ◽  
Surface Morphology ◽  
Polymer Electrolyte ◽  
Solid Polymer Electrolyte ◽  
Polymer Electrolyte Membrane ◽  
Lithium Ion ◽  
Solid Polymer ◽  
Ac Impedance Spectroscopy ◽  
Electrolyte Membrane ◽  
Battery Application

Solid polymer electrolyte with PVdF polymer and LiBOB salt has been prepared with doctor blade method. To improve the membrane ionic conductivity, TiO2 has been added. Surface morphology analysis was performed using SEM and EDX spectroscopy. Conductivity behaviour was studied with AC impedance spectroscopy (EIS). SEM and EDX analysis results have shown that TiO2 addition played a role in pore formation on solid polymer electrolyte membrane. The highest value of ionic conductivity in PVdF-LiBOB solid polymer electrolyte system in this research was found to be 5.79% x 10-6 Scm-1 in room temperature, i.e sample with 30% TiO2 addition. It was also studied that agglomeration of TiO2 particle occurred on the surface of the membrane resulted in decreasing of ionic conductivity.

Preparation and Characterization of Alumina Nanoparticles from Alkoxides and Na (AOT) Surfactant

2007 ◽  
Vol 544-545 ◽  
pp. 785-788
Author(s):  
Yong Kap Park
Keyword(s):  
Surface Active Agent ◽  
Sol Gel ◽  
Active Agent ◽  
Precursor Solution ◽  
Phase Changes ◽  
Alumina Nanoparticles ◽  
Transmission Electron ◽  
Dsc Analyses ◽  
Size And Morphology ◽  
Α Al2o3

Nanosized α-aluminum oxides have been prepared by hydrolysis of aluminum alkoxides using a sol-gel procedure. The Na(AOT) as a surface active agent was added into the alumina precursor solution to investigate the influence on size and morphology of alumina particles. The product phase was mainly boehmite with mean particle size of 20~30 nm. The crystal phases and morphology of the alumina nanoparticles were analyzed by X-ray diffractometry and by transmission electron microscopy, respectively. The TEM observations revealed that α-Al2O3 with about 80 nm spherical and hexagonal shapes was formed after calcination at 1200oC. The TG/DSC analyses were also done to determine the phase changes of alumina precursors from room temperature to 1200oC.

A New Type of Lithium Ion Battery Cathode Material of Lithium Iron Phosphate Water-Based Composite Binder Research

2014 ◽  
Vol 487 ◽  
pp. 157-160
Author(s):  
Lei Li ◽  
Xian Yu Zhang ◽  
Hong Wei Wang ◽  
Xin Ge Wang ◽  
Xiu Ling Wei ◽  
...  
Keyword(s):  
Lithium Iron Phosphate ◽  
Surface Active Agent ◽  
Active Agent ◽  
Lithium Ion ◽  
Iron Phosphate ◽  
Good Effect ◽  
Styrene Butadiene Rubber ◽  
Butadiene Rubber ◽  
Water Based ◽  
Styrene Butadiene

Gelatin and polyethylene oxide and styrene-butadiene rubber to blend with water as solvents, and add to improve adhesion surface active agent, the composition of multi-component blend to lithium iron phosphate batteries battery anode materials have the effect of adhesion. Experiments show that the multi-component water-based adhesives in lithium iron phosphate coating process good effect.

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