scholarly journals Effect of Sintering Process on Ionic Conductivity of Li7-xLa3Zr2-xNbxO12 (x = 0, 0.2, 0.4, 0.6) Solid Electrolytes

Materials ◽  
2021 ◽  
Vol 14 (7) ◽  
pp. 1671
Author(s):  
Lei Ni ◽  
Zhigang Wu ◽  
Chuyi Zhang
Keyword(s):  
Ionic Conductivity ◽  
Solid Electrolytes ◽  
High Performance ◽  
Room Temperature ◽  
Process Conditions ◽  
Sintering Process ◽  
Preparation Time ◽  
Conventional Solid State Reaction ◽  
Good Crystallinity ◽  
The Relationship

Garnet-type Li7La3Zr2O12 (LLZO) is considered as a promising solid electrolyte. Nb-doped LLZO ceramics exhibit significantly improved ion conductivity. However, how to prepare the Nb-doped LLZO ceramics in a simple and economical way, meanwhile to investigate the relationship between process conditions and properties in Li7-xLa3Zr2-xNbxO12 ceramics, is particularly important. In this study, Li7-xLa3Zr2-xNbxO12 (LLZNxO, x = 0, 0.2, 0.4, 0.6) ceramics were prepared by conventional solid-state reaction. The effect of sintering process on the structure, microstructure, and ionic conductivity of LLZNxO (x = 0, 0.2, 0.4, 0.6) ceramics was investigated. Due to the more contractive Nb-O bonds in LLZNxO ceramics, the cubic structures are much easier to form and stabilize, which could induce the decreased preparation time. High-performance garnet LLZNxO ceramics can be obtained by optimizing the sintering process with lower calcining temperature and shorter holding time. The garnet samples with x = 0.4 calcined at 850 °C for 10 h and sintered at 1250 °C for 4 h exhibit the highest ionic conductivity of 3.86 × 10−4 S·cm−1 at room temperature and an activation energy of 0.32 eV, which can be correlated to the highest relative density of 96.1%, and good crystallinity of the grains.

Effect of Al2O3 on Microstructure and Ionic Conductivity of Li7La3Zr2O12 Solid Electrolytes Prepared by Plasma Activated Sintering

2014 ◽  
Vol 616 ◽  
pp. 217-222 ◽  
Author(s):  
Yan Hua Zhang ◽  
Fei Chen ◽  
Rong Tu ◽  
Qiang Shen ◽  
Lian Meng Zhang
Keyword(s):  
Ionic Conductivity ◽  
Tetragonal Phase ◽  
Solid Electrolytes ◽  
High Performance ◽  
Room Temperature ◽  
Cubic Phase ◽  
Activated Sintering ◽  
Sintering Method ◽  
Total Ionic Conductivity ◽  
Plasma Activated Sintering

High performance Al-doped Li7La3Zr2O12 (LLZO) solid electrolytes were successfully prepared by plasma activated sintering method. The effect of Al2O3 concentration on the microstructure and ionic conductivity of Li7La3Zr2O12 was investigated. Without addition of Al2O3, only tetragonal phase was obtained at temperature range of 1000-1200 °C. Pure cubic phase of LLZO was obtained with the addition of 1.2-1.8 wt.% Al2O3. The pellet sintered at 1150 °C with 1.5 wt.% content of Al2O3 had a maximum relative density of 99.8 % with total ionic conductivity of 5.7×10−4 S/cm at room temperature. Al2O3 can stabilize the cubic LLZO phase which promotes the transformation of LLZO from tetragonal to cubic phase.

Effect of Control Technology on Properties of Quartz Porous Brick

2018 ◽  
Vol 777 ◽  
pp. 564-568 ◽  
Author(s):  
Long He ◽  
Jin Shi Li ◽  
Mei Hua Chen ◽  
Yan Yang ◽  
Xin Peng Lou ◽  
...  
Keyword(s):  
Compressive Strength ◽  
Quartz Sand ◽  
High Performance ◽  
Performance Test ◽  
Holding Time ◽  
Raw Material ◽  
Process Conditions ◽  
Low Grade ◽  
Sintering Process ◽  
Foaming Agent

A high-performance quartz sand insulation brick was prepared by using low grade quartz sand under different sintering process conditions. The optimum sintering process conditions were obtained by analyzing the relationship between microstructure and sintering process. Through the compounding, pulping, forming, drying and sintering processes, and the performance test of the porous brick, the following conclusions can be drawn, the comprehensive performance in all aspects, the porosity is similar, the preferred high compressive strength conditions, in order to get a best The bonding point, brick body sintering temperature of 1150 °C, porosity of 74.56%, compressive strength of 2.1 MPa of porous brick, and the pores are smooth, more uniform distribution. With the prolonging of the holding time, the porosity of the porous brick is reduced, and the performance is 1h, the porosity is 77.22% and the compressive strength is 2.05 MPa. When the raw material ratio is 60% quartz sand, 30wt% kaolin, calcium carbonate 9.6wt%, foaming agent 0.4wt%, water ratio 0.9 holding time at 1h sintering at 1150°C can get better porosity and compressive strength of the insulation brick. The porous material was sintered at 1150 °C, the content of foaming agent was 0.2wt%, the ratio of water to material was 0.9, and the compressive pressure and porosity were the better.

Polymer-in-salt solid electrolytes for lithium-ion batteries

2019 ◽  
Vol 12 (06) ◽  
pp. 1930006 ◽  
Author(s):  
Chengjun Yi ◽  
Wenyi Liu ◽  
Linpo Li ◽  
Haoyang Dong ◽  
Jinping Liu
Keyword(s):  
Ionic Conductivity ◽  
Lithium Ion Batteries ◽  
Smart Grids ◽  
Solid Electrolytes ◽  
Room Temperature ◽  
Lithium Salt ◽  
Lithium Ion ◽  
Solid Polymer Electrolytes ◽  
Solid Polymer ◽  
Polymer Lithium Ion Batteries

Solid-state polymer lithium-ion batteries with better safety and higher energy density are one of the most promising batteries, which are expected to power future electric vehicles and smart grids. However, the low ionic conductivity at room temperature of solid polymer electrolytes (SPEs) decelerates the entry of such batteries into the market. Creating polymer-in-salt solid electrolytes (PISSEs) where the lithium salt contents exceed 50[Formula: see text]wt.% is a viable technology to enhance ionic conductivity at room temperature of SPEs, which is also suitable for scalable production. In this review, we first clarify the structure and ionic conductivity mechanism of PISSEs by analyzing the interactions between lithium salt and polymer matrix. Then, the recent advances on polyacrylonitrile (PAN)-based PISSEs and polycarbonate derivative-based PISSEs will be reviewed. Finally, we propose possible directions and opportunities to accelerate the commercializing of PISSEs for solid polymer Li-ion batteries.

scholarly journals Effect of MnO2 Dopant on Properties of Na+-β/β"-Al2O3 Solid Electrolyte Prepared by a Synthesizing-cum-sintering Process

2021 ◽  
Vol 27 (1) ◽  
pp. 68-76
Author(s):  
Dae-Han LEE ◽  
Jin-Sik KIM ◽  
Young-Hyuk KIM ◽  
Sung-Ki LIM
Keyword(s):  
Ionic Conductivity ◽  
Solid Electrolyte ◽  
Phase Formation ◽  
Growth Promotion ◽  
Synthesis Temperature ◽  
Negative Influence ◽  
Ion Concentration ◽  
Sintering Process ◽  
Conventional Solid State Reaction ◽  
Β Phase

In order to simplify the complexity of the conventional solid-state reaction process, Na+-β/β″-Al2O3 as a fast Na+-ionic conductive solid electrolyte was fabricated using a synthesizing-cum-sintering process combined with the double-zeta method, which is able to distribute a small amount of Li2O more homogeneously in the Na2O-Al2O3-Li2O system. Additionally, in order to enhance the ionic conductivity, MnO2 was used as a dopant to increase the Na+-ion concentration on the conduction plane in the Na+-β/β″-Al2O3 crystal structure. The relative sintered density increased with the synthesis temperature, ultimately reaching 99.7 % after synthesis at 1400 °C. The phase formation showed an overall β″-phase fraction over 90 %. The addition of MnO2 had a positive effect on the phase formation, but a negative influence on the relative density resulting from the grain growth promotion effect. The highest ionic conductivity was observed at 1.74 × 10-1 S/cm (350 °C) for the sample sintered at 1600 °C with 0.5 wt.% MnO2.

scholarly journals Room-Temperature Mg-Ion Conduction Through Molecular Crystal Mg{N(SO2CF3)2}2(CH3OC5H9)2

2021 ◽  
Vol 9 ◽  
Author(s):  
Takaaki Ota ◽  
Shota Uchiyama ◽  
Keiichi Tsukada ◽  
Makoto Moriya
Keyword(s):  
Crystal Structure ◽  
Solid State ◽  
Ionic Conductivity ◽  
Molecular Crystal ◽  
Solid Electrolytes ◽  
Room Temperature ◽  
Molecular Crystals ◽  
Transference Number ◽  
Ion Conducting ◽  
State Ionic

Molecular crystals have attracted increasing attention as a candidate for innovative solid electrolytes with solid-state Mg-ion conductivity. In this work, we synthesized a novel Mg-ion-conducting molecular crystal, Mg{N(SO2CF3)2}2(CH3OC5H9)2 (Mg(TFSA)2(CPME)2), composed of Mg bis(trifluoromethanesulfonyl)amide (Mg(TFSA)2) and cyclopentyl methyl ether (CPME) and elucidated its crystal structure. We found that the obtained Mg(TFSA)2(CPME)2 exhibits solid-state ionic conductivity at room temperature and a high Mg-ion transference number of 0.74. Contrastingly, most Mg-conductive inorganic solid electrolytes require heating above 150–300°C to exhibit ionic conductivity. These results further prove the suitability of molecular crystals as candidates for Mg-ion-conducting solid electrolytes.

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.

Organic–inorganic hybrid electrolytes from ionic liquid-functionalized octasilsesquioxane for lithium metal batteries

2017 ◽  
Vol 5 (34) ◽  
pp. 18012-18019 ◽  
Author(s):  
Guang Yang ◽  
Chalathorn Chanthad ◽  
Hyukkeun Oh ◽  
Ismail Alperen Ayhan ◽  
Qing Wang
Keyword(s):  
Ionic Liquid ◽  
Solid State ◽  
Ionic Conductivity ◽  
Solid Electrolytes ◽  
Room Temperature ◽  
Electrochemical Stability ◽  
Lithium Metal ◽  
Inorganic Hybrid ◽  
Lithium Metal Batteries

Ionic liquid-based solid electrolytes with outstanding room-temperature ionic conductivity and excellent electrochemical stability are developed for all-solid-state Li metal batteries.

On the complexity of the relationship between microstructure and tensile properties in cast aluminum

2015 ◽  
Vol 29 (10n11) ◽  
pp. 1540011 ◽  
Author(s):  
Anton Bjurenstedt ◽  
Salem Seifeddine ◽  
Anders E. W. Jarfors
Keyword(s):  
Mechanical Properties ◽  
Aluminum Alloys ◽  
High Performance ◽  
Casting Process ◽  
Process Quality ◽  
Material Strength ◽  
Process Conditions ◽  
Cast Aluminum ◽  
Handling Practices ◽  
The Relationship

The relationship between microstructure and mechanical properties in cast aluminum alloys is complex and is strongly affected by the casting process conditions and melt handling practices. The aim of the current work is to understand the critical interactions between material microstructure, mechanical properties and process quality in the development of high performance aluminum alloys. The mechanical properties were investigated and correlated with microstructural features such as porosity, Fe -rich particles, secondary dendrite arm spacing (SDAS) and Si -particle length. The correlation with process quality measures such as bifilm index, density index and sludge factor (SF) were also investigated. The Si -particle lengths were found to explain variation in material strength and ductility which factors such as the bifilm index and porosity could not.

scholarly journals Influence of synthesis parameters on crystallization behavior and ionic conductivity of the Li4PS4I solid electrolyte

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Florian Strauss ◽  
Jing Lin ◽  
Jürgen Janek ◽  
Torsten Brezesinski
Keyword(s):  
Solid Electrolytes ◽  
High Performance ◽  
Room Temperature ◽  
Crystallization Behavior ◽  
Ionic Conductivities ◽  
Li Ion Batteries ◽  
Thermally Induced ◽  
Synthesis Parameters ◽  
Li Ion ◽  
Induced Crystallization

AbstractSuperionic solid electrolytes are key to the development of advanced solid-state Li batteries. In recent years, various materials have been discovered, with ionic conductivities approaching or even exceeding those of carbonate-based liquid electrolytes used in high-performance Li-ion batteries. Among the different classes of inorganic solid electrolytes under study, lithium thiophosphates are one of the most promising due to their high Li-ion conductivity at room temperature and mechanical softness. Here, we report about the effect of synthesis parameters on the crystallization behavior and charge-transport properties of Li4PS4I. We show that thermally induced crystallization of Li4PS4I (P4/nmm), starting from the glassy phase 1.5Li2S–0.5P2S5–LiI, adversely affects the material’s conductivity. However, both conductivity and crystallization temperature can be significantly increased by applying pressure during the preparation.

scholarly journals Enhanced Li-Ion Conductivity in Nanosized Li10GeP2S12

2020 ◽  
Author(s):  
James Dawson ◽  
Saiful Islam
Keyword(s):  
Solid Electrolytes ◽  
High Performance ◽  
Room Temperature ◽  
Ion Conductivity ◽  
Research Activity ◽  
Ion Conductivities ◽  
Significant Research ◽  
Solid State Batteries ◽  
Li Ion ◽  
Bulk System

<div>The discovery of the lithium superionic conductor Li10GeP2S12 (LGPS) has led to significant research activity on solid electrolytes for high-performance and safe solid-state batteries. LGPS exhibits a remarkably high room-temperature Li-ion conductivity of 12 mS/cm, comparable to</div><div>that of the liquid electrolytes used in current Li-ion batteries. Here, we predict that nanosizing of LGPS can be used to further enhance its already outstanding Li-ion conductivity. By utilizing state-of-the-art nanoscale molecular dynamics techniques, we are able to simulate the Li-ion conductivities of nanocrystalline LGPS systems with average grain sizes from 10 to 2 nm. Our results reveal that the Li-ion conductivity of LGPS increases with decreasing grain volume. For the smallest nanometric grain size, the Li-ion conductivity at room temperature is three times higher that of the bulk system. These findings reveal that nanosizing LGPS and related solid electrolytes could be an effective approach for enhancing their Li-ion conductivity.</div>

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