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电解质的导电性实验的改进及探究
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作者 卢再生 《教育教学论坛》 2011年第22期229-229,共1页
现行九年级化学教材中电解质的导电性实验教材和教参中的实验方案不适合课堂教学,若按教材、教参进行实验,很有可能导致实验失败。笔者经过反复实验,找出最佳试剂浓度,最佳实验装置。在保证最佳实验效果的前提下,使药品消耗大大降低了。
关键词 电解质导电性实验 最佳实验效果 最佳试剂浓度 最佳实验装置
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Machine Learning Approach Accelerates Search for Solid State Electrolytes
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作者 Le Tang Guozhen Zhang Jun Jiang 《Chinese Journal of Chemical Physics》 SCIE EI CAS CSCD 2024年第4期505-512,I0039-I0041,I0094,共12页
In the current aera of rapid development in the field of electric vehicles and electrochemical energy storage,solid-state battery technology is attracting much research and attention.Solid-state electrolytes,as the ke... In the current aera of rapid development in the field of electric vehicles and electrochemical energy storage,solid-state battery technology is attracting much research and attention.Solid-state electrolytes,as the key component of next-generation battery technology,are favored for their high safety,high energy density,and long life.However,finding high-performance solid-state electrolytes is the primary challenge for solid-state battery applications.Focusing on inorganic solid-state electrolytes,this work highlights the need for ideal solid-state electrolytes to have low electronic conductivity,good thermal stability,and structural and phase stability.Traditional experimental and theoretical computational methods suffer from inefficiency,thus machine learning methods become a novel path to intelligently predict material properties by analyzing a large number of inorganic structural properties and characteristics.Through the gradient descent-based XGBoost algorithm,we successfully predicted the energy band structure and stability of the materials,and screened out only 194 ideal solid-state electrolyte structures from more than 6000 structures that satisfy the requirements of low electronic conductivity and stability simultaneously,which greatly accelerated the development of solid-state batteries. 展开更多
关键词 Solid-state battery Solid-state electrolyte XGBoost algorithm Low electronic conductivity Thermal stability
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大型预焙阳极电解槽启动期间技术参数的控制
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作者 靳宏臣 《材料与冶金学报》 CAS 2010年第S1期128-129,共2页
电解槽启动期间技术参数的控制十分关键,通过控制好槽工作电压、极距、电解质温度、电解质成分、电解质数量等技术参数,能使电解槽顺利启动,并且为电解槽以后高效平稳生产和延长槽寿命打下坚实基础.
关键词 大型预焙阳极电解 技术参数 电解质导电性 启动期 电解质温度 工作电压 延长槽寿命 电解质成分 极距 氧化铝浓度
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New pretreatment method for high-tension electrical separation of zircon from quartz 被引量:2
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作者 Sivash NOURI Fatemeh Sadat HOSEINIAN +1 位作者 Bahram REZAI Kamal SABERYAN 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2019年第8期1737-1743,共7页
Electrostatic separation is one of the mineral processing methods based on mineral conductivity.This method has some significant problems such as being sensitive to humidity,high middling product,and impurity of non-c... Electrostatic separation is one of the mineral processing methods based on mineral conductivity.This method has some significant problems such as being sensitive to humidity,high middling product,and impurity of non-conductive minerals.In this study,a new pretreatment method was proposed for the separation of zircon from quartz before electrostatic separation to solve these disadvantages.In this regard,two stages of pretreatment were applied which involved using collector of sodium dodecyl sulfate(SDS)for adjusting wettability of the zircon surface and spraying electrolyte aqueous solution to increase conductivity of the quartz surface.The effects of important parameters including pH,collector concentration,conditioning time,and concentration and type of electrolyte on the process efficiency were evaluated.The results showed that the optimal conditions of high-tension electrical separation were pH of 4,SDS concentration of 1×10-4 mol/L,conditioning time of 4 min and NaCl as an electrolyte with concentration of 4.27 mol/L.Separation efficiency of 95.12% was achieved in optimum conditions.This pretreatment method can be successfully used before high-tension electrical separation to separate the conductive or non-conductive minerals with various compositions. 展开更多
关键词 ZIRCON QUARTZ COLLECTOR electrolyte aqueous solution conductivity high-tension electrical separation surface treatment
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Theoretical Aspects on Doped-Zirconia for Solid Oxide Fuel Cells:from Structure to Conductivity 被引量:1
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作者 Shu-hui Guan Zhi-pan Liu 《Chinese Journal of Chemical Physics》 SCIE CAS CSCD 2021年第2期125-136,I0001,共13页
Solid oxide fuel cells(SOFCs)are regarded to be a key clean energy system to convert chemical energy(e.g.H_(2) and O_(2))into electrical energy with high efficiency,low carbon footprint,and fuel flexibility.The electr... Solid oxide fuel cells(SOFCs)are regarded to be a key clean energy system to convert chemical energy(e.g.H_(2) and O_(2))into electrical energy with high efficiency,low carbon footprint,and fuel flexibility.The electrolyte,typically doped zirconia,is the"state of the heart"of the fuel cell technologies,determining the performance and the operating temperature of the overall cells.Yttria stabilized zirconia(YSZ)have been widely used in SOFC due to its excellent oxide ion conductivity at high temperature.The composition and temperature dependence of the conductivity has been hotly studied in experiment and,more recently,by theoretical simulations.The characterization of the atomic structure for the mixed oxide system with different compositions is the key for elucidating the conductivity behavior,which,however,is of great challenge to both experiment and theory.This review presents recent theoretical progress on the structure and conductivity of YSZ electrolyte.We compare different theoretical methods and their results,outlining the merits and deficiencies of the methods.We highlight the recent results achieved by using stochastic surface walking global optimization with global neural network potential(SSW-NN)method,which appear to agree with available experimental data.The advent of machine-learning atomic simulation provides an affordable,efficient and accurate way to understand the complex material phenomena as encountered in solid electrolyte.The future research directions for design better electrolytes are also discussed. 展开更多
关键词 Solid oxide fuel cells Yttria stabilized zirconia CONDUCTIVITY Atomistic structure Theoretical aspects
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Preparation and properties of PEO/LiClO_4/KH560-SiO_2 composite polymer electrolyte by sol-gel composite-in-situ method 被引量:4
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作者 潘春跃 高金环 +2 位作者 张倩 冯庆 巢猛 《Journal of Central South University of Technology》 2008年第3期295-300,共6页
Composite polymer electrolytes based on polyethylene oxide(PEO) were prepared by using LiClO4 as doping salt and silane-modified SiO2 as filler. SiO2 was formed in-situ in (PEO)8LiClO4 matrix by the hydrolysis and con... Composite polymer electrolytes based on polyethylene oxide(PEO) were prepared by using LiClO4 as doping salt and silane-modified SiO2 as filler. SiO2 was formed in-situ in (PEO)8LiClO4 matrix by the hydrolysis and condensation reaction of Si(OC4H9)4. The crystallinity,morphology and ionic conductivity of composite polymer electrolyte films were examined by differential scanning calorimetry,scanning electron microscopy,atom force microscopy and alternating current impedance spectroscopy,respectively. Compared with the crystallinity of the unmodified SiO2 as inert filler,that of composite polymer electrolytes is decreased. The results show that silane-modified SiO2 particles are uniformly dispersed in (PEO)8LiClO4 composite polymer electrolyte film and the addition of silane-modified SiO2 increases the ionic conductivity of the (PEO)8LiClO4 more noticeably. When the mass fraction of SiO2 is about 10%,the conductivity of (PEO)8LiClO4-modified SiO2 attains a maximum value of 4.8×10-5 S·cm-1. 展开更多
关键词 polyethylene oxide(PEO) SOL-GEL composite-in-situ polymer electrolyte ionic conductivity
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Mg2+-ion Conducting Polymer Electrolytes: Materials Characterization and All-Solid-State Battery Performance Studies
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作者 Rakesh Chandra Agrawal Dinesh Kumar Sahu 《Journal of Physical Science and Application》 2013年第1期9-17,共9页
For All-Solid-State battery applications, Mg2+-ion conducting polymer electrolytes and Mg-metal electrode are currently considered as alternate choices in place of Li+-ion conducting polymer electrolytes/Li-metal el... For All-Solid-State battery applications, Mg2+-ion conducting polymer electrolytes and Mg-metal electrode are currently considered as alternate choices in place of Li+-ion conducting polymer electrolytes/Li-metal electrode. Present paper reports fabrication of All-Solid-State battery based on the following Mg2+-ion conducting nano composite polymer electrolyte (NCPE) films: [85PEO: 15Mg(C104)2] + 5% TiO2 (〈 100 nm), [85PEO: 15Mg(CIO4)2] + 3% SiO2(-8 nm). [85PEO: 15Mg(CIO4)2] + 3% MgO (〈 100 nm), [85PEO:15Mg(C1O4)2] + 3% MgO (-44 μm). NCPE films were prepared by hot-press technique. Solid Polymer Electrolyte (SPE) composition: [85PEO: 15Mg(CIO4)2], identified as high conducting film at room temperature, has been used as ISt--phase host and nano/micro particles of active (MgO)/passive (SiO2, TiO2) fillers as IInd-phase dispersoid. Filler particle dependent conductivity studies identified above mentioned NCPE films as optimum conducting composition (OCC) at room temperature. Ion transport behavior of SPE/NCPE film materials was investigated previously. Present paper reports materials characterization and cell performance studies on All-Solid-State batteries: Mg (Anode) Ⅱ SPE or NCPE films tt C+MnO2+Electrolyte (Cathode). Open circuit voltage (OCV) obtained was in the range: 1.79-1.92 V. The batteries were discharged at room temperature under different load conditions and some important battery parameters have been evaluated from plateau region of cell-potential discharge profiles. All the batteries performed quite satisfactorily specially under low current drain states. 展开更多
关键词 Solid polymer electrolyte (SPE) nano composite polymer electrolyte (NCPE) hot-press technique all-solid-state batteries.
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Fast-ionic conductor Li_(2.64)(Sc_(0.9)Ti_(0.1))_(2)(PO_(4))_(3) doped PVDF-HFP hybrid gel-electrolyte for lithium ion batteries
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作者 WANG Zhen-yu LI Cong +5 位作者 HUANG Ying-de HE Zhen-jiang YAN Cheng MAO Jing DAI Ke-hua ZHENG Jun-chao 《Journal of Central South University》 SCIE EI CAS CSCD 2022年第9期2980-2990,共11页
With increasing demand on energy density of lithium-ion battery,wide electrochemical window and safety performance are the crucial request for next generation electrolyte.Gel-electrolyte as a pioneer for electrolyte s... With increasing demand on energy density of lithium-ion battery,wide electrochemical window and safety performance are the crucial request for next generation electrolyte.Gel-electrolyte as a pioneer for electrolyte solidization development aims to solve the safety and electrochemical window problems.However,low ionic conductivity and poor physical performance prohibit its further application.Herein,a fast-ionic conductor(Li_(2.64)(Sc_(0.9)Ti_(0.1))_(2)(PO_(4))_(3))(LSTP)was added into poly(vinylidene fluoride-co-hexafluoropropylene)(PVDF-HFP)base gel-electrolyte to enhance mechanical properties and ionic conductivity.Evidences reveal that LSTP was able to weaken interforce between polymer chains,which increased the ionic conductibility and decreased interface resistance during the cycling significantly.The obtained LiFePO_(4)/hybrid gel-electrolyte/Li-metal coin cell exhibited excellent rate capacity(145 mA·h/g at 1C,95 mA·h/g at 3C,28℃)which presented a potential that can be comparable with commercialized liquid electrolyte system. 展开更多
关键词 lithium ion battery hybrid gel-electrolyte fast-ionic conductor inorganic filler electrochemical performance
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Screening possible solid electrolytes by calculating the conduction pathways using Bond Valence method 被引量:6
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作者 GAO Jian CHU Geng +4 位作者 HE Meng ZHANG Shu XIAO RuiJuan LI Hong CHEN LiQuan 《Science China(Physics,Mechanics & Astronomy)》 SCIE EI CAS 2014年第8期1526-1535,共10页
Inorganic solid electrolytes have distinguished advantages in terms of safety and stability, and are promising to substitute for conventional organic liquid electrolytes. However, low ionic conductivity of typical can... Inorganic solid electrolytes have distinguished advantages in terms of safety and stability, and are promising to substitute for conventional organic liquid electrolytes. However, low ionic conductivity of typical candidates is the key problem. As connective diffusion path is the prerequisite for high performance, we screen for possible solid electrolytes from the 2004 International Centre for Diffraction Data (ICDD) database by calculating conduction pathways using Bond Valence (BV) method. There are 109846 inorganic crystals in the 2004 ICDD database, and 5295 of them contain lithium. Except for those with toxic, radioactive, rare, or variable valence elements, 1380 materials are candidates for solid electrolytes. The rationality of the BV method is approved by comparing the existing solid electrolytes' conduction pathways we had calculated with those from ex- periments or first principle calculations. The implication for doping and substitution, two important ways to improve the conductivity, is also discussed. Among them LizCO3 is selected for a detailed comparison, and the pathway is reproduced well with that based on the density functional studies. To reveal the correlation between connectivity of pathways and conductivity, a/γ-LiAlO2 and Li2CO3 are investigated by the impedance spectrum as an example, and many experimental and theoretical studies are in process to indicate the relationship between property and structure. The BV method can calculate one material within a few minutes, providing an efficient way to lock onto targets from abundant data, and to investigate the struc- ture-property relationship systematically. 展开更多
关键词 solid electrolyte conduction pathway Bond Valence method material screening lithium-ion battery
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