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ionic conductivity of infiltrated Ln (Ln = Gd, Sm, Y)-doped ceria

Rare Metals 2018年第9期37卷 734-742页

作者： Jiang-Wei Ju Dao-Ming Huan Yan-Xiang Zhang Chang-Rong Xia Guang-Lei Cui Qingdao Industrial Energy Storage Research Institute Qingdao Institute of Bio-energy and Bio-process Technology Chinese Academy of Sciences Qingdao 266101 China Qingdao Key Laboratory of Solar Energy Utilization and Energy Storage Technology Qingdao Institute of Bio-energy and Bio- process Technology Chinese Academy of Sciences Qingdao 266101 China CAS Key Laboratory of Materials for Energy Conversion Department of Materials Science and Engineering & Collaborative Innovation Center of Suzhou Nano Science and Technology University of Science and Technology of China Hefei 230026 China National Key Laboratory for Precision Hot Pressing of Metals School of Materials Science and Engineering Harbin Institute of Technology Harbin 150001 China

This work studies the ionic conductivity of nanosized Gd-, Sm-, and Y-doped ceria prepared by the infiltration/impregnation method. The nanoparticles were deposited onto porous pure ceria substrates via infiltration- heating processes, and the conductivity was determined with the electrochemical impedance spectroscopy （EIS） using the conductive model for infiltrated phases. The conductivity of the infiltrated doped ceria changes with the doping amount, and Gd0.25Ce0.75O2-δ, Sm0.2Ce0.8O2-δ, and Y0.15Ce0.85O2-δ show the highest values of 2.56, 3.01, and 2.07 × 10-3 ***-1 at 600 ℃, respectively. Overall, Sin-doped samples show the highest conductivity, whileY-doped samples show the lowest conductivity. In con- sideration of the Bruggeman factor, the intrinsic conduc- tivity of the infiltrated doped ceria was calculated. Compared with the bulk doped ceria, the intrinsic con- ductivity is higher while the activation energy is lower, which may suggest different conduction mechanisms. Besides, co-doping effects on the conductivity of the infiltrated sample are less obvious than those of the bulk sample.

关键词： Doped ceria Infiltration ionic conductivity Solid oxide fuel cell Nanoparticle

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ionic conductivity study on electron beam irradiated polyacrylonitrile-polyethylene oxide gel

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Chinese Physics B 2011年第7期20卷 466-471页

作者：马艺准庞立龙朱亚滨王志光申铁龙 Institute of Modern Physics Graduate University of Chinese Academy of Sciences

Different mass percent polyacrylonitrile （PAN）-polyethylene oxide （PEO） gels were prepared and irradiated by an electron beam （EB） with energy of 1.0 MeV to the dose ranging from 13 kGy to 260 kGy. The gels were analysed by using Fourier transform infrared spectrum, gel fraction and ionic conductivity （IC） measurement. The results show that the gel is crosslinked by EB irradiation, the crosslinking degree rises with the increasing EB irradiation dose （ID） and the mass percents of both PAN and PEO contribute a lot to the crosslinking; in addition, EB irradiation can promote the IC of PAN-PEO gels. There exists an optimum irradiation dose, at which the IC can increase dramatically. The IC changes of the PAN-PEO gels along with ID are divided into three regions： IC rapidly increasing region, IC decreasing region and IC balanced region. The cause of the change can be ascribed to two aspects, gel capturing electron degree and crosslinking degree. By comparing the IC-ID curves of different mass percents of PAN and PEO in gel, we found that PAN plays a more important role for gel IC promotion than PEO, since addition of PAN in gel causes the IC-ID curve sharper, while addition of PEO in gel causes the curve milder.

关键词： polyacrylonitrile polyethylene oxide electron beam irradiation ionic conductivity

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ionic conductivity in Gelatin-Based Hybrid Solid Electrolytes:The Non-trivial Role of Nanoclay

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Journal of Materials Science & Technology 2014年第11期30卷 1096-1102页

作者： Ali Ghadami Nader Taheri Qazvini Nasser Nikfarjam Polymer Division School of ChemistryCollege of ScienceUniversity of Tehran Biomaterials Research Center (BRC) University of Tehran

In this study, the ionic conductivity behavior in hybrid gelatin-based transparent electrolytes including various types of nanoclays with different size, shape and surface properties was characterized. The effects of nanoclay type and nanoclay concentration as well as different experimental conditions, e.g., pH, temperature and crosslinking were also investigated. In general, the impedance spectroscopy results suggested a non- trivial role for nanoclay. Regardless of the nanoclay type, the ionic conductivity slightly increased first and then decreased by increasing the nanoclay concentration. Furthermore, among sodium montmorillonite （Na＋MMT）, lithium montmorillonite （Li＋MMT）, laponite and hydrotalcite, the hybrid electrolytes prepared by Li＋MMT showed higher ionic conductivity. The results also showed that the chemical crosslinking along with sample preparation at optimum pH, where the gelatin chains might be efficiently adsorbed on exfoliated, negatively charged clay nanosheets, plays an important role. In comparison with the ionic conductivity of the neat sample at room temperature （～10-7 S cm-1）, a ten-fold increase was observed for the crosslinked sample containing 2 wt% of Li^＋MMT prepared at optimum pH 3.5. The conductivity behavior as a function of temperature revealed the obedience with the VogeI-Fulcher-Tammann （VFT） model for all samples, suggesting the important role of segmental motions in the ionic conductivity. Finally, a qualitative explanation was presented for the mechanism of the ionic conduction in gelatin-nanoclay hybrid electrolytes.

关键词： Gelatin Solid-state electrolytes ionic conductivity Montmorillonitc Laponite Impedance spectroscopy

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ionic conductivity IN THE COMPLEXES OF COMB-SHAPED POLYETHER WITH LITHIUM AROMATIC SULFONATE

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Chinese Journal of Polymer Science 1993年第3期11卷 267-272页

作者：张升水仇卫华薛大翠刘庆国 Laboratory of Solid State ionics University of Science and Technology Beijing Beijing 100083

Complexes of comb-shaped polyether and lithium aromatic sulfonates bearing different negative charge number were prepared by in situ thermal polymerization. Their conductivity depends deeply on salt content, ambient temperature and negative charge number of the added salts. Results show that anions can be partly immobilized by increasing their negative charges at lower temperature. Against discharge time the short circuit current of the battery (Li/complex film/Li_x V_3O_8) is stabilized by increasing the anionic charge number of the complex.

关键词： Polymeric solid electrolyte ionic conductivity Comb-shaped polyether Lithium battery

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Bacterial Cellulose/Zwitterionic Dual-network Porous Gel Polymer Electrolytes with High ionic conductivity

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Journal of Wuhan University of Technology(Materials Science) 2024年第3期39卷 596-605页

作者：侯朝霞 WANG Haoran QU Chenying Liaoning Province Key Laboratory of Micro-nano Materials Research and Development School of Mechanical EngineeringShenyang UniversityShenyang 110044China

Bacterial cellulose(BC)was innovatively combined with zwitterionic copolymer acrylamide and sulfobetaine methacrylic acid ester[P(AM-co-SBMA)]to build a dual-network porous structure gel polymer electrolytes(GPEs)with high ionic *** dual network structure BC/P(AM-co-SBMA)gels were formed by a simple one-step polymerization *** results show that ionic conductivity of BC/P(AM-co-SBMA)GPEs at the room temperature are 3.2×10^(-2) S/cm@1 M H_(2)SO_(4),4.5×10^(-2) S/cm@4 M KOH,and 3.6×10^(-2) S/cm@1 M NaCl,*** active carbon(AC)as the electrodes,BC/P(AM-co-SBMA)GPEs as both separator and electrolyte matrix,and 4 M KOH as the electrolyte,a symmetric solid supercapacitors(SSC)(AC-GPE-KOH)was assembled and *** specific capacitance of AC electrode is 173 F/g and remains 95.0%of the initial value after 5000 cycles and 86.2%after 10,000 cycles.

关键词： bacterial cellulose zwitterion gel polymer electrolytes ionic conductivity dual-network structure

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A collagen-based electrolyte-locked separator enables capacitor to have high safety and ionic conductivity

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Journal of Energy Chemistry 2020年第8期29卷 324-332,I0011页

作者： Heng Xu Yaping Wang Xuepin Liao Bi Shi Biomass Chemistry and Engineering Department Sichuan UniversityChengdu 610065SichuanChina National Engineering Laboratory for Clean Technology of Leather Manufacture Sichuan UniversityChengdu 610065.SichuanChina Key Laboratory of Leather Chemistry and Engineering of Ministry of Education Sichuan UniversityChengdu 610065Sichuan.China

The conventional liquid electrolytes(LEs) have a high level of ionic conductivity;however, they often suffer from the poor processability and safety risks of potential leakage. Although solid-state electrolytes(SSEs) can solve these inherent problems of LEs, the ionic conductivity of most SSEs is several magnitudes lower than these of LEs. Herein, we report a novel strategy by building liquid ion-transport channels in a solid framework and prepared an electrolyte-locked separator(ELS) using a collagen fiber membrane(CFm). The liquid electrolyte was primarily infiltrated in the smaller voids of CFm, and its ionic conductivity could attain to 9.0×10-3 S cm-1 when the electrolyte absorption(EA) reached up to 112.0%. After centrifuging treatment, the electrolyte retentions(ER) and ionic conductivities of ELS were 108.93% and 8.37×10-3 S cm-1, respectively, which were much higher than those of commercial cellulose separator(CS), exerting excellent liquid-locking performances. In particular, the electrical double-layer capacitors(EDLC) assembled by ELS or CS were characterized and exhibited similar electrochemical performance,demonstrating the satisfactory ability and applicability of ELS for commercial use. In addition, the ELSbased EDLC exhibited favorable flexibility with relative lower loss of capacitance under different angles of bending.

关键词： Collagen fiber ionic conductivity Capillary force Electrolyte retention EDLC

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Enhancing ionic conductivity of garnet-type Nb-doped Li_(7)La_(3)Zr_(2)O_(12)by cerium doping

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Journal of Rare Earths 2024年第9期42卷 1740-1746,I0004页

作者： Daming Liu Yuan Hou Chaoke Bulin Ruichao Zhao Bangwen Zhang Analytical and Testing Center Inner Mongolia University of Science and TechnologyBaotou014010China School of Materials and Metallurgy Inner Mongolia University of Science and TechnologyBaotou014010China School of Metallurgy and Materials Engineering Chongqing University of Science and TechnologyChongqing401331China

We investigated the effect of additional doping with Ce on the ionic conductivity of the Nb-doped Li_(7)La_(3)Zr_(2)O_(12)(LLZO)garnet ceramics using a combination of experimental and modeling *** results indicate that Ce doping can alter lattice parameters of the LLZNO,leading to the enhanced lithium ionic *** Ce,Nb co-doped LLZO(LLZNCO)structure with composition Li_(6.5)La_(3)Zr_(1.5-x)Nb_(0.5)Ce_(x)O_(12)(x=0.125)exhibits a lower activation energy(E_(a)=0.39 eV)than Li_(6.5)La_(3)Zr_(1.5)Nb_(0.5)O_(12)(LLZNO)(E_(a)=0.41 eV).Furthermore,Ce doping leads to an increase in Li~+conductivity from 6.4×10^(-4)to 7×10^(-4)S/cm at room *** addition,we discuss the diffusivity and conductivity of our samples using ab initio molecular dynamics simulations and propose possible mechanisms to explain the enhanced Li-ion conductivity caused by co-doping with Ce and *** results demonstrate that the LLZNCO ceramics are promising candidates for potential solid-state electrolytes for Li-ion batteries.

关键词： Rare earths Solid state electrolyte ionic conductivity Doping

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ionic conductivity and relaxation studies in PVDF-HFP:PMMA-based gel polymer blend electrolyte with LiClO_(4) salt

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Journal of Advanced Dielectrics 2018年第1期8卷 37-49页

作者： Khushbu Gohel D.K.Kanchan Department of Physics Faculty of Science The M.S.University of Baroda Vadodara 390002GujaratIndia

Poly(vinylidene fluoride-hexafluropropylene)(PVDF-HFP)and poly(methyl methacrylate)(PMMA)-based gel polymer electrolytes(GPEs)comprising propylene carbonate and diethyl carbonate mixed plasticizer with variation of lithium perchlorate(LiClO_(4))salt concentrations have been prepared using a solvent casting *** characterization has been carried out using XRD wherein diffraction pattern reveals the amorphous nature of sample up to 7.5 wt.%salt and complexation of polymers and salt have been studied by FTIR *** morphology of the samples has been studied using scanning electron *** impedance spectroscopy in the temperature range 303-363K has been carried out for electrical *** maximum room temperature conductivity of 2.83×10^(-4) S cm^(-1) has been observed for the GPE incorporating 7.5 wt.%LiClO_(4).The temperature dependence of ionic conductivity obeys the Arrhenius *** increase in ionic conductivity with change in temperatures and salt content is *** number measurement is carried out by Wagner’s DC polarization *** tangent(tanδ)and imaginary part of modulus(M″)corresponding to dielectric relaxation and conductivity relaxation respectively show faster relaxation process with increasing salt content up to optimum value of 7.5 wt.%LiClO_(4).The modulus(M″)shows that the conductivity relaxation is of non-Debye type(broader than Debye peak).

关键词： Gel polymer electrolyte ionic conductivity transport number Wagner’s DC polarization impedance

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Improving ionic conductivity of von-Alpen-type NASICON ceramic electrolytes via magnesium doping

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Journal of Advanced Ceramics 2023年第5期12卷 1058-1066页

作者： Il-Seop Jang Wooseok Go Bo-Ye Song Hayoung Park Yun Chan Kang Jinyoung Chun Emerging Materials R&D Division Korea Institute of Ceramic Engineering and Technology(KICET)Jinju 52851Republic of Korea Department of Materials Science and Engineering Korea UniversitySeoul 02841Republic of Korea Energy Storage and Distribution Resources Division Lawrence Berkeley National LaboratoryBerkeley 94720USA

NASICON (sodium (Na) superionic conductor) compounds have attracted considerable attention as promising solid electrolyte materials for advanced Na-based batteries. In this study, we investigated the improvement in ionic conductivities of von-Alpen-type NASICON (vA-NASICON) ceramic electrolytes by introducing a magnesium ion (Mg^(2+)) as a heterogeneous element. The optimal Mg-doped vA-NASICON exhibited a high ionic conductivity of 3.64×10^(−3) S·cm^(−1), which was almost 80% higher than that of un-doped vA-NASICON. The changes in physicochemical properties of the vA-NASICONs through the Mg introduction were systematically analyzed, and their effects on the ionic conductivities of the vA-NASICON were studied in detail. When the optimal ratio of Mg^(2+) was used in a synthetic process, the relative density (96.6%) and grain boundary ionic conductivity (σgb) were maximized, which improved the total ionic conductivity (σt) of the vA-NASICON. However, when Mg^(2+) was introduced in excess, the ionic conductivity decreased because of the formation of an undesired sodium magnesium phosphate (NaxMgyPO_(4)) secondary phase. The results of this study are expected to be effectively applied in the development of advanced sodium-based solid electrolytes with high ionic conductivities.

关键词： NASICON solid electrolyte von-Alpen-type magnesium(Mg)doping ionic conductivity

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Atomistic mechanism of high ionic conductivity in lithium ytterbium-based halide solid electrolytes:A first-principles study

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Journal of Rare Earths 2024年第1期42卷 155-162,I0006页

作者： Limin Wang Wei Xiao Lu Sun Rong Yang Jinqiu Yu Ligen Wang State Key Laboratory of Nonferrous Metals and Processes China GRINM Group Co.Ltd.Beijing100088China GRIMAT Engineering Institute Co. Ltd.Beijing101407China General Research Institute for Nonferrous Metals Beijing100088China China Automotive Battery Research Institute Co. Ltd.Beijing101407China Rare Earth Functional Materials(Xiong'an)Innovation Center Co. Ltd.Xiong'an071700China

As the next generation of commercial automotive power batteries begins replacing liquid lithium batteries,many look towards all-solid-state batteries to pioneer the ***-so lid-state batteries have attracted the attention of countless researchers around the world because of their high safety and high energy *** recent times,halide solid-state electrolytes have become a research hotspot within solid-state electrolytes because of their potentially superior *** this paper,in the framework of DFT,we investigated the atomic mechanisms of improving the ionic conductivity and stability of Li_(3)YbCl_(6).Our calculations show that both trigonal and orthorhombic Li_(3)YbCl_(6) exhibit wide electrochemical windows and metastable properties(100 meV/atom>Ehull>0 meV/atom).However,the orthorhombic Li_(3)YbCl_(6) can be stabilized at high temperatures by taking the vibrational entropy into account,which is supported by the experimental ***,it is expected that because of the Yb/Li synergistic interactions that,due to their strong mutual coulomb repulsion,influence the Li^(+)transport behavior,the orthorhombic Li_(3)YbCl_(6) might have superior ionic conductivities with appropriate Li+migration paths determined by the Yb^(3+) ***,higher ionic conductivities can be obtained by regulating the random distribution of Li^(+) *** Li^(+)-deficiency can also largely increase the ionic conductivity by invoking *** study helps gain a deeper understanding of the laws that govern ionic conductivities and stabilities and provides a certain theoretical reference for the experimental development and design of halide solid-state electrolytes.

关键词： Halide solid-state electrolytes Phase stability ionic conductivity First-principles calculations Rare earths

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