The Experts below are selected from a list of 309 Experts worldwide ranked by ideXlab platform
P. Padma Kumar - One of the best experts on this subject based on the ideXlab platform.
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influence of cationic ordering on ion transport in NASICONs molecular dynamics study
Solid State Ionics, 2013Co-Authors: P. Padma KumarAbstract:Abstract Molecular dynamics investigations suggest the significance of Si/P ordering on the nature of ion transport in NASICONs (acronym for Na-superionic conductor). For certain Si/P ordering predominantly two dimensional transport of Na + ions in Na 2 Zr 2 SiP 2 O 12 is predicted, which is otherwise known to be an isotropic ionic conductor. The microscopic energetic barriers and topology of the conduction channels are analyzed.
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Influence of Cationic ordering on ion transport in NASICONs: Molecular dynamics study
Solid State Ionics, 2013Co-Authors: Supriya Roy, P. Padma KumarAbstract:Molecular dynamics investigations suggest the significance of Si/P ordering on the nature of ion transport in NASICONs (acronym for Na-superionic conductor). For certain Si/P ordering predominantly two dimensional transport of Na+ions in Na2Zr2SiP2O12is predicted, which is otherwise known to be an isotropic ionic conductor. The microscopic energetic barriers and topology of the conduction channels are analyzed. © 2013 Elsevier B.V.
Arnaud Demortiere - One of the best experts on this subject based on the ideXlab platform.
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Oxidative decomposition products of synthetic NaFePO4 marićite: nano-textural and electrochemical characterization
European Journal of Mineralogy, 2019Co-Authors: Fabrice Brunet, Sorina Cretu, Matthieu Courty, Arnaud Demortiere, Rénald David, Camille Crouzet, Nadir RechamAbstract:44 Single-phase maricite, NaFePO4, was synthesized from monosodium phosphate and 45 iron oxalate at 750°C, at atmospheric pressure. Thermal treatment of synthetic maricite in air 46 indicated oxidative decomposition into Na3Fe 3+ 2(PO4)3 nasicon and-Fe2O3 at temperatures 47 above 225°C. Intergrowth of the reaction products is found to occur at the nanoscale without 48 identified crystallographic relationship with the maricite precursor. Electrochemical activity of 49 the reaction product is confirmed with the reversible insertion of one Na at 2.55 V vs Na + /Na 0. 50 Keywords: sodium iron phosphate; maricite; sodium-ion batteries; oxidative decomposition; 51 NASICON 52 53 54
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oxidative decomposition products of synthetic nafepo4 maricite nano textural and electrochemical characterization
European Journal of Mineralogy, 2019Co-Authors: Fabrice Brunet, Sorina Cretu, Matthieu Courty, Arnaud Demortiere, Rénald David, Camille CrouzetAbstract:44 Single-phase maricite, NaFePO4, was synthesized from monosodium phosphate and 45 iron oxalate at 750°C, at atmospheric pressure. Thermal treatment of synthetic maricite in air 46 indicated oxidative decomposition into Na3Fe 3+ 2(PO4)3 nasicon and-Fe2O3 at temperatures 47 above 225°C. Intergrowth of the reaction products is found to occur at the nanoscale without 48 identified crystallographic relationship with the maricite precursor. Electrochemical activity of 49 the reaction product is confirmed with the reversible insertion of one Na at 2.55 V vs Na + /Na 0. 50 Keywords: sodium iron phosphate; maricite; sodium-ion batteries; oxidative decomposition; 51 NASICON 52 53 54
Nobuhito Imanaka - One of the best experts on this subject based on the ideXlab platform.
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highly conducting divalent mg2 cation solid electrolytes with well ordered three dimensional network structure
Journal of Solid State Chemistry, 2016Co-Authors: Shinji Tamura, Megumi Yamane, Yasunori Hoshino, Nobuhito ImanakaAbstract:Abstract A three-dimensionally well-ordered NASICON-type Mg 2+ cation conductor, (Mg x Hf 1− x ) 4/(4−2 x ) Nb(PO 4 ) 3 , was firstly developed by partial substitution of lower valent Mg 2+ cation onto the Hf 4+ sites in a HfNb(PO 4 ) 3 solid to realize high Mg 2+ cation conductivity even at moderate temperatures. Due to the formation of well-ordered NASICON-type structure, both the high Mg 2+ cation conductivity below 450 °C and the low activation energy for Mg 2+ cation migration was successfully realized for the (Mg 0.1 Hf 0.9 ) 4/3.8 Nb(PO 4 ) 3 solid. Pure Mg 2+ cation conduction in the NASICON-type (Mg 0.1 Hf 0.9 ) 4/3.8 Nb(PO 4 ) 3 solid was directly and quantitatively demonstrated by means of two kinds of dc electrolysis.
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High Ag + Ion Conduction in NASICON-Type Solids
Electrochemical and Solid State Letters, 2010Co-Authors: Shinji Tamura, Takatoshi Highchi, Nobuhito ImanakaAbstract:An Ag 2.6 Sc 1.8 Nb 0.2 (PO 4 ) 3 solid, highly conductive to Ag + ions and with a three-dimensional Na + superionic conductor Na 1+x Zr 2 P 3-x Si x O 12 (NASICON)-type structure, was developed by introducing pentavalent Nb 5+ ions into NASICON-type AgSc(PO 4 ) 3 . Because Nb 5+ ion doping of the NASICON-type solid reduced the interaction between Ag + and the surrounding O 2- ions, the highest Ag + ion conductivity among the NASICON-type Ag + ion conducting solids was obtained.
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Optimization of Sc3+ Ion Conduction in NASICON Type Solid Electrolytes
Chemistry Letters, 2001Co-Authors: Shinji Tamura, Nobuhito Imanaka, Gin-ya AdachiAbstract:Various types of trivalent Sc3+ cation conducting solid electrolytes of the (Sc1−xAlx)1/3Zr2(PO4)3 (0≤x≤0.6), the Sc1/3(Zr1−yHfy)2(PO4)3 (0≤y≤1) and the (Sc0.8Y0.2)1/3Zr2(PO4)3 solid solutions were prepared and the Sc3+ ion conducting properties were compared. The optimum Sc3+ ion conductivity in NASICON type solid electrolytes was successfully obtained for the (Sc0.8Al0.2)1/3Zr2(PO4)3 and the Sc1/3(Zr0.8Hf0.2)2(PO4)3 solids, holding almost the equivalent NASICON crystal lattice size, and the optimization of the Sc3+ ion conduction in NASICON structure was realized.
Yan Yu - One of the best experts on this subject based on the ideXlab platform.
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Challenges and Perspectives for NASICON-Type Electrode Materials for Advanced Sodium-Ion Batteries
Advanced Materials, 2017Co-Authors: Shuangqiang Chen, Changbao Zhu, Yuanye Huang, Laifa Shen, Joachim Maier, Kai Xi, Chao Wu, Yan YuAbstract:Sodium-ion batteries (SIBs) have attracted increasing attention in the past decades, because of high overall abundance of precursors, their even geographical distribution, and low cost. Apart from inherent thermodynamic disadvantages, SIBs have to overcome multiple kinetic problems, such as fast capacity decay, low rate capacities and low Coulombic efficiencies. A special case is sodium super ion conductor (NASICON)-based electrode materials as they exhibit - besides pronounced structural stability - exceptionally high ion conductivity, rendering them most promising for sodium storage. Owing to the limiting, comparatively low electronic conductivity, nano-structuring is a prerequisite for achieving satisfactory rate-capability. In this review, we analyze advantages and disadvantages of NASICON-type electrode materials and highlight electrode structure design principles for obtaining the desired electrochemical performance. Moreover, we give an overview of recent approaches to enhance electrical conductivity and structural stability of cathode and anode materials based on NASICON structure. We believe that this review provides a pertinent insight into relevant design principles and inspires further research in this respect.
Mauro Pasta - One of the best experts on this subject based on the ideXlab platform.
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A New Solid-State Sodium-Metal Battery
Chem, 2018Co-Authors: Samuel Wheeler, Kevin Hurlbutt, Mauro PastaAbstract:Sodium batteries and solid-state electrolytes are two research directions in the effort to develop electrochemical energy storage that goes beyond the lithium ion. In this issue of Chem, Goodenough and colleagues combine a sodium-metal anode, a NASICON solid electrolyte, and a Prussian blue analog cathode to create an energy-dense, long-lived battery. Sodium batteries and solid-state electrolytes are two research directions in the effort to develop electrochemical energy storage that goes beyond the lithium ion. In this issue of Chem, Goodenough and colleagues combine a sodium-metal anode, a NASICON solid electrolyte, and a Prussian blue analog cathode to create an energy-dense, long-lived battery.
