On the role of the pore morphology on the electrical conductivity of porous yttria-stabilized zirconia

Cordier, Anne; Khal, Hana El; Siebert, Elisabeth; Steil, M.C.

doi:10.1016/j.jeurceramsoc.2019.02.027

Cited by 21 publications

(11 citation statements)

References 29 publications

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“…The high resistivity before FS is due to poor grain‐to‐grain contact 37,39 . The conductivity enhancement is the result of interparticle necks formation during FS even if it remained one order of magnitude below the conductivity obtained for conventionally sintered pellet, due to high residual porosity especially in the centre of the pellet (Zone 2) 40 . These results demonstrate that FS can occur for LCO, a mixed e − /Li + , between classical platinum electrodes, without electrochemical reaction between the electrodes and the material.…”

Section: Resultsmentioning

confidence: 73%

Flash sintering of cationic conductive ceramics: A way to build multilayer systems

et al. 2021

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Flash Sintering (FS), that allows densifying ceramics at low furnace temperature in a few seconds, requires a reversible electrochemical reaction to enable the current flow through the electrode / material interface. For Li + pure ionic conductors such as Li 1.3 Al 0.3 Ti 1.7 (PO 4 ) 3 (LATP), the best material to ensure this fast charge transfer reaction is a mixed Li + /e − conductor, eg, LiCoO 2 (LCO). This paper demonstrates the feasibility of FS on LCO between two Pt electrodes and on multi-layers systems using LCO or LATP+LCO composite as electrodes. It is shown that a composite electrode both allows the flash event to occur and prevents the delamination possibly observed with pure LCO by lowering interfacial stresses.

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Section: Resultsmentioning

confidence: 73%

Flash sintering of cationic conductive ceramics: A way to build multilayer systems

et al. 2021

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“… 28 Experimentally, certain requirements need to be met to allow reliable electrochemical impedance spectroscopy data analysis, for example, low porosity, as pores constrain the current flow during the experiment, resulting in Nyquist plots with large impedances, which do not reflect accurately the material’s properties. 29 To achieve densified pellets, methods including high-temperature sintering, 30 spark plasma sintering, 31 and two-step sintering processes 32 have been studied. These methods, however, can lead to element volatilization, due to localized sample overheating.…”

Section: Results and Discussionmentioning

confidence: 99%

Intrinsic Defects and Their Role in the Phase Transition of Na-Ion Anode Na₂Ti₃O₇

Choi

Costa

Tapia‐Ruiz

et al. 2022

ACS Appl. Energy Mater.

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The development of high-power anode materials for Naion batteries is one of the primary obstacles due to the growing demands for their use in the smart grid. Despite the appealingly low cost and nontoxicity, Na 2 Ti 3 O 7 suffers from low electrical conductivity and poor structural stability, which restricts its use in high-power applications. Viable approaches for overcoming these drawbacks reported to date are aliovalent doping and hydrogenation/hydrothermal treatments, both of which are closely intertwined with native defects. There is still a lack of knowledge, however, of the intrinsic defect chemistry of Na 2 Ti 3 O 7 , which impairs the rational design of high-power titanate anodes. Here, we report hybrid density functional theory calculations of the native defect chemistry of Na 2 Ti 3 O 7 . The defect calculations show that the insulating properties of Na 2 Ti 3 O 7 arise from the Na and O Schottky disorder that act as major charge compensators. Under high-temperature hydrogenation treatment, these Schottky pairs of Na and O vacancies become dominant defects in Na 2 Ti 3 O 7 , triggering the spontaneous partial phase transition to Na 2 Ti 6 O 13 and improving the electrical conductivity of the composite anode. Our findings provide an explanation on the interplay between intrinsic defects, structural phase transitions, and electrical conductivity, which can aid understanding of the properties of composite materials obtained from phase transitions.

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“…The presence of a second phase, even in minor amounts, can be the source of disturbance of impedance arcs. Porous electrolytes are one of the best studied examples, showing that pore size distribution and volume fraction influence the so-called bulk and grain boundary arcs (Roberts and Schwartz, 1985;Kleitz and Steil, 1997;Pérez-Coll et al, 2010;Marrero-López et al, 2014;El Khal et al, 2017;Cordier et al, 2019). For dispersed insulating phases within a conducting phase, the effective medium theory offers proper background for data analysis (Maxwell, 1904;Kleitz and Steil, 1997).…”

Section: Introductionmentioning

confidence: 99%

Role of salts on the electrical performance of ceria-based electrolytes: An overview

Grilo

Jamale²,

Starykevich³

et al. 2022

Front. Mater.

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This work provides an overview on established achievements and debatable findings involving Ca, Gd or Sm-doped ceria-based electrolytes, using Li2CO3, LiNO3 and Na2CO3 as sintering aid or as second phase. The performance of these materials is discussed considering the characteristics of the oxides and of the salts or derived second(ary) phases (e.g., alkali metal oxides and hydroxides, eutectic mixtures), extensively surveyed to identify influential parameters with respect to processing and electrical performance (e.g., melting and boiling points, thermal decomposition, hydrolysis). The analysis of published data highlights the possible contribution of additional charge carriers to the total conductivity, besides oxide-ion vacancies. Claimed bulk and grain boundary conductivity enhancements are deeply discussed, as well as advantages and limitations of impedance spectroscopy as characterization tool. Irrespective of controversial reasons, reports on unusual improvements of grain boundary conductivity sustain the possibility of advanced grain boundary engineering to enhance the performance of these materials.

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On the role of the pore morphology on the electrical conductivity of porous yttria-stabilized zirconia

Cited by 21 publications

References 29 publications

Flash sintering of cationic conductive ceramics: A way to build multilayer systems

Flash sintering of cationic conductive ceramics: A way to build multilayer systems

Intrinsic Defects and Their Role in the Phase Transition of Na-Ion Anode Na₂Ti₃O₇

Role of salts on the electrical performance of ceria-based electrolytes: An overview

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On the role of the pore morphology on the electrical conductivity of porous yttria-stabilized zirconia

Cited by 21 publications

References 29 publications

Flash sintering of cationic conductive ceramics: A way to build multilayer systems

Flash sintering of cationic conductive ceramics: A way to build multilayer systems

Intrinsic Defects and Their Role in the Phase Transition of Na-Ion Anode Na2Ti3O7

Role of salts on the electrical performance of ceria-based electrolytes: An overview

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Intrinsic Defects and Their Role in the Phase Transition of Na-Ion Anode Na₂Ti₃O₇