Microwave Processing for Improved Ionic Conductivity in Li2O–Al2O3–TiO2–P2O5 Glass‐Ceramics

Davis, Calvin; Nino, Juan C.

doi:10.1111/jace.13638

Cited by 33 publications

(12 citation statements)

References 17 publications

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“…In solid-based approaches, Davis and Nino [65] demonstrated that LATP synthesized through aM W-assisted method had an ionic conductivity of 5.33 10 À4 Scm À1 ,w hich was5 times higher than that of LATP obtained through conventional heat treatment. They attributed the Li-ion conductivity enhancement to differences in the microstructure, specifically the larger grain size and lower grain boundary resistance.…”

Section: Sinteringp Arametersmentioning

confidence: 99%

“…To reducel ithium loss during the heat-treatmentp rocess for LATP and LAGP solid electrolyte synthesis, rapid sintering techniques have been developed:S PS, [60][61][62] FAST, [63] and MW-assisted sintering (Figure1c-e). [64,65] In principle, the SPS technique utilizes electrical currents to aid densification in ad ie with resistive heating at highr ates (> 100 8Cmin À1 ). [66,67] FAST applies av oltage exclusively to the sample during sintering to increase the resistivity of the material and then achieveasimilare ffect to that of solid-state sintering.…”

Section: Fast Sintering Techniquesmentioning

confidence: 99%

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Synthesis and Properties of NaSICON‐type LATP and LAGP Solid Electrolytes

2019

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Inorganic solid electrolytes, in comparison with their liquid counterparts, have more potential in varioust ypes of batteries due to their dual roles of ion transportation and separation. For all-solid-state batteries, solide lectrolytes bring several advantages, [1][2][3][4][5][6] such as enhanced safety,i ncreased energy density,s olid device integration, and packaging;t hese expand the operation temperature range and potentially improve cycling stabilitya nd lifetime. Moreover,i norganic solid electrolytes are also beneficial for lithium-ion batteries and lithium-air batteries, in which they functiona se ither surface modification layers or lithium-ion conductors. [7,8] In principle, ideal solid electrolytes are expected to have several features: [9][10][11][12][13][14] 1) fast ion dynamics and negligible electronic conductivity (minimum ionic conductivity of 10 À4 Scm À1 at room temperature for practical consideration);2 )a wide electrochemical potential window for battery cycling;3 )ane xceptional mechanical strength to suppress lithium dendrite growth;4 )excellent thermal stability during the cycling processes;and 5) asimple and low cost synthetic process for large-scale applications.Generally,i norganic lithium superionic conductors are divided into three categories:o xides, sulfides, and phosphates. Suc-cessfule xamples in oxidesi nclude garnet oxides, [15,16] perovskite-type oxides, [17,18] and antiperovskite oxides. [19][20][21] Sulfide solid electrolytes include Li 2 SÀP 2 S 5 , [22,23] Li 3 PS 4 , [24][25][26] Li 7 P 3 S 11 , [27,28] Li 7 PS 6 ,a nd Li 6 PS 5 X( X = Cl, Br). [29][30][31] Popular phosphate solid electrolytes include sodium superionic conductor (NaSICON)structured lithium-ion conductors, [32][33][34][35][36] such as LiTi 2 (PO 4 ) 3 (LTP), Li 1 + x Al x Ti 2Àx (PO 4 ) 3 (LATP), and Li 1 + x Al x Ge 2Àx (PO 4 ) 3 (LAGP). Many exciting discoveries of these materials have been summarized in important review papers. [2,6,[37][38][39][40] NaSICON-type solid electrolytes, such as LATP and LAGP, have marked advantages compared with sulfides and oxides: they display chemicals tabilityi na ir and/or water,a re low cost and low toxicity,a nd have great electrochemical stability with the added benefito fe asy preparation. [2,36,38] They also exhibit attractive ionic conductivities of 10 À4 -10 À3 Scm À1 at room temperature. Such features have recently caused renewed interest in these NaSICON-structured materials and much effort has been devoted to the investigation of this type of solid electrolyte, especiallyL ATPa nd LAGP.T his manuscript reviewsr ecent progress in LATP and LAGP solid electrolytes, with as pecific focus on synthetic approaches and their effects on the crystal structures, conductive properties, and applications. Herein, general synthetic methods for LATP and LAGP solid electrolytes are first introduced, followed by ac omparison of the crystal structures, phase purities, and ionic conductivities that result from different approaches. Later,t he applications of LATP and LAGP in ful...

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Section: Sinteringp Arametersmentioning

confidence: 99%

Section: Fast Sintering Techniquesmentioning

confidence: 99%

Synthesis and Properties of NaSICON‐type LATP and LAGP Solid Electrolytes

2019

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“…The atomic ratio of Y, Zr, P, and O is summarized in Table S1 in the Supporting Information, and based on the ratio, the x value in Li 1+ x Y x Zr 2− x (PO 4 ) 3 is estimated to be x ≈0.11. The conductivity of the membrane was estimated by fitting the electrochemical impedance spectrum (Figure c) with an equivalent circuit shown in Figure S4 in the Supporting Information according to a recent relevant study of the solid state electrolyte . At 25 °C, the optimized conductivity of the LYZP membrane was ≈2.5 × 10 −5 S cm −1 .…”

Section: Resultsmentioning

confidence: 99%

“…Since Li is not detectable with the EDS, the map ping of Li is not provided in Figure S2 in the Supporting Infor mation. [9] At 25 °C, the optimized conductivity of the LYZP membrane was ≈2.5 × 10 −5 S cm −1 . The atomic ratio of Y, Zr, P, and O is summarized in Table S1 in the Supporting Informa tion, and based on the ratio, the x value in Li 1+x Y x Zr 2−x (PO 4 ) 3 is estimated to be x ≈0.11.…”

Section: Characteristics and Properties Of The Lyzp Solid-electrolytementioning

confidence: 96%

Polysulfide‐Shuttle Control in Lithium‐Sulfur Batteries with a Chemically/Electrochemically Compatible NaSICON‐Type Solid Electrolyte

Bi²,

Zhao³

et al. 2016

Advanced Energy Materials

124

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A NaSICON‐type Li+‐ion conductive membrane with a formula of Li1+ x Y x Zr2− x (PO4)3 (LYZP) (x = 0–0.15) has been explored as a solid‐electrolyte/separator to suppress polysulfide‐crossover in lithium‐sulfur (Li‐S) batteries. The LYZP membrane with a reasonable Li+‐ion conductivity shows both favorable chemical compatibility with the lithium polysulfide species and exhibits good electrochemical stability under the operating conditions of the Li‐S batteries. Through an integration of the LYZP solid electrolyte with the liquid electrolyte, the hybrid Li‐S batteries show greatly enhanced cyclability in contrast to the conventional Li‐S batteries with the porous polymer (e.g., Celgard) separator. At a rate of C/5, the hybrid Li ||LYZP|| Li2S6 batteries developed in this study (with a Li‐metal anode, a liquid/LYZP hybrid electrolyte, and a dissolved lithium polysulfide cathode) delivers an initial discharge capacity of ≈1000 mA h g−1 (based on the active sulfur material) and retains ≈90% of the initial capacity after 150 cycles with a low capacity fade‐rate of <0.07% per cycle.

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“…The following supporting information can be downloaded at: , Table S1: Comparison of ionic conductivities and activation energies of various solid electrolytes. References [ 34 , 35 , 36 , 37 , 38 , 39 , 40 ] are cited in the Supplementary Materials.…”

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confidence: 99%

Synthesis of Superionic Conductive Li1+x+yAlxSiyTi2−xP3−yO12 Solid Electrolytes

Jeong

Baek

et al. 2022

Nanomaterials

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Commercial lithium-ion batteries using liquid electrolytes are still a safety hazard due to their poor chemical stability and other severe problems, such as electrolyte leakage and low thermal stability. To mitigate these critical issues, solid electrolytes are introduced. However, solid electrolytes have low ionic conductivity and inferior power density. This study reports the optimization of the synthesis of sodium superionic conductor-type Li1.5Al0.3Si0.2Ti1.7P2.8O12 (LASTP) solid electrolyte. The as-prepared powder was calcined at 650 °C, 700 °C, 750 °C, and 800 °C to optimize the synthesis conditions and yield high-quality LASTP powders. Later, LASTP was sintered at 950 °C, 1000 °C, 1050 °C, and 1100 °C to study the dependence of the relative density and ionic conductivity on the sintering temperature. Morphological changes were analyzed using field-emission scanning electron microscopy (FE-SEM), and structural changes were characterized using X-ray diffraction (XRD). Further, the ionic conductivity was measured using electrochemical impedance spectroscopy (EIS). Sintering at 1050 °C resulted in a high relative density and the highest ionic conductivity (9.455 × 10−4 S cm−1). These findings corroborate with the activation energies that are calculated using the Arrhenius plot. Therefore, the as-synthesized superionic LASTP solid electrolytes can be used to design high-performance and safe all-solid-state batteries.

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Microwave Processing for Improved Ionic Conductivity in Li₂O–Al₂O₃–TiO₂–P₂O₅ Glass‐Ceramics

Cited by 33 publications

References 17 publications

Synthesis and Properties of NaSICON‐type LATP and LAGP Solid Electrolytes

Synthesis and Properties of NaSICON‐type LATP and LAGP Solid Electrolytes

Polysulfide‐Shuttle Control in Lithium‐Sulfur Batteries with a Chemically/Electrochemically Compatible NaSICON‐Type Solid Electrolyte

Synthesis of Superionic Conductive Li1+x+yAlxSiyTi2−xP3−yO12 Solid Electrolytes

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