High conductivity of La2Zr2O7nanofibers by phase control

Ou, Gang; Liu, Wei; Yao, Lei; Wu, Hui; Pan, Wei

doi:10.1039/c3ta13465b

Cited by 43 publications

(36 citation statements)

References 37 publications

(41 reference statements)

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“…The formation of quasi-sphere Li 3 PO 4 could be explained by the difference solubility products of Li 3 PO 4 (K sp1 = 3.2 Â 10 À9 ) and Li 2 HPO 4 (K sp2 = 4.0 Â 10 À1 ). 2b-1-1 24,27,28 With the temperature further increasing to 120 1C (Fig. 1b) shows that the peaks can be only indexed as Li 3 PO 4 , and the intensity of peaks decrease with the adjunction of Fe 2+ and Mn 2+ .…”

Section: Formation and Evolution Of Lmfpmentioning

confidence: 97%

“…1e), all the reflections are indexed as an orthorhombic olivine-type structure (JCPDS No. 28 Fig . The XRD patterns of intermediate sampled at 140 1C (Fig.…”

Section: Formation and Evolution Of Lmfpmentioning

confidence: 99%

“…S2, ESI †) show that the precipitation of (Mn,Fe) 3 28,35 The amount of dissolved ions at a relatively low concentration solution is insufficient, which results in the deficiency of crystal nucleus and the slowness of the crystal growth rate. When the resultant concentration of precursor is decreased to 0.25 mol L À1 while keeping other parameters constant, the formation and transformation of the precursor are hindered.…”

Section: Formation and Evolution Of Lmfpmentioning

confidence: 99%

“…22 Furthermore, Fe doping also dilutes the concentration of Mn. 24,25,27,28 However, the nucleation and crystallization of LiMn 1Àx Fe x PO 4 under hydrothermal condition is rare studied, especially for LiMn 0.5 Fe 0.5 PO 4 (LMFP), which provides the optimal energy density, charge capability and durability for potential practical large-scale applications. 21 Numerous synthetic methods to obtain LiMn 1Àx Fe x PO 4 with improved electrochemical performance have been extensively investigated.…”

Section: Introductionmentioning

confidence: 99%

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Hydrothermal synthesis, evolution, and electrochemical performance of LiMn_0.5Fe_0.5PO₄ nanostructures

Xiang

Zhong

et al. 2015

Phys. Chem. Chem. Phys.

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LiMn0.5Fe0.5PO4 (LMFP) materials are synthesized by the hydrothermal approach in an organic-free and surfactant-free aqueous solution. The phase and morphological evolution of the material intermediates at different reaction temperatures and times are characterized by XRD, SEM and TEM, respectively. The results show that during temperature increase, the solubility product (Ksp) of the precursors (Li3PO4, Fe3(PO4)2 and (Mn,Fe)3(PO4)2) is the decisive parameter for the precipitation processes. Once the temperature locates at the range of 100-110 °C, the unstable precursors dissolve quickly and then LMFP nuclei are formed, followed by a dissolution-reprecipitation process. As the reaction progresses, the primary particles self-aggregate to form rod or plate particles to reduce the overall surface energy through oriented attachment (OA) and the Ostwald ripening (OR) mechanism. Moreover, the resultant concentration of the precursor significantly affects the crystal size of LMFP by altering the supersaturation degree of solution at the nucleation stage. The carbon coated LMFP nanostructure synthesized at 0.6 mol L(-1) (resultant concentration of PO4(3-)) delivers discharge capacities of 155, 100 and 81 mA h g(-1) at 0.1, 5 and 20 C rate, respectively. The understanding of nanostructural evolution and its influence on the electrochemical performance will pave a way for a high-performance LMFP cathode.

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Section: Formation and Evolution Of Lmfpmentioning

confidence: 97%

“…1e), all the reflections are indexed as an orthorhombic olivine-type structure (JCPDS No. 28 Fig . The XRD patterns of intermediate sampled at 140 1C (Fig.…”

Section: Formation and Evolution Of Lmfpmentioning

confidence: 99%

Section: Formation and Evolution Of Lmfpmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Hydrothermal synthesis, evolution, and electrochemical performance of LiMn_0.5Fe_0.5PO₄ nanostructures

Xiang

Zhong

et al. 2015

Phys. Chem. Chem. Phys.

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“…[8][9][10][11][12][13][14][15][16] It has been found that the oxygen ionic conductivity of solid electrolyte can be improved by engineering the multilayered thin film heterostructures. [8][9][10][11][12][13][14][15][16] It has been found that the oxygen ionic conductivity of solid electrolyte can be improved by engineering the multilayered thin film heterostructures.…”

Section: Nanofibers Whichmentioning

confidence: 99%

Fabrication of high performance oxygen sensors using multilayer oxides with high interfacial conductivity

Yao

Liu

et al. 2016

J. Mater. Chem. A

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The effective enhancement of ionic conductivity for solid oxide electrolytes by manipulating the multilayered hetero-nanostructures has been recognized for more than a decade; however, such fantastic nanostructure has not been applied for practical application yet. Here we fabricated Ce 0.8 Sm 0.1 Nd 0.1 O 2-δ /Al 2 O 3 (SNDC/AO) multilayered electrolyte materials with high oxygen ionic conductivity and explored their applications in oxygen sensors with low operating temperature. The multilayer oxides electrolyte shows a conductivity of 2 orders of magnitude higher than that of traditional yittria-stabilized zirconia (YSZ) ceramics at 400 °C, which endows the sensors with high 2 performances including rapid response (~0.1 s), high sensibility (down to 1 vol.%) and high cycling stability (no performance degradation after 1000 cycles), and most importantly, low operating temperature (200 °C lower relative to the YSZ-based sensors). The excellent performances of our multilayered electrolytes can be attributed to their high interfacial conductivity and low activation energy which might be related to the structurally highly disordered microstructures. This study shows good prospects for the efficient and practical use of multilayered oxide based electrolytes for a range of applications including sensors, oxygen separation, solid oxide fuel cells (SOFCs) and solid oxide electrolysis cells (SOECs). IntroductionOxygen sensors, which can effectively detect oxygen concentration, have been widely used to control the fuels combustion process for applications such as vehicles, aerospace and thermal power generation. 1-4 Effective fuels combustion based on the conventional high-temperature oxygen sensors plays significant roles in increasing energy efficiency and reducing pollutant emission. 5,6 However, to effectively operate sensors at low temperatures such as during the start-up of the cold engines still remains a great challenge. Previous studies showed that miniaturized sensors possess lower operating temperature and excellent performances compared with their macro counterparts. 2,4,7 For example, The sandwich-like microbar structure which consists of two multilayered electrolytes bonded face-to-face without removing substrates is designed to enable an easy alignment of heterointerfaces.The generated fast ion transport pathways, i.e. the heterointerfaces, lead to high ionic conductivity in the current direction of the sensors and thus can reduce the operation temperature. This strategy can successfully overcome the aforementioned key challenge for the practical application of multilayered 13 can be transformed into digital signals of '0' and '1', respectively. Furthermore, it can act as a switch to control the combustion processes in practical applications, including internal combustion engines, industrial boilers and metallurgical heat-treatment furnaces. ConclusionsIn conclusion, we successfully fabricated multilayered solid electrolyte with a unique microbar structure which is facile to be integrated into a micro oxyge...

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Glass‐Type Polyamorphism in Li‐Garnet Thin Film Solid State Battery Conductors

Garbayo

Struzik

Bowman

et al. 2018

Advanced Energy Materials

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Ceramic Li7La3Zr2O12 garnet materials are promising candidates for the electrolytes in solid state batteries due to their high conductivity and structural stability. In this paper, the existence of “polyamorphism” leading to various glass‐type phases for Li‐garnet structure besides the known crystalline ceramic ones is demonstrated. A maximum in Li‐conductivity exists depending on a frozen thermodynamic glass state, as exemplified for thin film processing, for which the local near range order and bonding unit arrangement differ. Through processing temperature change, the crystallization and evolution through various amorphous and biphasic amorphous/crystalline phase states can be followed for constant Li‐total concentration up to fully crystalline nanostructures. These findings reveal that glass‐type thin film Li‐garnet conductors exist for which polyamorphism can be used to tune the Li‐conductivity being potential new solid state electrolyte phases to avoid Li‐dendrite formation (no grain boundaries) for future microbatteries and large‐scale solid state batteries.

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High conductivity of La₂Zr₂O₇nanofibers by phase control

Cited by 43 publications

References 37 publications

Hydrothermal synthesis, evolution, and electrochemical performance of LiMn_0.5Fe_0.5PO₄ nanostructures

Hydrothermal synthesis, evolution, and electrochemical performance of LiMn_0.5Fe_0.5PO₄ nanostructures

Fabrication of high performance oxygen sensors using multilayer oxides with high interfacial conductivity

Glass‐Type Polyamorphism in Li‐Garnet Thin Film Solid State Battery Conductors

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High conductivity of La2Zr2O7nanofibers by phase control

Cited by 43 publications

References 37 publications

Hydrothermal synthesis, evolution, and electrochemical performance of LiMn0.5Fe0.5PO4 nanostructures

Hydrothermal synthesis, evolution, and electrochemical performance of LiMn0.5Fe0.5PO4 nanostructures

Fabrication of high performance oxygen sensors using multilayer oxides with high interfacial conductivity

Glass‐Type Polyamorphism in Li‐Garnet Thin Film Solid State Battery Conductors

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Product

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High conductivity of La₂Zr₂O₇nanofibers by phase control

Hydrothermal synthesis, evolution, and electrochemical performance of LiMn_0.5Fe_0.5PO₄ nanostructures

Hydrothermal synthesis, evolution, and electrochemical performance of LiMn_0.5Fe_0.5PO₄ nanostructures