Microstructure and ionic conductivity of LLTO thin films: Influence of different substrates and excess lithium in the target

Aguesse, Frédéric; Roddatis, Vladimir; Roqueta, Jaume; García, Pablo; Pergolesi, Daniele; Santiso, J.; Kilner, John A.

doi:10.1016/j.ssi.2014.12.005

Cited by 40 publications

(41 citation statements)

References 21 publications

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“…These films showed a conductivity σ i of 3.5 × 10 −5 S·cm −1 at 25 • C with E a = 0.35 eV (Figure 14). The influence of different substrates and excess lithium in the target on the microstructure and ionic conductivity of PLD LLTO thin films was examined by Aguesse et al [273] Despite a large lattice mismatch of up to +8.8% with the substrate, the epitaxial growth of LLTO is possible on different (001) oriented LaAlO3, SrTiO3, and MgO substrates using a sintered Li0.37La0.54TiO3 target and PLD parameters, such as Ts = 750-880 °C, PO₂ = 4-20 Pa, and laser fluence of 1.07 J cm −2 . An ionic conductivity as high as 19.2 × 10 −3 mS·cm −1 at 25 °C was obtained for 170-nm thick LLTO films grown on an STO substrate from an ablated 10 mol% lithium excess target.…”

Section: X La 2/3+y Tio 3−d (Llto)mentioning

confidence: 99%

Pulsed Laser Deposited Films for Microbatteries

Julien

Mauger

2019

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This review article presents a survey of the literature on pulsed laser deposited thin film materials used in devices for energy storage and conversion, i.e., lithium microbatteries, supercapacitors, and electrochromic displays. Three classes of materials are considered: Positive electrode materials (cathodes), solid electrolytes, and negative electrode materials (anodes). The growth conditions and electrochemical properties are presented for each material and state-of-the-art of lithium microbatteries are also reported.

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Section: X La 2/3+y Tio 3−d (Llto)mentioning

confidence: 99%

Pulsed Laser Deposited Films for Microbatteries

Julien

Mauger

2019

Coatings

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“…Close investigations of the microstructure of polycrystalline sinters of LLTO revealed that besides grain boundaries, also high-angle domain boundaries present within crystallites exhibit reduced concentration of lithium [19][20][21][22]. Both features, 2D ionic transport and complex microstructure contribute to particularly low apparent grain boundary ionic conductivity (r gb,ap ), about 10 -7 -10 -6 S cm -1 [23][24][25][26] at RT, which is several orders of magnitude lower than the bulk ionic conductivity. It should be noticed, however, that there is a fundamental difference between the apparent and the specific conductivity of the grain boundaries (r gb ).…”

Section: Graphic Abstract Introductionmentioning

confidence: 96%

Mitigation of grain boundary resistance in La2/3-xLi3xTiO3 perovskite as an electrolyte for solid-state Li-ion batteries

et al. 2020

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In this work, we report that modification of the chemical composition of grain boundaries of La2/3-xLi3xTiO3 double perovskite, one of the most promising Li-ion conducting solid electrolytes, can be a convenient and versatile way of controlling the space charge potential, leading to a mitigated electrical resistance of the grain boundaries. Two groups of additives are investigated: lithium-enriching agents (Li3BO3, LiF) and 3d metal ions (Co2+, Cu2+), both expected to reduce the Schottky barrier. It is observed that Li-containing additives work effectively at a higher sintering temperature of 1250 °C. Regarding copper, it shows a much stronger positive impact at lower temperature, 1150 °C, while the addition of cobalt is always detrimental. Despite overall complex behavior, it is documented that the decreased space charge potential plays a more important role in the improvement of lithium conduction than the thickness of the grain boundaries. Among the proposed additives, modification of La2/3-xLi3xTiO3 by 2 mol.% Cu2+ results in the space charge potential reduction by 32 mV in relation to the reference sample, and the grain boundary specific conductivity increase by 80%, as measured at 30 °C. Introduced additive allows to obtain a similar effect on the conductivity as elevating the sintering temperature, which can facilitate manufacturing procedure. Graphic abstract

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“…The ordering of the A‐site cations to form La rich and La poor planes stabilizes the highly conductive tetragonal symmetry instead of a cubic symmetry [122] . The stabilization of the tetragonal phase in thin films was indeed reported at high temperature depositions [18,34,123] . Lithium ion conductivity in crystalline LLTO is mainly determined by lithium content and A‐site vacancy concentration, and the highest conductivity is obtained for the composition Li 0.33 La 0.56 TiO 3 [120] …”

Section: Electrolyte Materialsmentioning

confidence: 83%

“…Aguesse et al [18] . reported crystalline samples deposited on SrTiO 3 (STO) and LaAlO 3 (LAO) starting from 850 °C.…”

Section: Electrolyte Materialsmentioning

confidence: 99%

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Pulsed Laser Deposition as a Tool for the Development of All Solid‐State Microbatteries

Indrizzi

Ohannessian

Pergolesi

et al. 2021

Helvetica Chimica Acta

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All‐solid‐state lithium ion batteries (LIB) are currently the most promising technology for next generation electrochemical energy storage. Many efforts have been devoted in the past years to improve performance and safety of these devices. Nevertheless, issues regarding chemical and mechanical stability of the different components still hinder substantial improvements. Pulsed laser deposition (PLD) has proved to be an outstanding technique for the deposition of thin films of materials of interest for the fabrication of LIB. Thanks to its versatility and possible fine tuning of the thin film properties, PLD promises to be a very powerful tool for the fabrication of model systems which would allow to study in detail material properties and mechanisms contributing to LIB degradation. Nevertheless, PLD presents difficulties in the deposition of LIB components, mainly due to the presence of elements with large difference of atomic mass in their chemical composition. In this review, we report the main challenges and solution strategies used for the deposition through PLD of complex oxides thin films for LIB.

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Microstructure and ionic conductivity of LLTO thin films: Influence of different substrates and excess lithium in the target

Cited by 40 publications

References 21 publications

Pulsed Laser Deposited Films for Microbatteries

Pulsed Laser Deposited Films for Microbatteries

Mitigation of grain boundary resistance in La2/3-xLi3xTiO3 perovskite as an electrolyte for solid-state Li-ion batteries

Pulsed Laser Deposition as a Tool for the Development of All Solid‐State Microbatteries

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