A Fundamental Stability Study for Amorphous LiLaTiO<sub>3</sub>Solid Electrolyte

Zheng, Zhangfeng; Fang, Hua; Liu, Zhe; Wang, Yan

doi:10.1149/2.0011503jes

Cited by 55 publications

(34 citation statements)

References 35 publications

(41 reference statements)

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“…However, the deviation of lithium from this formula could be obtained . Depending on the y value, a series of derived crystal structures of the perovskite could be prepared . However, it is reported that Li x La 0.5 TiO 3 could maintain the same crystal structure in the range 0.37< x <0.595, and the x value in this work is within this range.…”

Section: Resultsmentioning

confidence: 74%

“…Perovskite is a general term for a structural family of CaTiO 3 , which has a general formula of ABO 3 with alkaline rare or earth metal ions in A sites and transition‐metal ions in B sites . A series of Li 3 y La 2/3− y TiO 3 has been synthesized with Li and La occupying the A positions, which exhibited a Li ion conductivity exceeding 10 −3 S cm −1 at room temperature (RT) . The high ion conductivity of perovskite Li 3 y La 2/3− y TiO 3 has aroused the strong interest of researchers .…”

Section: Introductionmentioning

confidence: 99%

“…9,10 A series of Li 3y La 2/3Ày TiO 3 has been synthesized with Li and La occupying the A positions, which exhibited a Li ion conductivity exceeding 10 À3 S cm À1 at room temperature (RT). 11,12 The high ion conductivity of perovskite Li 3y La 2/3Ày TiO 3 has aroused the strong interest of researchers. [13][14][15] The y value in Li 3y La 2/3-y TiO 3 is proposed in the range 0.06<y<0.14.…”

Section: Introductionmentioning

confidence: 99%

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Preparation and properties of Li_xLa_0.5TiO₃ perovskite oxide electrolytes

Qiang

Huang

2017

J Am Ceram Soc

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Solid electrolytes with high lithium ionic conductivity and outstanding mechanical stability are essential for all solid‐state lithium ion batteries. Perovskite LixLa0.5TiO3 is one of the most promising as solid electrolytes candidates. LixLa0.5TiO3 with various initial Li2O (0.5≤x≤0.569) is synthesized by traditional solid‐state reaction at high temperatures. The crystal structure is not remarkably affected by the Li2O quantity, yet higher porosity is obtained as a result of excess Li2O. The Young's modulus, hardness, and fracture toughness are evaluated with indentation method. The Young's modulus increases from 72 to 148 GPa with increasing Li2O, which means that a small variation of Li quantity in LixLa0.5TiO3 results in over a 100% change in Young's modulus. However, the fracture toughness exhibits an opposite trend with that of the Young's modulus. The high Young's modulus and fracture toughness could guarantee the structural integrity during cycle operations.

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Section: Resultsmentioning

confidence: 74%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Preparation and properties of Li_xLa_0.5TiO₃ perovskite oxide electrolytes

Qiang

Huang

2017

J Am Ceram Soc

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“…Amorphous LLTO is compatible with lithium metal, which makes lithium as anode possible. 9 Although Ti 4+ to Ti 3+ reduction still accompanies lithium insertion into amorphous LLTO, its local atomic disorder is considered to localize the electronic states. Amorphous LLTO thin lm prepared by pulsed laser deposition (PLD) exhibits higher ionic conductivity (8.94 Â 10 À4 S cm À1 ) than the crystalline counterpart.…”

Section: Introductionmentioning

confidence: 99%

Sol–gel-processed amorphous inorganic lithium ion electrolyte thin films: sol chemistry

et al. 2017

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Amorphous lithium lanthanum titanium oxide (LLTO) is a promising inorganic solid electrolyte for all-solidstate lithium ion batteries. Preparation of amorphous LLTO using a sol-gel process has been reported. Sol chemistry is vital. In this study, two different sol synthetic strategies, all-alkoxide and acetate-alkoxide routes, were employed to prepare amorphous LLTO thin films. XRD and TEM results show that thin films derived from these two routes are amorphous. SEM results indicate that these thin films are dense and crack-free, but there are differences in their surface morphology. The ionic transport properties of the thin films were measured. The ionic conductivity of the thin film from the all-alkoxide route is almost two orders higher than that from the acetate-alkoxide route. This striking difference results from different sol chemistries. The value 0.36 eV was determined as the activation energy of lithium ion conduction in the thin film from the all-alkoxide route in the temperature range 30-90 C.rsc.li/rsc-advances 30160 | RSC Adv., 2017, 7, 30160-30165This journal is

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“…19 Zheng et al also demonstrated that amorphous LLTO powders by sol-gel synthesis remain ionically conductive in contact with lithium metal even though it undergoes the same lithium insertion and Ti 4+ to Ti 3+ reduction. 8 They hypothesize that this phenomenon is due to local atomic disorder in the amorphous case that localize electronic states.Lastly, amorphous LLTO thin films have a large voltage stability window, which opens a pathway for high-voltage cathode materials, such as LiNi 0.5 Mn 1.5 O 4 (LNMO) spinel. High-voltage cathodes have the potential to greatly improve the energy density of lithium ion batteries, but current liquid electrolytes face stability issues at high voltage due to strong oxidation reactions.…”

mentioning

confidence: 99%

Amorphous Lithium Lanthanum Titanate for Solid-State Microbatteries

Lee

Wang

Xin

et al. 2016

J. Electrochem. Soc.

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Lithium lanthanum titanate (LLTO) is a promising solid state electrolyte for solid state batteries due to its demonstrated high bulk ionic conductivity. However, crystalline LLTO has a relatively low grain boundary conductivity, limiting the overall material conductivity. In this work, we investigate amorphous LLTO (a-LLTO) thin films grown by pulsed laser deposition (PLD). By controlling the background pressure and temperature we are able to optimize the ionic conductivity to 3 × 10 −4 S/cm and electronic conductivity to 5 × 10 −11 S/cm. XRD, TEM, and STEM/EELS analysis confirm that the films are amorphous and indicate that oxygen background gas is necessary during the PLD process to decrease the oxygen vacancy concentration, decreasing the electrical conductivity. Amorphous LLTO is deposited onto high voltage LiNi 0. Next generation lithium-ion batteries will require a broad range of energies to meet the challenges of portable electronic storage from electric vehicles to microelectromechanical systems (MEMS). The cost per Watt-hour of commercial batteries have shown incremental improvement due to better manufacturing design, but drastic increases in energy and power density are needed to satisfy projected demand. 1 Solid-state electrolytes are researched heavily because they have the potential to improve capacity loss, cycle lifetime, operation temperature, and safety. Lithium Phosphorous Oxynitride (LiPON) based thin-film solid-state batteries have excellent cycle life and are currently commercialized.2,3 However, LiPON has a relatively low ionic conductivity (1 × 10 −6 S/cm) and other solid electrolytes have demonstrated conductivity several orders of magnitude higher. 4,5 Lithium lanthanum titanate (LLTO) is a promising solid-state electrolyte due to its high bulk ionic conductivity (∼10 −3 S/cm) at room temperature, negligible electronic conductivity, and high voltage, atmospheric, and temperature stabilities.6-8 Extensive fundamental studies have been carried out to demonstrate this high ionic conductivity, elucidate the crystal structure, and determine the mechanism of lithium ion conduction.9-12 However, there are fundamental impediments to the implementation of crystalline LLTO into an actual device. One key issue is that crystalline LLTO has a relatively low grain boundary ionic conductivity (<10 −5 S/cm), lowering the effective material ionic conductivity. 6 In addition, crystalline LLTO is unstable in contact with lithium metal because lithium will easily insert reducing Ti 4+ to Ti 3+ , thus increasing electronic conductivity. 13,14Fortunately, amorphous LLTO has not only been shown to overcome these barriers, the lower energy constraints of fabricating amorphous LLTO opens up numerous thin film synthesis techniques. Amorphous LLTO thin films have been synthesized by pulsed laser deposition (PLD), RF magnetron sputtering, E-beam evaporation, atomic layer deposition, chemical solution deposition and sol-gel synthesis. [15][16][17][18][19][20][21][22][23][24] Furusawa et al. demonstrated amorphous LL...

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A Fundamental Stability Study for Amorphous LiLaTiO₃Solid Electrolyte

Cited by 55 publications

References 35 publications

Preparation and properties of Li_xLa_0.5TiO₃ perovskite oxide electrolytes

Preparation and properties of Li_xLa_0.5TiO₃ perovskite oxide electrolytes

Sol–gel-processed amorphous inorganic lithium ion electrolyte thin films: sol chemistry

Amorphous Lithium Lanthanum Titanate for Solid-State Microbatteries

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A Fundamental Stability Study for Amorphous LiLaTiO3Solid Electrolyte

Cited by 55 publications

References 35 publications

Preparation and properties of LixLa0.5TiO3 perovskite oxide electrolytes

Preparation and properties of LixLa0.5TiO3 perovskite oxide electrolytes

Sol–gel-processed amorphous inorganic lithium ion electrolyte thin films: sol chemistry

Amorphous Lithium Lanthanum Titanate for Solid-State Microbatteries

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Product

Resources

About

A Fundamental Stability Study for Amorphous LiLaTiO₃Solid Electrolyte

Preparation and properties of Li_xLa_0.5TiO₃ perovskite oxide electrolytes

Preparation and properties of Li_xLa_0.5TiO₃ perovskite oxide electrolytes