Effect of sintering temperature on structure and ionic conductivity of Li7−xLa3Zr2O12−0.5x (x=0.5~0.7) ceramics

Huang, Mian; Liu, Ting; Deng, Yufeng; Geng, Hua; Shen, Yang; Lin, Yuanhua; Nan, Ce‐Wen

doi:10.1016/j.ssi.2011.10.003

Cited by 149 publications

(95 citation statements)

References 22 publications

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“…These data suggest that the formation of La 2 Zr 2 O 7 after 24 h of calcination is a result of Li loss from LLZO. A similar decomposition mechanism was observed by Huang et al [29]. The results of this study also indicate that the amount of CeO 2 decreased from 6.6 to 4.3 volume percent when the calcination time was extended from 1 to 4 h, respectively.…”

Section: Effect Of Ce On the Crystal Structure Of Llzosupporting

confidence: 90%

The Effect of 24c-site (A) Cation Substitution on the Tetragonal-Cubic Phase Transition in Li7-xLa3-xAxZr2O12 Garnet-Based Ceramic Electrolyte

Rangasamy¹,

Wolfenstine²,

Allen³

et al. 2012

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Section: Effect Of Ce On the Crystal Structure Of Llzosupporting

confidence: 90%

The Effect of 24c-site (A) Cation Substitution on the Tetragonal-Cubic Phase Transition in Li7-xLa3-xAxZr2O12 Garnet-Based Ceramic Electrolyte

Rangasamy¹,

Wolfenstine²,

Allen³

et al. 2012

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“…Clearly, modifying the particle size has a big effect on the sintering behavior of LLZO and can be used effectively to decrease the temperature at which densification occurs. These results show that it can be lowered more than 100°C than previously reported for conventional methods [3,9,16,17]. By using these 1 µm particles, we were also able to make free-standing dense films that are only one grain thick (150-200 µm).…”

Section: Resultsmentioning

confidence: 52%

“…Longer sintering times and higher sintering temperature often result in impurity phases, which can form due to lithium loss at high temperature and Al incorporation, particularly if alumina crucibles are used. Huang et al have reported that the cubic phase decomposes with formation of La 2 Zr 2 O 7 at 1250°C [17]. LaAlO 3 forms when the Al content is high and La 2 Zr 2 O 7 when the Li content is low [8].…”

mentioning

confidence: 99%

Effect of microstructure and surface impurity segregation on the electrical and electrochemical properties of dense Al-substituted Li₇La₃Zr₂O₁₂

et al. 2014

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Al-substituted Li 7 La 3 Zr 2 O 12 (LLZO) pellets with a grain size of 100-200 µm and a relative density of 94% were prepared by conventional solid-state processing at a sintering temperature of 1100° C, 130°C lower than previously reported. Morphological features and the presence of impurities were evaluated by X-ray diffraction (XRD), scanning electron microscopy (SEM) and energy dispersive x-ray spectroscopy (EDS). Femtosecond Laser Induced Breakdown Spectroscopy (LIBS) was used to visualize the distribution of impurities. The results suggest that chemical composition of the powder cover strongly affects morphology and impurity formation, and that particle size control is critical to densification. These properties, in turn, strongly affect total ionic conductivity and interfacial resistance of the sintered pellets.3

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“…This results in a rather high surface area which can explain the substantially lowered sintering temperature. We achieve through the low temperature synthesis of c-Li 6.25 [ 34,36,37 ] Energy dispersive X-ray (EDX) spectra obtained from the sintered pellet cross-sections reveal that Al 3+ is homogeneously distributed throughout sintered pellets, see Figure S3 (Supporting Information).…”

Section: Resultsmentioning

confidence: 99%

Interface‐Engineered All‐Solid‐State Li‐Ion Batteries Based on Garnet‐Type Fast Li⁺ Conductors

Broek

Afyon

Rupp

2016

Advanced Energy Materials

290

196

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with solid electrolytes. [ 3 ] Solid electrolytes offer many advantages and could enable the use of new high capacity electrode materials such as sulfur, [ 4 ] manganese, [5][6][7] and vanadate [ 8,9 ] -based cathodes which may not be stable and safe in the current Li-ion battery technology based on liquid electrolytes. [ 10 ] Furthermore, solid electrolytes have the promise to use directly metallic lithium anodes, i.e., preventing dendritic lithium growth, which enables even higher energy densities. From a practical point of view, one may also highlight that solid electrolytes have much-improved thermal operation windows resulting in a higher chemical and thermal stability, benefi ting the long-term operation and safety when compared to their liquid counterparts. This allows for safe packaging of the cell geometries and enables miniaturized cell architectures while simultaneously reducing the battery weight. [ 11,12 ] Among the oxide solid Li-ionic electrolytes, Li 7 La 3 Zr 2 O 12 (LLZO) garnets and their doped variants show one of the highest Li-ion conductivities in the range of ≈10 −4 S cm −1 at room temperature. [ 13 ] LLZO was fi rst synthesized and characterized in 2007 by Murugan et al. [ 14 ] Not until a few years later Geiger et al. [ 15 ] showed that LLZO appears in two different crystal structures, a cubic and a tetragonal one, with the cubic phase showing a Li-ion conductivity two orders of magnitude higher than the tetragonal phase. Using doping strategies, i.e., by introducing Al 3+ , Ga 3+ , Ta 5+ , Nb 5+ , etc., the high conductive cubic phase can be stabilized at room temperature by introducing vacancies into the Li sublattice of the structures. [16][17][18][19] One of the most commonly used dopants is Al 3+ , which stabilizes the cubic phase by substituting for three Li + , thereby creating two Li vacancies and resulting in the stoichiometry of Li 7−3 x Al x La 3 Zr 2 O 12 for the cubic phase.[ 20 ] Despite the promises, all-solid-state Li-ion batteries based on cubic LLZO solid electrolytes have still challenges in realizing high practical performances due to their high electrode-electrolyte interfacial resistances. For the investigations on all-solid-state batteries based on garnet-type cubic LLZO, most of the current research efforts are concentrated on the cathode material, most prominently on LiCoO 2 . [21][22][23][24][25][26][27] Reasonable electrochemical activities are so far only achieved by vacuum deposition of the cathode as thin fi lms, i.e., by pulsed laser deposition (PLD), because of the resulting good electrolyte-electrode contact. [ 25,26 ] Here, the exact chemical composition of the electrolyte-electrode interface also greatly determines the contact properties, the interfacial

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Effect of sintering temperature on structure and ionic conductivity of Li7−xLa3Zr2O12−0.5x (x=0.5~0.7) ceramics

Cited by 149 publications

References 22 publications

The Effect of 24c-site (A) Cation Substitution on the Tetragonal-Cubic Phase Transition in Li7-xLa3-xAxZr2O12 Garnet-Based Ceramic Electrolyte

The Effect of 24c-site (A) Cation Substitution on the Tetragonal-Cubic Phase Transition in Li7-xLa3-xAxZr2O12 Garnet-Based Ceramic Electrolyte

Effect of microstructure and surface impurity segregation on the electrical and electrochemical properties of dense Al-substituted Li₇La₃Zr₂O₁₂

Interface‐Engineered All‐Solid‐State Li‐Ion Batteries Based on Garnet‐Type Fast Li⁺ Conductors

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Effect of sintering temperature on structure and ionic conductivity of Li7−xLa3Zr2O12−0.5x (x=0.5~0.7) ceramics

Cited by 149 publications

References 22 publications

The Effect of 24c-site (A) Cation Substitution on the Tetragonal-Cubic Phase Transition in Li7-xLa3-xAxZr2O12 Garnet-Based Ceramic Electrolyte

The Effect of 24c-site (A) Cation Substitution on the Tetragonal-Cubic Phase Transition in Li7-xLa3-xAxZr2O12 Garnet-Based Ceramic Electrolyte

Effect of microstructure and surface impurity segregation on the electrical and electrochemical properties of dense Al-substituted Li7La3Zr2O12

Interface‐Engineered All‐Solid‐State Li‐Ion Batteries Based on Garnet‐Type Fast Li+ Conductors

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Resources

About

Effect of microstructure and surface impurity segregation on the electrical and electrochemical properties of dense Al-substituted Li₇La₃Zr₂O₁₂

Interface‐Engineered All‐Solid‐State Li‐Ion Batteries Based on Garnet‐Type Fast Li⁺ Conductors