Schnelle Lithiumionenleitung in granatartigem Li7La3Zr2O12

Murugan, Ramaswamy; Thangadurai, Venkataraman; Weppner, W.

doi:10.1002/ange.200701144

Cited by 142 publications

(106 citation statements)

References 30 publications

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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: 51%

“…A typical sintering procedure for LLZO called for covering pellets with powder of the same composition to inhibit lithium loss and then heating to 1230°C for more than 30 h [3,9]. The resulting pellets, however, were still not fully densified [16].…”

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confidence: 99%

“…In polycrystalline ceramics, large grains are desirable because they minimize the grain-boundary resistance [21,22]. Murugan [3] suggested that the total conductivity is half of the bulk value in LLZO, confirming the lower conductivity in the grain boundaries of the material. Ideally, dense materials with large grains are the best candidates for use as solid Li ion conductors.…”

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confidence: 99%

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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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Section: Resultsmentioning

confidence: 51%

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confidence: 99%

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confidence: 99%

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

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“…1)4) There are many candidates of Li-ion conductive oxides as solid electrolyte for allsolid-state Li-ion batteries, 5)8) the garnet-type oxide with a general formula of Li x A 3 B 2 O 12 with 5¯x¯7 is one of them. The garnet-type Li 7 La 3 Zr 2 O 12 , which was first reported by Murugan et al, 9) has both high Li-ion conductivity and wide electrochemical potential window. In order to improve the Li-ion conductive properties of the garnet-type Li 7 La 3 Zr 2 O 12 , a large number of studies on the chemical substitution using various cation species has been reported.…”

Section: Introductionmentioning

confidence: 96%

Li-ion conductivity and crystal structure of garnet-type Li6.5La3M1.5Ta0.5O12 (M = Hf, Sn) oxides

Hamao

Kataoka

Akimoto

2017

J. Ceram. Soc. Japan

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We investigated the Li-ion conductivity and crystal structure of the Ta-doped Li 7 La 3 M 2 O 12 (M = Hf, Sn) samples. All of the Tadoped samples exhibited a relatively high conductivity of ³10 ¹4 S cm ¹1 at room temperature, and the activation energies of Li 6.5 La 3 Hf 1.5 Ta 0.5 O 12 and Li 6.5 La 3 Sn 1.5 Ta 0.5 O 12 , which were determined from the Arrhenius plots in measured temperature range, are Ea = 0.400(6) and 0.451(1) eV, respectively. The crystal structure was analyzed by Rietveld method using powder X-ray diffraction data. From a view point of the LiO polyhedral volume in unit cell, Li 6.5 La 3 Hf 1.5 Ta 0.5 O 12 has a most suitable Li-ion environment among the Li 7 La 3 M 2 O 12 (M = Zr, Hf, Sn) compounds.

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“…In this decade, the garnet-related type Li 7 La 3 Zr 2 O 12 , which was reported by R. Murugan et al for first time, 1) has been studied from view points of the chemical stability, the conductive properties and the crystal structure in detail. In order to increase the Li-ion conductivity of the garnet-type Li 7 La 3 Zr 2 O 12 , a large number of studies on the chemical substitution using various cation species has been reported.…”

Section: Introductionmentioning

confidence: 99%

Synthesis, crystal structure and conductive properties of garnet-type lithium ion conductor Al-free Li7−xLa3Zr2−xTaxO12 (0 ≤ x ≤ 0.6)

Hamao

Kataoka

Kijima

et al. 2016

J. Ceram. Soc. Japan

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We investigated the phase formation and the conductive properties of the Al-free Li 7¹x La 3 Zr 2¹x Ta x O 12 (0¯x¯0.6) samples. The X-ray diffraction patterns of the Li 7 La 3 Zr 2 O 12 (x = 0) and Li 6.4 La 3 Zr 1.4 Ta 0.6 O 12 (x = 0.6) samples were assigned to be single phases of tetragonal (space group: I4 1 /acd) and cubic (space group: Ia-3d) structures, respectively. On the other hand, the intermediate compositional samples of Li 7¹x La 3 Zr 2¹x Ta x O 12 (0.2¯x¯0.5) showed a coexistence of both the tetragonal and cubic phases. To investigate the conductive property of the prepared samples, the Li-ion conductivity was measured in a temperature range from 253 to 313 K by AC impedance method. All of the Al-free Li 7¹x La 3 Zr 2¹x Ta x O 12 (0¯x¯0.6) samples exhibited relatively high conductivity of ³10 ¹4 S cm ¹1 at room temperature, and the Li 6.5 La 3 Zr 1.5 Ta 0.5 O 12 (x = 0.5) sample showed the highest Li-ion conductivity of 8.4 © 10 ¹4 S cm ¹1 at room temperature. In order to clarify the relationship between the Li-ion conductivity and the Li-ion arrangement, the crystal structure analysis of Li 7¹x La 3 Zr 2¹x Ta x O 12 (0¯x¯0.6) was performed by Rietveld analysis using powder X-ray diffraction data. The Li(2) atom at 96h site was gradually shifted together with increasing Ta-content from x = 0.2 to 0.5 resulting the shorter LiLi distance in the loop structure of the cubic garnet-type framework structure.

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Schnelle Lithiumionenleitung in granatartigem Li₇La₃Zr₂O₁₂

Cited by 142 publications

References 30 publications

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

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

Li-ion conductivity and crystal structure of garnet-type Li<sub>6.5</sub>La<sub>3</sub><i>M</i><sub>1.5</sub>Ta<sub>0.5</sub>O<sub>12</sub> (<i>M</i> = Hf, Sn) oxides

Synthesis, crystal structure and conductive properties of garnet-type lithium ion conductor Al-free Li<sub>7−</sub><i><sub>x</sub></i>La<sub>3</sub>Zr<sub>2−</sub><i><sub>x</sub></i>Ta<i><sub>x</sub></i>O<sub>12</sub> (0 ≤ <i>x</i> ≤ 0.6)

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Schnelle Lithiumionenleitung in granatartigem Li7La3Zr2O12

Cited by 142 publications

References 30 publications

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

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

Li-ion conductivity and crystal structure of garnet-type Li<sub>6.5</sub>La<sub>3</sub><i>M</i><sub>1.5</sub>Ta<sub>0.5</sub>O<sub>12</sub> (<i>M</i> = Hf, Sn) oxides

Synthesis, crystal structure and conductive properties of garnet-type lithium ion conductor Al-free Li<sub>7&minus;</sub><i><sub>x</sub></i>La<sub>3</sub>Zr<sub>2&minus;</sub><i><sub>x</sub></i>Ta<i><sub>x</sub></i>O<sub>12</sub> (0 &le; <i>x</i> &le; 0.6)

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Schnelle Lithiumionenleitung in granatartigem Li₇La₃Zr₂O₁₂

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

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

Synthesis, crystal structure and conductive properties of garnet-type lithium ion conductor Al-free Li<sub>7−</sub><i><sub>x</sub></i>La<sub>3</sub>Zr<sub>2−</sub><i><sub>x</sub></i>Ta<i><sub>x</sub></i>O<sub>12</sub> (0 ≤ <i>x</i> ≤ 0.6)